Home

470 User Manual issue 1 - Eurotherm by Schneider Electric

1. eee 6 15 Powerline trente Deren cei eee neben ie ci EG 6 16 Checks in the event of abnormal operation 6 17 470 User Manual 61 Commissioning Chapter 6 COMMISSIONING PROCEDURE Read this chapter carefully before commissioning the thyristor unit COMMISSIONING PROCEDURE SAFETY A Important Eurotherm cannot be held responsible for any damage to persons or property or for any financial loss or costs resulting from the incorrect use of the product or the failure to observe the instructions contained in this manual It is therefore the user s responsibility to ensure that all the nominal values of the power unit are compatible with the conditions of use and installation before commissioning the unit Warning Never use a thyristor unit with a power supply voltage greater than the nominal voltage of the thyristor unit as specified in the coding Dangerous live parts can be accessible when the unit is dismounted from its backplate Access to internal components of the thyristor unit is prohibited to users who are not authorised to work in industrial low voltage electrical environments The temperature of the heatsink can be greater than 100 C Avoid any contact with the heatsink even momentarily when the thyristor unit is operating The heatsink remains hot for approximately 15 min after the unit has been switched off 470 User Manual Commissioning
2. Table 6 8 Assignment of the positions of the EUROTHERM type 260 diagnostic unit Right diagnostic socket In positions 1R 2R 3R and 6R the RMS values can be measured with an external voltmeter connected to the oscilloscope terminals of the diagnostic unit 68 470 User Manual Commissioning CALIBRATION When it leaves the factory the thyristor unit is set for the nominal voltage and the nominal load current determined by the corresponding codes In this condition the nominal power corresponds to 100 of the feedback signal the true power image available at terminal 36 of the driver terminal block or in position 5R of the diagnostic unit is 10 V For the real application the dissipated power in the load can be different to the nominal power power supply voltage slightly different to that of the thyristor unit nominal load current different to the nominal current of the thyristor unit specified in the unit order tolerance of installation components In this case the feedback and the retransmission signal do not correspond to the true power value To calibrate the thyristor unit to operating conditions the user can adjust the feedback values and the power image using the calibration potentiometer labelled P Adjust P R gl on the front panel of the thyristor unit The value retransmitted at terminal 36 of the driver board terminal block or in position 5R of the diagnostic unit connected to the Right conn
3. esee 5 13 Load voltage image seee 5 13 True power image eeeeeeeeeenmeeenneennnen 5 13 Inhibit and safety QUENCH seen 5 14 470 User Manual 51 Wiring Chapter 3 WIRING Contents Safety during wiring Fixing the power cables sesm User terminal blocks Auxiliary power SUDDIY 3 5 notet e een estie Das Alarm relay contact ssessseeeemn Load voltage information eene Control cables Fixing Connecting the shield to the ground ssss Control terminal block cesses Driver terminal block Input signals Safety quench Inhibit External control connection seeeeeeseeeeeeeeeeeeennnnnnnnn e Control of multiple thyristor units ssssss Parallel input connection eseese Serial input connection seseseeeeees Manual control connection eeeene Current limit connection optional esssss Limit set using the potentiometer on the front panel Limit set using an external voltage Limit set using an external potentiometer Power limit connection sseeeeen Limit set using the potentiometer on the front
4. 24V pulses 15 V electronics supply 15 V 150mV Oscillator input 1 2 V 6 4 Vpeak 90 pulses 1 2 V 6 4 Vpeak 90 pulses 15 V electronics supply 15 V 150mV 0 voltage crossing pulse 10 5 V 12 Vpeak 0 6ms Electronics supply 0 V OV Saw tooth generator 3 6 V 8 4 Vpeak 100 Hz Table 6 1 Enable Left diagnostic socket All models 10 V Assignment of the positions of the EUROTHERM type 260 diagnostic unit 470 User Manual Commissioning Position Burst mode and single cycle firing Assignment Current image full wave rectified 0 of setpoint 50 of setpoint Modulation 0 2 5 V 100 of setpoint Manual input if used 2 5V PLF output not in alarm In the alarm state 13 5 V 12 6 V External setpoint Example 0 5 V 2 5 V Threshold current limit optional 0to 10V Current image for PLF detection Modulation Oto 4 6 V Load voltage image Modulation 0 to 4 3 V Control setpoint 2 5 V Not used Firing demand 0 Vmean 1Vpeak Modulation 12 5 V peak 10V reference 10 V 0 1 V Auxiliary supply image 24 V full wave rectified Pulse output 24 V pulses 15 V electronics supply 15 V 150mV Oscillator input 6 4 Vpeak 15 V electronics supply 15 V 150mV 0 voltage c
5. CHECKING THE CHARACTERISTICS Caution N Before switching on the unit make sure that the identification code of the thyristor unit corresponds to the coding specified in the order and that the characteristics of the thyristor unit are compatible with the installation Load current The maximum load current must be less than or equal to the value of the nominal current of the thyristor unit taking the load component tolerance and power supply 10 variations into account Power supply voltage The nominal value of the thyristor unit voltage must be greater than or equal to the voltage of the power supply used Caution Given the inhibit at 70 96 of the nominal voltage the nominal voltage of the thyristor unit must be as close as possible to the nominal power supply voltage Auxiliary supply voltage The auxiliary supply voltage must be in phase with the power voltage It is adapted by the position of the soldered links and the choice of the transformers This selection is made in the factory depending on the auxiliary supply voltage code Input signals The configuration of the mini switches on the control board must be compatible with the selected control signal level see Configuration chapter Partial load failure detection The voltage used for the PLF detection circuit is that used for the auxiliary power supply This voltage must thus correspond to the power voltage The PLF alarm relay contact must
6. Figure 2 2 Dimensions for attachment to a vertical wall mm To mount the unit e tilt the unit forwards to approximately 20 degrees from the horizontal fit the rotation pin into the slot in the backplate raise the unit to the horizontal lock by a quarter of a turn To dismount the unit unlock the upper attachment by a quarter of a turn tilt the unit forwards to approximately 20 degrees from the horizontal free the unit from its backplate Warning Before dismounting the unit ensure that it is switched off and that AN the heatsink is not hot Before dismounting the backplate ensure that it is isolated from the power supply 470 User Manual Operation Chapter 5 OPERATION Contents page Thyristor firing modes 5 2 Generali t MM ier 5 2 Phase angle mode esseseseeeseeeeeeene 5 2 Burst firing mode inerenti ines 5 3 Single Cycle mode ssseeseeeeese 5 3 Modulation time Soft start end isi Hee deed Over current elimination for the inductive load 5 6 Control cei de e ede eesti a ieee 5 7 Control UNCION sii ca e ER Pe DRE 5 7 Pulse gatlig aeree reete 5 9 Power Imt uicit et deleniti a edebat 5 10 Current limit optional esee 5 11 Partial load failure detection eeseeeeeessss 5 12 Retransmission s eio pee ede PEE RCeE De Teeets 5 13 Load current image
7. ssse 7 3 Replacement of the internal high speed fuse 7 4 Auxiliary power supply protection fuses ssssssssse 7 4 SEMVICING se E ree ren ec A i o aa asari 7 5 TOOlS i teenth the ayes ath tise ER ERREUR 7 6 Cont4 470 User Manual Identification Chapter 1 IDENTIFYING THE THYRISTOR UNITS Contents page General introduction to the 470 series 1 2 Technical data sssseeeeeeseeeseeeeeeneennnn e 1 6 POW T A aider feci eh i criado aeta fue oni 1 6 Environment eie ea ert dra hi o ree ER ER s 1 6 lere ele es See ee 1 7 Retransmissions cccccccceeecceeesssseceeeeeeeeeeeaeeesseees 1 8 G urrentlilmit s 1er coe cocto ve et e a en eek ot 1 8 POWERING ertet sta No S CS se uc ta 1 8 Partial load failure detection ss 1 8 Thyristor unit coding ee 1 9 Backplate ois rete he renes 1 10 Short or full code rette 1 10 Coding example sse 1 11 470 series thyristor unit and installation parameters eeeeeeeees 1 11 Thyristor unit coding eeeeen 1 11 Serial number labels seen 1 12 470 User Manual H Identification Chapter 1 IDENTIFYING THE THYRISTOR UNITS GENERAL INTRODUCTION TO THE 470 SERIES The 470 series power thyristor units are true power controllers of single
8. Thyristor Power units and Driver units 470 series Single phase resistive and inductive load true power control User Manua Copyright Eurotherm Automation 1996 All rights reserved All reproduction or transmission in any form or using any procedure electronic or mechanical including photocopying and recording without the written permission of EUROTHERM AUTOMATION is strictly prohibited EUROTHERM AUTOMATION have taken particular care to ensure the accuracy of these specifications However in order to maintain our technological lead we are dedicated to the continual improvement of our products and this may lead to modifications or omissions in the current specifications We cannot be held responsible for any material or bodily damage losses or costs incurred Printed in France 05 96 HA 175076 Issue 1 The installation configuration commissioning and maintenance of the power unit must only be performed by a person qualified and authorised to perform work in an industrial low voltage electrical environment Important precautions and special information are indicated in the manual by two symbols AN This symbol means that failure to take note of the information may have serious consequences for the WARNING safety of personnel and may even result in the risk of electrocution This symbol means that failure to take note of the A N information may CAUTION have serious consequences for the installation result in the
9. fast cycle modulation time 0 8 s at 50 setpoint burst firing fast or slow with soft start in thyristor firing angle variation burst firing fast or slow with soft start and end in thyristor firing angle variation The front panel comprises the following the partial load failure detection setting potentiometer the Test push button to test the partial load failure alarm setting theindicator light to display the partial load failure detection the current limit setting potentiometer optional the indicator to display an internal thyristor protection fuse blow out 470 and 471 models the sockets left and right for diagnostics the power limit setting potentiometer the calibration potentiometer The 471 model thyristor units are equipped with a fan 100 A to 150 A nominal Thermal protection is provided by a thermal switch which detects if the fan has stopped or the heatsink is overheated and inhibits thyristor unit firing The 470 thyristor unit is equipped with an active operation inhibit An external 10 V voltage 32 V max or a contact connected to the control terminal block is used to inhibit the thyristor unit The 470 series thyristor units can be plugged into the mounting backplate 470 User Manual 15 Identification TECHNICAL DATA The 470 series power thyristor units are designed to control the true power of an industral single phase load with a high current requirement at start
10. 2 V and 1 V 344 470 User Manual Wiring External control connection The external signal is applied to terminals 5 and 6 of the control terminal block e on terminal 5 External control signal Safety quench 100 power limit Figure 3 8 External control signal connection For normal operation of the 470 series thyristor unit with the external control e disconnect the Inhibit input terminal 16 from the 10 V voltage terminal 12 terminal 14 Current limit option should be connected to terminal 12 10 V e the Manual input terminal 4 should be connected to terminal 6 0 V e the Power limit input terminal 35 should be connected to terminal 12 10 V short circuit terminals 21 and 22 Safety quench 470 User Manual 315 Wiring Control of multiple thyristor units If multiple thyristor units are controlled by the same controller the inputs can be connected in parallel or in series All the thyristor units must be configured for the same thyristor firing mode and for the same input signal Parallel input connection The inputs must be configured for voltage The input impedance for each thyristor unit is 50 kQ The current required for each thyristor unit is 0 2 mA at full scale External control signal 0 0 1 1 O1 00 lt lt lt Figure 3 9 Parallel input connection Serial input connection The inputs must
11. Load voltage Power supply voltage Resistive load Power supply voltage Load voltage Inductive load Figure 5 1 Phase angle firing mode 5 2 470 User Manual Operation Burst firing mode The Burst firing mode is a proportional cycle which consists of supplying a series of complete power supply voltage cycles to the load Thyristor firing and non firing are synchronised with the power supply and are performed at zero voltage for a resistive load This firing eliminates the steep fronts of the power supply voltage applied to the load does not produce interference on the supply and in particular prevents the generation of parasites In the Burst firing thyristor firing mode the power supplied to the load depends on firing times T and non firing times Typ The load power is proportional to the firing rate t and is defined by the ratio of the thyristor firing time Ty and the modulation time T4 T Ty The firing rate or cyclic ratio is expressed by the following ratio T T Typ The load power can be expressed by P t Pax where P represents the load power during thyristor firing MAX Load voltage 0 lt TF gt lt TNF gt lt TM gt Figure 5 2 Firing times of a burst firing cycle Single cycle mode The Burst firing mode with a single firing or non firing time is called the Single cycle mode 470 User Manual 58 Oper
12. and 12 10 V should be connected Terminals 21 and 22 Safety quench should be connected 470 User Manual 317 Wiring Current limit connection optional The 470 series thyristor units have the threshold current limit as an option The current limit is only available in the Phase angle and Burst firing with soft start firing modes The threshold current limit is a function which is used to limit the load current to a specified value independently from the input signal The current limit controls the squared RMS load current D The current limit can be used with an external or manual control The current limit threshold can be set by the potentiometer marked I limit Limit I on the front panel by an external voltage in cascade with the potentiometer on the front panel by an external potentiometer in cascade with the potentiometer on the front panel Limit set using the potentiometer on the front panel The T limit Limit I potentiometer on the front panel is powered by the 10 V internal voltage terminal 14 on the control terminal block should be connected to terminal 12 If the I limit Limit I potentiometer is turned completely clockwise the current value is limited to 110 of the nominal thyristor unit current value When this potentiometer is turned anti clockwise the maximum current falls to 0 Caution If the adjustable limit is not used in the Current limit option it i
13. 230 V Nominal current Code Options Code 470model 15A 25A 40A available in Phase angle 55A and soft start 75 A 471 model 100 A Frequency 60 Hz 125 A PLF alarm contact 150A closed in alarm state 472 model external thyristors No backplate True power Current limit 470 User Manual 19 Identification Backplate Thyristor unit model Nominal current Backplate code 00 For advance installation order the mounting backplate without a unit Thyristor Nominal Backplate unit model current code 15Ato75 A LA 171569 100 A to 150A LA 171570 External thyristors LA 171615 For deferred orders of units with no backplates pre installed backplates use the thyristor unit coding option No backplate code 76 Short or full code The full code for the 470 series thyristor units shown on page 1 9 in Coding specifies all the technical characteristics selected by the client To simplify the process for ordering thyristor units the short code can be used specifying the model the nominal current and the operating voltage The short code is presented as follows Model Nominal Nominal Auxiliary supply 00 current voltage voltage If the short code is used the 470 thyristor unit is supplied with the standard configuration the input configured for 4 20 mA the thyristor firing mode firing angle variation Phase an
14. IN power measured could be negative and cause the control to malfunction To Neutral or Line 2 1 A fuses To Line 1 Figure 3 3 Load voltage connection example for 470 and 471 models 38 470 User Manual Wiring CONTROL CABLES Caution The control connections must be made with shielded cables connected to earth at both A N ends in order to ensure satisfactory immunity against interference Separate the control cables from the power cables in the cable trays Fixing The control wires must be grouped together in a shielded cable passing through the cable clamp under the unit to the left of the power terminal block Backplate Cable tightening screw with shield Stirrup Control cable M clamp seen from Control cable Driver cable below clamp clamp Figure 3 4 Control cable clamp location Important To facilitate the earthing of the cable shield and to ensure maximum immunity against electromagnetic interference the metal cable clamp is fixed directly to the ground of the unit 470 User Manual 39 Wiring Connecting the shield to the ground To insert the control cable and ground its shield Strip the shielded cable as shown in figur
15. Maintenance THYRISTOR PROTECTION FUSE The 470 and 471 model thyristor units are supplied with the internal fuse up to 125 A with fuse blown indicator light For the 150 Anominal current 471 model the external fuse must be ordered separately Caution A N The high speed fuse is only used for the internal protection of the thyristors against wide amplitude over loads Table 7 1 contains all the part numbers of the original internal fuses as fitted in the factory and the fuses which are authorised for replacement during maintenance IN Caution The use of other fuses invalidates the thyristor unit guarantee Nom current 75 A Internal fuse Max voltage Part Numbers Eurotherm CH 120114 Sup pliers Ferraz B 099959 LR EE 1000 110 Brush 110 EET GSG1000 110 125A Internal fuse CH 120154 C 099960 EE 1000 150 150 EET GSG1000 150 150A External fuse CH 340025 H 300019 150A Fuse holder CP 171482 V 98711 External thyristor block Protection of external thyristors according to thyristor block supplier recommendations Table 7 1 Recommended high speed fuses for thyristor protection 470 User Manual Maintenance REPLACEMENT OF THE INTERNAL HIGH SPEED FUSE The 470 and 471 model power thyristor units nominal current from 15 to 125 A are fitted with internal high speed fuses These fuses are
16. User Manual 323 Wiring External thyristor block control 472 model To control the external thyristor unit the driver terminal block of the electronic driver unit 472 model is equipped with thyristor firing signal outputs aload current measurement signal input A load voltage measurement signal input is located on the user terminal block see page 3 5 The thyristor firing signals are available on terminals 23 24 and 26 27 Terminals 23 and 24 should be connected to the cathode and gate respectively of the external thyristor T1 connected in the order Line Load Terminals 26 and 27 should be connected to the cathode and gate respectively of the external thyristor T2 connected in the order Load Line Caution Do not invert the Cathode Gate wires of thyristors T1 and T2 a PLF alarm is activated since the thyristors cannot output The 472 driver unit should be at most 80 cm from the thyristor block Twist each pair of Cathode Gate wires The twisted wires should not be placed near the power cables Terminals 38 and 39 are to be used for the secondary coil connection of the external current transformer nominal current 5 A Warning The current transformer should ensure dual isolation between the primary and secondary coils This isolation should be calculated with reference to the operating voltage thyristor block supply voltage IN Caution The order of connection of the
17. an ammeter measure the RMS current and check that the load current does not pass On the external input terminal 4 or manual input terminal 5 apply a signal corresponding to 100 of the control signal Using an ammeter measure the RMS current and check that the current is equal to the nominal load current Resistive load with high resistance variations For loads with high temperature coefficients use the Phase angle thyristor firing mode or the soft start with the Current limit option For the soft start the ramp is set to approximately 300 ms the ramp setting potentiometer P4 has no effect 470 User Manual 611 Commissioning Non saturating inductive load When the load has an inductive component a 50 Hz inductor for example firing at zero voltage in the Burst firing or Single cycle firing modes generates transient operation which produces an over current and in some cases can cause the thyristor protection fuse to blow see Operation To avoid these over currents at the start of each burst the first firing of the thyristors must be delayed in relation to the corresponding zero voltage Phase angle firing mode can also be used The optimum delay angle 90 max must be adjusted with potentiometer P4 depending on the load used The delayed thyristor firing only affects the first firing in each burst To set for a non saturating inductive load Turn potentiometer P4 completely clockwise maximum
18. applications the gate pulses on the polarised thyristor in inverse mode can lead to operating problems firing instability fuse blow out It is therefore necessary to eliminate the gate pulses when the thyristor is polarised in inverse mode This function is performed by the pulse gating circuit available for 470 thyristor units This pulse gating is essential for configurations in which multiple thyristor units are distributed between the phases of a three phase power supply and have an electrical configuration which could induce a phase shift between the voltage applied to the thyristor and the electronic supply voltage For example control of heating electrodes in transformer secondary coil immersed in the same molten glass bath load in star with neutral with the central point of the star connected to the power supply neutral by a wire of a non negligible resistance with reference to that of the load 470 User Manual 50 Operation POWER LIMIT Using the load current and voltage measurement the 470 series thyristor units can use a threshold limit of the controlled parameter true power squared RMS load current or RMS load voltage The Power limit function limits the controlled parameter to a specified value independently from the input signal The maximum threshold of the dissipated power in the load or the threshold of the parameters V and P proportional to a power for the constant resistance is set u
19. at least 50 cm from the 472 unit Caution The units are designed to be used at an ambient temperature less than or equal to 50 C Excessive overheating may cause incorrect operation of the unit which in turn may cause damage in the components 471 series power thyristor units have permanent fan cooling 2 470 User Manual Installation DIMENSIONS The dimensions of the 470 series thyristor units are given in figure 2 1 and table 2 1 A Fail Lh oa Adjust 3 j Seuil e P Limit Test P Limit 1 limit P Adjust Limit P R gl Fuse fail H D f fusible 240V 75A E MM cJ m 1 Ww gt lt D Side view Front view Figure 2 1 Overall dimensions Height H Width W Depth D Weight mm mm mm kg 470 249 170 236 3 5 471 282 170 236 5 472 249 115 236 25 Table 2 1 Overall dimensions and weight 470 User Manual Installation MECHANICAL MOUNTING 470 series units are plugged into a steel backplate located at the rear of the unit The backplate can be mounted on a pair of asymmetric DIN rails on a vertical wall Backplate Quarter turn locking PN 56 47 for 472 Y A 178 105 Y Y T xu Em 2 DIN 20 rails Rotation y pin 4 holes diam 4 8 2 holes for 472 88 470 121 471 94 472
20. be configured for current The input impedance when configured for 0 10 mA or 0 5 mA is 1 kO For 0 20 mA and 4 20 mA inputs the input impedance is 250 Q At full scale a voltage of 5 V is needed for each thyristor unit for the 0 20 mA and 4 20 mA inputs 10 Wor the 0 10 mA or 0 5 mA input External control signal 0 5 mA 0 10 mA 0 20 mA 4 20 mA Figure 3 10 Serial input connection 316 470 User Manual Wiring Manual control connection The 470 series unit can be controlled by an external potentiometer manual control For manual control the external potentiometer should be connected between terminals 6 0 V and 12 10 V The wiper is connected to terminal 4 Manual input The potentiometers used are from 4 5 kO to 10 kO For manual control the 470 series unit should be configured for voltage p o i oO o gt o ty o 4 7k to10k potentiometer Inhibit T A o 5 4 a Enable xX eo e Figure 3 11 470 thyristor unit manual input If manual control is used terminal 5 of the external input must be connected to 0 V Caution N If the input signal is connected to terminal 5 the two signals external and manual are added together The inhibit circuit should be open terminal 16 is not connected to terminal 12 Terminals 14 Current limit option 35 Power limit
21. button should place the thyristor unit in the alarm state if the setting has been performed correctly Reminder The PLF detection circuit does not use the load voltage directly but recreates it electronically using the auxiliary supply voltage 614 470 User Manual Commissioning CURRENT LIMIT SETTING OPTIONAL The current limit can be adjusted using the T limit Limit I potentiometer on the front panel Make sure that the load is connected When the threshold current limit is used in cascade with an external potentiometer or signal make sure first of all that the Threshold limit setpoint 10 V in position 5L of the diagnostic unit is at the maximum value Turn the I limit Limit I current limit potentiometer completely anti clockwise minimum current Apply a 0 V signal to terminal 14 and connect the power voltage The RMS voltage at the load terminals must be zero e Increase the current limit input signal to 100 I limit Limit I potentiometer still turned completely anti clockwise The load voltage should not increase Turn the TT limit Limit I potentiometer gradually clockwise and check that the current rises slowly Set the T limit Limit I potentiometer in order to obtain the maximum current permitted by the load Ty ry Caution For the current limit setting only use an ammeter which gives the True RMS value to A N measure the load current in order to prevent risks
22. current transformer Figure 3 18 Example of 472 driver unit connection line to line wiring 328 470 User Manual Configuration Chapter 4 CONFIGURATION Contents page Safety during configuration eesseeseese 4 2 Location of the configuration equipment 4 3 Configuration of the control board eessessse 4 6 Input ype ieri ien dened alana alee 4 6 Automatic input external signal sss 4 6 Manual input nti tet reni ipa 4 6 Thyristor firing mode eem 4 7 Frequerngy eiii eee 4 7 Configuration of the driver board 4 8 470 User Manual 4 Configuration Chapter 4 CONFIGURATION SAFETY DURING CONFIGURATION The thyristor unit is configured using mini switches and mobile jumpers located on the control board Important The unit is supplied fully configured in accordance with the code on the identification label This chapter is included in order to check that the configuration is compatible with the application or modify if necessary certain characteristics of the thyristor unit on site Warning For safety reasons the reconfiguration of the thyristor unit using jumpers must be performed with the unit switched off by qualified personnel Before starting the reconfiguration procedure check that the thyristor unit is isolated and that an occasi
23. eS Re Re RK KOO Cc coocococo Table 4 1 Configuration of the automatic input Manual input The manual input voltage range external potentiometer wiper at terminal 4 depends on the configuration of the automatic input Table 4 2 gives the manual input voltage range as a function of the limit positions of the potentiometer Position of mini switches Voltage range at manual input 1 2 0 0 5 V 0 10 V 1 25 V 6 25 V Table 4 2 Configuration of the manual input In position 8L of the diagnostic unit left socket 100 control corresponds to 5 V 4 6 470 User Manual Configuration Thyristor firing mode The thyristor firing modes can be configured using mini switches 5 to 7 strip SW1 and by two jumpers J1 and J2 located on the control board Thyristor Position firing mode SW1 mini switches Jumpers J1 Firing angle variation Single cycle Fast cycle Slow cycle Fast cycle with soft start Slow cycle with soft start Fast cycle with soft start and end Slow cycle with soft start and end Table 4 3 Configuration of the firing mode Note Ifthe jumper J1 is in position 1 in Phase angle the response time on setpoint variation is multiplied by 10 e intable 4 3 indicates that the jumper position is irrelevant Frequency The frequency used is configured using mini switch 8 strip SW1 Frequency Position of mini swit
24. external current transformer must be observed Otherwise the output power could be negative and induce a control malfunction 324 470 User Manual Wiring Load voltage input Safety quench External T1 Cathode control 2 T2 Cathode T2 Gate Backplate 10 V To terminal S1 S2 Load current input To external thyristor T1 To external thyristor T2 To secondary coil of external current transformer Figure 3 16 External thyristor block control connection 472 model For the full wiring diagram of the 472 driver unit for power the external thyristor block and the external current transformer see page 3 28 470 User Manual 325 Wiring EXAMPLES OF WIRING DIAGRAMS The figures below give examples of full wiring diagrams for power the auxiliary supply and external control for the two 470 series model types the 470 and 471 models with internal thyristors and incorporated measurement circuits the 472 model with an external thyristor block and external current transformer The connection details for the power limit current limit and different types of control are explained in the previous paragraphs For the specific features of the auxiliary power supply connection according to the power supply voltage used see page 3 6 470 and 471 model thyristor units The load current passes t
25. incorrect functioning of the power unit These marks must indicate specific points The entire manual remains applicable It is the responsibility of the user and it is highly recommended given the value of the equipment controlled using 470 to install independent safety devices This alarm must be tested regularly Eurotherm can supply suitable equipment As a result of the constant improvement of its products Eurotherm may modify these specifications without warning For any further information and if in doubt please contact your EUROTHERM office where technicians are at your disposal should you require advice or assistance with the commissioning of your installation Printed in France 05 96 HA 175076 Issue 1 EUROPEAN DIRECTIVES ELECTROMAGNETIC COMPATIBILITY EMC For industrial environments excluding residential environments The 470 products are considered as components without any direct function as defined in the EMC Directive The system or installation in which these products are incorporated must complies with the essential protection requirements of the EMC Directive However Eurotherm certifies that the 470 products when installed and used in accordance with their User Manual meets the following test standards and enables the system or installation in which there are installed to comply with the EMC Directive in regards to the 470 products Test standards Edition Immunity Electrostatic discharge IEC
26. mounted at the rear of the plug in unit If the internal fuse blows a red indicator light on the front panel of the unit lights up To replace the internal fuse unplug the unit from its backplate loosen the two fuse attachment screws see figure 4 1 fit the appropriate fuse the part numbers are given in table 7 1 Tightening 3 5 N m Caution A The thyristor unit may be damaged if tightening is not performed correctly For the 150 A nominal current 471 model the high speed fuse and its holder are external AUXILIARY POWER SUPPLY PROTECTION FUSES These fuses should be installed in the cables which connect the auxiliary power supply voltage see Wiring chapter Auxiliary voltage max 1 A fuse 6 3 x 32 mm CS174289U1A0 Fuse and fuse holder assembly CP174293 Fuse and fuse holder assembly dimensions mm 63 x 15 x 52 Table 7 2 Recommended fuse for protection of the auxiliary power supply connection 7 4 470 User Manual Maintenance SERVICING The 470 series thyristor units must be mounted with the heatsink vertical with no obstructions above or below which could reduce or hinder the air flow Caution If several units are fitted in the same cabinet arrange them so that the A N air from one unit is not taken in by the unit placed above it For correct cooling of the unit it is recommended that the heatsink and the fan protection mesh be clean
27. of errors which may reach 50 and make sure that the setpoint is 100 The threshold current limit can be pre set when a thyristor unit is switched on but not firing The value of the squared RMS load current is proportional to the Threshold current limit setpoint observed at position 5L of the diagnostic unit The current limit voltage V sy can be calculated using the following equation 2 ILIM VsL V 826 V 2 INOM Current limit signal position 5L of the diagnostic unit Table 6 6 Example of the threshold current limit 470 User Manual 615 Commissioning POWER LIMIT The power limit of the controlled parameter can be adjusted using the P limit potentiometer on the front panel Make sure that the load is connected Turn the P limit potentiometer completely clockwise Set the external or manual control signal to zero Connect the thyristor unit supply voltage Check that the thyristors are not outputting with an ammeter or with the diagnostic unit displaying the load current and voltage images as zero Adjust the current limit to 100 Adjust the power limit setpoint to 20 1 V in position 7R of the diagnostic unit connected to the Right socket Gradually increase the control signal to 100 and check that the thyristors output the current The power image should correspond to 20 of the calibrated value 2 V in diagnostic position 5R For each load the voltage of the requ
28. on the control board terminal block terminal 4 or 5 the signal polarity is correct negative voltage in position 8L and that the control wires are correctly inserted in the screw connection system 1 8 Check that the input signal type and level are compatible with the type and level of the configured signal 1 9 Check the wiring of the thermal switches 471 and 472 models 1 10 Check the presence of the thyristor firing pulses diagnostic position 13L for the 470 and 471 models position 17R for the 472 model 1 11 Check that the current limit is not at zero diagnostic positions 5L and 4R 1 12 Check that the power supply voltage is greater than or equal to 70 Jof the thyristor unit nominal voltage 1 13 Check that the Gate Cathode wires are not inverted 472 model 470 User Manual 617 Commissioning Symptom 2 The transient over current when starting up an inductive load is too high Burst mode or Single cycle firing 3 The thyristor is in full firing with an input signal at zero 4 The thyristor unit remains in partial firing after the input signal has been applied and set to zero power control only Action 2 1 Check that the load wiring is correct 2 2 The factory pre setting of potentiometer P4 of the delayed firing angle is 0 Increase this angle by turning potentiometer P4 clockwise 3 1 Check the configuration of the input signal and the controlled parameter and that the
29. on the label 1 12 470 User Manual Installation Chapter 2 INSTALLATION Contents page Safety during installation ssseessssss 2 2 Dimensions omit E E Tro Sede edits 2 3 Mechanical mounting eeeeeene 2 4 470 User Manual Installation Chapter 2 INSTALLATION SAFETY DURING INSTALLATION Warning AN 470 units must be installed by a person authorised to work in an industrial low voltage electrical environment Units must be installed in bulkhead mountings in fan cooled electric cabinets guaranteeing the absence of condensation and pollution The cabinet must be closed and connected to the safety ground in accordance with the standards NFC 15 100 IEC 364 or the current national standards For installations in fan cooled cabinets it is recommended to place a fan failure detection device or a thermal safety control in the cabinet The units must be mounted with the heatsink positioned vertically and with no obstructions either above or below which could block the passage of the ventilation air If multiple units are installed in the same cabinet they should be arranged in such a way that the air from one unit cannot be admitted into the unit located above it Leave a vertical gap of at least 80 mm between two units Leave a gap of at least 20 mm between two units installed side by side The external thyristors controlled by a 472 driver unit must be
30. phase industrial electrical loads The 470 series is designed for the true power control of inductive and transformer connected loads transformer primary circuits in particular or high or low temperature coefficient resistive loads The 470 series is composed of three models 470 power thyristor unit with incorporated thyristors nominal current 15 A to 75 A natural convection cooling 471 power thyristor unit with incorporated thyristors nominal current 100 A to 150 A fan cooling 472 external thyristor driver unit nominal current of driven thyristor block up to 4000 A external current transformer secondary current 5A nominal The nominal line to line voltage is 100 V to 500 V The control signal which can be reconfigured by the user can have one of three voltage levels 0 5 V 0 10 V and 1 5 V or one of four current levels 0 5 mA 0 10 mA 0 20 mA and 4 20 mA Manual control using external potentiometers is possible Three load parameters can be controlled true power P squared RMS voltage V or squared RMS current P The 470 series thyristor units are equipped with the following functions different thyristor firing modes decrease in the current requirements of high temperature coefficient loads using current limits and soft starts elimination of over currents when starting non saturating inductive and transformer connected loads current limit optional and controlled par
31. power limit threshold can be set in the following ways by the P Limit potentiometer on the front panel by an external voltage in cascade with the P Limit potentiometer by an external potentiometer in cascade with the P Limit potentiometer Power limit set using the potentiometer on the front panel For the load power threshold limit using the P Limit potentiometer terminal 35 Power limit input on the driver terminal block should be connected to terminal 12 10 V on the control terminal block The maximum power limit varies between 046 when the P Limit potentiometer is turned completely anti clockwise and 100 when the potentiometer on the front panel is turned completely clockwise 470 User Manual 321 Wiring Limit set using an external potentiometer The threshold power limit can be set using an external potentiometer A 10 KQ external setting potentiometer should be connected between terminals 6 0 V and 12 10 V on the control terminal block The potentiometer wiper should be connected to terminal 35 Power limit input on the driver terminal block Safety quench External signal 10k potentiometer 10 V Figure 3 14 External potentiometer connection for the power limit The power limit threshold setting using an external potentiometer reacts in cascade with the P Limit pot
32. signal is really absent from terminals 4 and 5 of the control terminal block 3 2 By disconnecting the 4 Gate Cathode wires 472 model and isolating the connection lugs check that the thyristors are not short circuited For the 470 and 471 models use an ohmmeter to check that the thyristors are not short circuited after disconnecting the unit 3 3 Check that the electronics supply voltage is connected correctly and is in phase with the power 4 1 Check the polarity of the power indications diagnostic positions 5R and 9R If these indications are negative one of the 2 measurements load current or voltage is inverted and the thyristor unit measures a negative power Check that the load voltage information connection terminals 61 and 63 is correct For the 472 model check the polarity of the connection of terminals 38 and 39 external thyristor current measurement Note the voltage of the 40 diagnostic positions at the 0 and 100 setpoint this often indicates the cause of the failure If the fault persists after all these checks contact your nearest EUROTHERM office where technicians will be able to advise you and assist you during commissioning 618 470 User Manual Maintenance Chapter 7 MAINTENANCE Contents Thyristor protection essent Thyristor protection fuse Replacement of the internal high speed fuse 7 4 Auxiliary power supply pro
33. terminal block The potentiometer wiper should be connected to terminal 14 Current limit or is External signal 10k potentiometer 10 V Max current Min current Current limit e i a Backplate 2 a o EE SS o Safety quench Figure 3 13 External potentiometer connection for the threshold current limit The external potentiometer reacts in cascade with the I limit Limit I potentiometer on the front panel If the T limit Limit I potentiometer is set for example to 70 current the external potentiometer can limit the maximum current from 0 to 70 of the nominal thyristor unit current 320 470 User Manual Wiring Power limit connection The standard version of the 470 series thyristor units is equipped with the threshold limit of the controlled parameter power squared current or squared load voltage This limit is a function which is used to limit the load current to a specified value independently from the setpoint The controlled parameter limit is called the Power limit since at a constant load resistance the parameters V and P are proportional to a dissipated power If the current limit option is used and if the parameter P is selected for control these two limits current and power are redundant The
34. up using thyristors Caution A N It is the user s responsibility to ensure that the thyristor unit nominal values are compatible with the conditions of installation and operation before commissioning the thyristor unit Power Nominal current Nominal line to line voltage Power supply frequency Dissipated power Cooling Fan Thyristor protection Load Residual current External wiring Environment Mounting Operating temperature Storage temperature Protection Operating atmosphere Humidity Pollution Electromagnetic compatibility the product installed and used in accordance with User Manual see European Directives chapter Electrical safety CE Mark 15 A to 150 A internal thyristors Up to 4000 A external thyristor block 100 Vac to 500 Vac 10 15 Inhibit below 70 of the nominal voltage return to 85 of the nominal value 50 Hz or 60 Hz 2 Hz 1 3 W approximately per ampere 470 and 471 models Permanent fan cooling above 100 A nominal Consumption 23 VA 471 model Powered by the auxiliary power supply voltage Internal high speed fuse 15 A to 125 A nominal External fuse for 150 A nominal 471 model Varistor and RC snubber circuit Single phase resistive with high temperature coefficient or nductive or tranformer connected In the OFF state typically below 30 mA internal thyristors To be performed according to the standards IEC 364 In closed metal cabinet 0 C to 50 C
35. 1000 4 2 EN 61000 4 2 06 1995 Fast transients IEC 1000 4 4 EN 61000 4 4 01 1995 Radioelectric frequency IEC 801 3 prEN 61000 4 3 1984 electromagnetic fields Emission Radiated EN 55011 1991 Conducted EN 50081 2 1991 the choice of the applicable With an external filter standard depends on the IEC 1800 3 prEN 61800 3 1996 application Without external filter Applies for the second environment In order to guarantee the best service Eurotherm has validated the compliance of the 470 products with these test standards through design and laboratory tests that have been validated with a Technical Construction File by a Competent Body LCIE Laboratoire Central des Industries lectriques EXTERNAL SERIES FILTERS Toreduce the conducted emissions that occur when using thyristor units Eurotherm can supply external filters Nominal current of 470 Serial filter order code 25 Ato 60A FILTER TRI 63A 00 75 Aand 100A FILTER TRI 100A 00 150A FILTER TRI 160A 00 Printed in France 05 96 HA 175076 Issue 1 CE SAFETY CE CE The 470 products installed and used in accordance with this User Manual are designed to comply with the essential protection requirements of the Low Voltage Directive 73 23EEC dated 19 02 73 amended by Directive 93 68 EEC dated 22 07 93 MARK The CE Mark of 470 products implies that the essential protection requirements of the Low Voltage Directive are observed Th
36. 89 BER Ej 22 23 24 25 26 27 28 29 30 31 32 13 33 14 34 i 16 36 amp o v Backplate o o N oO on Control terminal block Driver terminal block ajo Driver Control cable clamp cable clamp Figure 3 7 470 thyristor unit control and driver terminal labelling Control terminal block capacity 0 5 mm to 2 5 mm Control terminal tightening 0 7 N m 470 User Manual 311 Wiring Terminal number Assignment Not connected Load current image output Retransmission 0 2 5 V Full wave rectified signal Manual input External input Common 0 V Not connected 10 V user voltage Not used Current limit input Not used Thyristor unit operation inhibit input Table 3 3 Control terminal identification 342 470 User Manual Wiring DRIVER TERMINAL BLOCK The following connections are made on the driver board user terminal block the safety quench connection the load voltage signal the power limit signal the retransmission signals On the 472 model only the external thyristor firing signals and the current information are also connected to the driver terminal block The drive
37. Driver terminal block ssm 3 13 Inp t sigrials tino SUR OHIO RAE 3 14 Safety GUEN oe teta coe eerte cientes 3 14 INNIDIte ite e peas eee emp 3 14 External control connection eeeeeeeee 3 15 Control of multiple thyristor units sessss 3 16 Parallel input connection esseeeeeese 3 16 Serial input connection esses 3 16 Manual control connection seeeeeeeeene 3 17 Current limit connection optional eesssss 3 18 Limit set using the potentiometer on the front panel 3 18 Limit set using an external voltage 3 19 Limit set using an external potentiometer 3 20 Power limit connection see 3 21 Limit set using the potentiometer on the front panel 3 21 Limit set using an external potentiometer 3 22 Limit set using an external voltage 3 22 Retransmission signals eeeeeene 3 23 External thyristor block control 472 model 3 24 Examples of wiring diagrams se 3 26 470 and 471 model thyristor units sses 3 26 Driver unit 472 model sesseeeeeeeeernnnnnne 3 28 Cont2 470 User Manual Contents Continued Chapte
38. I 61 63 Figure 3 2 User terminal blocks 470 User Manual 35 Wiring Auxiliary power supply The auxiliary power supply powers the following the electronic control the fan for fan cooled units the partial load failure detection circuit Terminals 51 and 52 are used when the electronic control circuit is powered at 230 V in the voltage range 200 V to 260 V Terminals 51 and 53 are used for voltages outside the range 200 260 V 110 or 400 V for example Terminal 51 is the reference phase or neutral The auxiliary power supply voltage is specified in the unit code see page 1 9 Caution N The phases arriving on terminals 51 to 53 must be identical to those on the unit s power terminals especially if several units are distributed amongst several phases of a three phase power supply The order of connection must be observed The control must be powered up after or at the same time as the power The control must be powered down before or at the same time as the power The auxiliary power supply is protected from the electrical disturbances on the power supply in common mode Caution AN Each connection wire from the auxiliary power supply to a phase must be protected by a 1 A fuse 36 470 User Manual Wiring Alarm relay contact The connection of the partial load failure detection relay contact PLF alarm which signals the active alarm state is
39. IAL LOAD FAILURE DETECTION SETTING The partial load failure PLF detection is adjusted using the potentiometer labelled Adjust Seuil on the front panel see figure 6 2 The purpose of this setting is to adapt the PLF detection with the maximum sensitivity to the real thyristor unit load To guarantee correct operation of the PLF detection circuit the load current must not be less than 10 of the thyristor unit nominal current in the case of use of a bulb as a load for a thyristor unit test in the workshop the PLF detection indicator light Fail D faut is always lit During commissioning the following setting must be made First of all make sure that the thyristor unit is connected correctly and that the thyristors are in permanent firing mode Turn the PLF detection adjustment potentiometer completely anti clockwise and check that the Fail D faut indicator light on the front panel is off Turn the Adjust Seuil potentiometer slowly clockwise until the indicator light comes on Turn the potentiometer slowly anti clockwise until the Load Fail indicator light has just gone off The potentiometer set in this way is used to obtain maximum sensitivity for the partial load failure detection really connected with the thyristor unit The push button on the front panel labelled Test which simulates a current drop in the load is used to check the operation of the PLF circuit without having to disconnect the load This
40. OWG zh AE a Lotto eiit 1 6 Environment cora ira ceo lra Ci di 1 6 Gonlitol fetes es te ee Si et take 1 7 Retransmissions ccccccccceecceessseseeceeeeeeteeeeaaeesseees 1 8 Current limit iini Ai Boece ee 1 8 Power Mite icc iride ote oer cir rie furtis 1 8 Partial load failure detection 1 8 Thyristor unit coding se 1 9 Backplalte 1 eed oen ies 1 10 Short or full code eee 1 10 Coding example essen 1 11 470 series thyristor unit and installation parameters eeeeeeeees 1 11 Thyristor unit coding seeen 1 11 Serial number labels eee 1 12 Chapter 2 INSTALLATION Safety during installation ssesesesssss 2 2 DIMENSIONS tis steer ed diee eden RE CRANE OR GE aes 2 3 Mechanical mounting seeeee 2 4 470 User Manual Cart Contents Continued Page Chapter 3 WIRING Safety during Wiri mireasa pde tee E ets 3 2 Fixing the power cables eene 3 3 User terminal blocks 3 5 Auxiliary power supply eem 3 6 Alarm relay contact a m e eges 3 7 Load voltage information eeeene 3 8 Control Cables inter tins t ere es 3 9 HMM 3 9 Connecting the shield to the ground ssssss 3 10 Control terminal block esseeeneenm 3 11
41. Tse gt lt TE gt Figure 5 4 Soft start and end in burst firing mode The duration of the soft start and end can be set from 0 to 250 ms by the potentiometer on the control board See Commissioning chapter The soft end time Ts is not included in the firing time Tp but all the power sent to the load is taken into account in the control After the soft start with thyristor firing angle variation the thyristor unit remains in full firing during the firing time if the current limit is not enabled Note For soft starts of loads with very high resistance variations as a function of temperature e g Kanthal Super use the Special 677 470 User Manual 55 Operation Over current elimination for the inductive load The Fast cycle and Slow cycle Burst firing modes composed of complete supply cycles start at zero voltage for purely resistive loads For non saturating inductive and transformer connected loads in Single cycle and Burst mode without soft start firing at zero voltage generates transient operation which could in certain cases induce the appearance of over currents figure 5 5 a and a blow out of the thyristor protection fuse To prevent this over current the first firing of the thyristors for non saturating inductive and transformer connected loads can be delayed with reference to the corresponding zero voltage figure 5 5 b The optimum delay angle 9 must be adjusted w
42. alues The signals from the diagnostic sockets may also be viewed using an oscilloscope In order to measure the RMS load voltage and current values in the diagnostic positions 1R 2R 3R 6R a voltmeter can be connected to the oscilloscope connection terminals 64 470 User Manual Commissioning Fail c O D faut Seuil P Limit P Limit Q Q Test Diagnostic socket limit P Adjust Diagnostic socket Left Limit P R bl Right Oscilloscope lt connection terminals isolated Fuse fail from power L1 D f fusible Digital display A Connection ribbon 9 V dc n Battery or rechargeable battery Battery charger Figure 6 1 Connection of the EUROTHERM type 260 diagnostic unit to a 470 series thyristor unit 470 User Manual 65 Commissioning Thyristor firing angle variation Assignment Current image full wave rectified 0 of setpoint 9 0 50 of setpoint 9 2 90 100 of setpoint 180 Manual input if used PLF output not in alarm In the alarm state External setpoint Example 0 10 V Threshold current limit optional Current image for PLF detection Load voltage image Control setpoint Not used Firing demand 0 Vmean 1Vpeak 8 4 V 10V reference 10 V0 1 V Auxiliary supply image 24 V full wave rectified Pulse output 24 V pulses
43. ameter limit e partial load failure detection pulse gating circuit inhibit and safety quench load current voltage and power image retransmission 1 2 470 User Manual Identification User terminal blocks A ES A PSP Fail S D faut Ln Oa Adjust eu Seuil g P Limit Q e Q Test P Limit limit P Adjust Limit P R gl l Fuse fail D f fusible i i Diagnostic gius Socket Socket Left 240V 75A Right Control cable ink Control cable clamp Heatsink clamp Power terminals Figure 1 1 Overall view of the 470 series thyristor unit 470 User Manual Identification The 470 series thyristor units are fitted with a control board which generates the input signals and controls the parameter measured by the driver board a driver board which controls the true power of the load using the load voltage and current measurements and retransmits the controlled parameter DC voltage and the load voltage and current instant AC values for the 472 model this board generates the external thyristor firing signals a neutral board to connect the reference neutral or phase depending on wiring an RC snubber board which protects the thyristors from fast voltage variations and generates the thyristor firing pulses this board has a thyristor pulse gating circuit to prevent unstable firing in certain applications The control system controls t
44. ation Modulation time The modulation time in Burst firing mode is variable according to the output power Due to this type of control the 470 unit possesses setting precision adapted to each specific setpoint zone At 50 power the typical value of the modulation time is 0 8 s for the Fast cycle 8s for the Slow cycle For a zone below 50 of the maximum setpoint the firing time decreases and the modulation time increases For a power zone above 50 46 the non firing time decreases as the modulation time increases For example in the Fast cycle mode for 5 96 power T 250 ms T 25s for 90 power T 2 25 s Ty 2 5 s 12s Modulation TNF 04s Distributed 100 Figure 5 3 Modulation time as a function of power Fast cycle 5 4 470 User Manual Operation Soft start end Soft operation start or start and end can be configured in the Slow cycle and Fast cycle Burst firing modes The soft start duration Tg is the time taken for the thyristor unit output power to change from 0 to 100 by varying the thyristor firing angle from 0 to full firing The soft end duration Ts is the time taken for the thyristor unit output power to change from 100 to 0 by varying the thyristor firing angle from full firing to 0 Soft start with Soft end with increase in the decrease in the firing angle firing angle Full firing Tss 2
45. be connected in the circuit with a voltage which never exceeds 250 V single phase or three phase 230 V power supply External thyristor block 472 model Check that the connections of the Cathode Gate twisted wire pairs are correct The current of the current transformer secondary circuit must be 5 A for the nominal current of the primary circuit 470 User Manual 63 Commissioning DIAGNOSTIC UNIT For easier commissioning and setting operations and for the thyristor unit state diagnostics it is advisable to use the EUROTHERM type 260 diagnostic unit The 20 way switch of the diagnostic unit is used to display the values of the thyristor unit and controlled parameters on its digital display The unit displays two decimal places in order to permit the precise indication of the measured values The diagnostic unit possesses a ribbon cable which is plugged into two 20 pin sockets Left diagnostic socket and Right diagnostic socket provided on the front panel of the thyristor unit Note The positions of the diagnostic unit corresponding to the Left socket are marked NL N indicates the number of the position respectively the positions of the diagnostic unit connected to the Right socket are marked NR Tables 6 1 to 6 3 give the description of each position in the diagnostic unit and the typical values of the signals measured for the left and right sockets N Important The values measured are mean DC v
46. ch 8 50 Hz 1 60 Hz 0 Table 4 4 Configuration of the power supply frequency used 470 User Manual q Configuration CONFIGURATION OF THE DRIVER BOARD The driver board comprises the strip SW of mini switches used to configure the parameter controlled by the control system feedback Reconfiguration is possible when the thyristor unit is disconnected from its backplate see figure 4 1 Controlled parameter True power Position of SW mini switches Squared RMS load voltage Squared RMS load current Table 4 5 Configuration of the controlled parameter In the above table the 1 indicates the position of the mini switch lowered towards the board position marked ON see figure 4 2 4 8 470 User Manual Operation Chapter 5 OPERATION THYRISTOR FIRING MODES General The 470 series thyristor units have the following thyristor firing modes Burst firing fast slow or single cycle with or without soft start start and end They can be reconfigured by the user as described in the Configuration chapter Phase angle mode In Phase angle mode the power transmitted to the load is controlled by firing the thyristors for a part of the power supply voltage half cycle see figure 5 1 The firing angle varies in the same direction as the input signal with the control system The power emitted is not a linear function of the firing angle
47. de Thyristor Action of potentiometer firing mode P4 Phase angle No action Single cycle Delayed first firing of the Slow cycle thyristors at the start of each Fast cycle firing cycle Burst firing Soft start duration with soft start in thyristor firing angle variation Burst firing with Soft start and end soft start and end duration in thyristor firing angle variation Table 6 4 Effect of the preliminary setting potentiometer 610 470 User Manual Commissioning Default position of potentiometer P4 When it leaves the factory the potentiometer P4 is set as shown below Thyristor firing Position of potentiometer mode P4 Fast cycle Turned fully anti clockwise Slow cycle Zero delay Single cycle Soft start Turned fully clockwise Soft start Maximum ramp and end Phase angle No action Table 6 5 Default setting of potentiometer P4 Resistive load with low resistance variations For loads with low resistance variations as a function of temperature use the Single cycle or Burst firing thyristor firing modes The preliminary setting must guarantee thyristor firing at zero voltage Ensure that potentiometer P4 on the control board is turned completely anti clockwise delay angle 0 and ramp absent see table 6 5 Switch on the thyristor unit On the external input terminal 4 of the control terminal block apply a signal corresponding to 0 of the control signal Using
48. delay equal to 90 e Set a control signal corresponding to approximately 20 of the maximum setpoint Slowly turn potentiometer P4 anti clockwise in order to reduce the over current visible on the oscilloscope screen at the beginning of each burst as much as possible Saturating inductive load When controlling a saturating inductive load e g transformer primary with a resistive load having a low resistance variation on the secondary use the Burst firing with soft start firing mode with no current limit The soft start or start and end time is set using potentiometer P4 on the control board for the following following thyristor firing modes slow or fast cycle with soft start slow or fast cycle with soft start and end The soft start or soft start and end can be adjusted from 0 to 250 ms The maximum ramp is obtained with potentiometer P4 turned completely clockwise 612 470 User Manual Commissioning Locking by quarter turn PLF detection indication Power limit setting P Limit O 4 P Limit 5 P Adj PLF detection PRSE Q x setting i j Power PLF setting calibration test I Current limit setting optional Di i q Fuse fail iagnostic Diagnostic socket 1 socket Left Def fusible Right 7 Internal fuse blown indicator light 470 and 471 up to 125A Figure 6 2 Front panel of the 470 series thyristor unit 470 User Manual 613 Commissioning PART
49. e 3 5 a The control wires must be long enough for the connection between the metal cable clamp and the control terminal block The wiring inside the unit must be as short as possible Isolating sheath Control wires Shield 1 5 to 2 cm 20 to 40 cm Control wires Isolating sheath Shield folded back b Figure 3 5 Control cable stripping Fold back the shield on the isolating sheath figure 3 4 b Insert the cable in the metal cable clamp so that the shield is located in the stirrup and does not pass the cable clamp Tighten the stirrup 3 5 x 1 flat screwdriver tightening 0 7 N m Wires Cable clamp 4 Backplate T Tightening screw Shield folded back Cable Left hand side view Figure 3 6 Cable tightening and shield grounding The possible diameter of the cables with the shield folded back is 5 to 10 mm per cable clamp 340 470 User Manual Wiring CONTROL TERMINAL BLOCK The following connections are made on the control board user terminal block e the external or manual input signal e the thyristor unit operation inhibit e the threshold current limit e the load current retransmission The control terminal block is fixed on the backplate and can be accessed after the 470 thyristor unit has been unplugged a Warning Dangerous live parts may be accessible when the unit is unplugged ok Boo B
50. e 470 Technical Construction File is approved by a Notified Body LCIE Laboratoire Central des Industries Electriques DECLARATION OF CONFORMITY A CE Declaration of Conformity is available on request FURTHER INFORMATION For further information on CE Mark please contact your nearest Eurotherm office Printed in France 05 96 HA 175076 Issue 1 This 470 User Manual Part No HA 174836 intends for the 470 series power thyristor units manufactured from May 1996 The 470 User Manual Part No HA 020134 is valid for products manufactured before this date In order to help you reduce risks related to the effects of electromagnetic interference depending on the installation of the product Eurotherm can supply you with the EMC Installation Guide Part No HA 025464 This guide gives the rules generally applicable for Electromagnetic compatibility Manufactured by Eurotherm Automation S A ISO 9001 EN 29001 certified Printed in France 05 96 HA 175076 Issue 1 470 USER MANUAL The safety instructions for the installation and given in the pages below use of 470 series units are installation 2 2 2 4 wiring 3 2 3 11 3 13 3 14 3 24 configuration 4 2 commissioning 6 2 6 10 fuse protection 7 2 7 4 maintenance 7 5 Contents Chapter 1 IDENTIFYING THE THYRISTOR UNITS Page General introduction to the 470 series 1 2 Technical data i eret nets 1 6 P
51. e serious consequences on the installation Nominal current Capacity of the power and earth terminals 15Ato 75 A 470 model Tightening torque N m 100 A to 150A Power 50 or 70 471 model Earth 25 to 50 472 model Table 3 1 Details of power wiring for the 470 series Note Since the 472 units are electronic driver units they do not contain power terminal blocks 470 User Manual Wiring Without terminal covers 470 model Backplate p oS Terminal cover Terminal cover Load Line Safety earth Figure 3 1 Power and safety earth cable fixing points The cross section of the connecting conductors used must comply with the IEC 943 standard Distance between terminals mm 35 mm tunnel terminal M10 Screw Table 3 2 Power wiring details for the 470 series 24 470 User Manual Wiring USER TERMINAL BLOCKS The user terminal blocks are located at the top left of the backplate They are used to connect the auxiliary power supply the PLF alarm relay contact the load voltage for control The unit must be unplugged from the backplate in order to access the user terminal blocks The connections are made using screw terminal blocks terminal tightening torque 0 7 N m The maximum wire cross section is 2 5 mm 470 and 471 models 472 model N
52. e using an external potentiometer or an external voltage Partial load failure detection Alarm Operation test Signalling 20 current decrease detection Setting on front panel using Adjust Seuil potentiometer Using Test push button on front panel Load Fail indicator light on the front panel Alarm relay contact open in alarm state in standard version Contact closed in alarm state optional Caution IN Due to the continual improvement of products Eurotherm may be required to modify specifications without prior notice For any further information and in the event of doubt contact your Eurotherm Office 1 8 470 User Manual Identification THYRISTOR UNIT CODING Model Nominal Auxiliary power Nominal Input Firing Control Options End voltage supply current signal mode mode 00 Input signal Code Thyristor unit 470 75 A max 470 113 471 125 A max 471117 471 150 A max 471 100 Driver for external thyristors 472 472 000 Nominal voltage Code Thyristor firing mode Phase angle Single cycle Fast cycle 0 8 s Fast cycle with soft start Fast cycle with soft start and end Slow cycle 8 s Slow cycle with soft start Slow cycle with soft start and end Auxiliary power supply Code Control mode Code 100 V and 230 V 115 V and 230 V 35 3 n A Y Squared load voltage 380 V 400 V 415 V and 230 V Squared load current 440 V and 230 V 480 V 500 V and
53. ector can be adjusted to 10 Vdc exactly for the nominal power of the load used The value read in position 9R of the diagnostic unit is 2 5 V mean for the nominal calibration 470 User Manual 69 Commissioning PRELIMINARY SETTINGS The preliminary setting is used to adapt the first thyristor firings to the type of load used For resistive loads with low resistance variations firing at zero voltage does not generate steep voltage fronts thus minimising the electromagnetic interference produced For resistive loads with high resistance variations use of the Burst firing modes with soft start reduces the current requirement when the load is cold with a low resistance Current limit option must be used For non saturating inductive and transformer connected loads delayed first firing eliminates the transient over current see Operation chapter This delay can be adjusted between 0 and 90 and only acts on the first half cycle The preliminary setting is carried out using potentiometer P4 located on the control board see figures 4 1 and 4 3 To access the setting potentiometer the unit must be unplugged from its backplate Warning Dangerous live parts are accessible when the unit is unplugged Only a qualified person authorised to work in a low voltage industrial electrical environment should access the inside of the unit The effect of the setting potentiometer depends on the thyristor firing mo
54. ed periodically depending on the degree of pollution of the environment Warning A Every six months check that the screws holding the power cables and the safety earth are correctly tightened see Wiring 470 User Manual Maintenance TOOLS Operation Flat screwdriver Wrench Electrical mm equipment Attachment of the backplate Depending on MA screw heads selected Safety earth connection 1x 6 470 and 472 1x 8 471 Power connection power supply HEX17 M10 side and load connection 1 x 8 470 and 471 471 Internal thyristor fuse replacement 2x15 Cable clamp tightening 0 5 x 3 5 Control and auxiliary power supply voltage connection Commissioning and setting RMS ammeter or clip Eurotherm type 260 diagnostic unit recommended Table 7 3 Tools 7 6 470 User Manual
55. eee e 5 13 Inhibit and safety QUENCH seene 5 14 470 User Manual Cont3 Contents Continued Page Chapter 6 COMMISSIONING PROCEDURE Commissioning procedure safety 6 2 Checking the characteristics seseseeeeeee 6 3 Load CUutTent tiet eee pi bein nae 6 3 Power supply voltage ee 6 3 Auxiliary supply voltage 6 3 Input signials 3 e tero eee ene 6 3 Partial load failure detection eesin 6 3 External thyristor blocks 6 3 Diagnostic Unt in oreet tud een Se ce e Edge 6 4 Calibration 5 niin ee ete REO Cp 6 9 Preliminary settings eeeeeeeeeeeeeeeeeneee eene 6 10 Default position of potentiometer P4 ssssss 6 11 Resistive load with low resistance variations 6 11 Resistive load with high resistance variations 6 11 Non saturating inductive load eeeeeees 6 12 Saturating inductive load eeeeeeeees 6 12 Partial load failure detection setting sssse 6 14 Current limit setting optional 6 15 Power Imis asenna ete ete b ee Ree eet Pee Eoi a 6 16 Checks in the event of abnormal operation 6 17 Chapter 7 MAINTENANCE Thyristor protection eeeceeeeseeeeeseeeeeeeeeeseeeeeeneeeeesaeeesenaeeeeaas 7 2 Thyristor protection fuse
56. entiometer on the front panel Setting using an external voltage The power limit threshold setting external voltage reacts in cascade with the P Limit potentiometer on the front panel This voltage between 0 and 10 V should be connected between terminals 6 0 V and 35 Power limit input Terminal 35 is positive 322 470 User Manual Wiring Retransmission signals The current image is retransmitted in the form of a full wave rectified signal 2 5 V mean between terminals 3 and 6 for the nominal load current and in the form of an AC signal 2 5 V RMS between terminals 34 and 6 in full firing The load voltage image is available between terminals 33 and 6 in the form of an AC voltage 2 5 V RMS in full firing The true power image or squared load voltage or squared load current in the form of a DC voltage 10 V for a nominal calibrated load power is available at terminal 36 referenced in relation to 0 V terminal 6 The true power information is correct for the Phase angle and Single cycle firing modes it is modulated as a function of the modulation in Burst firing The minimum impedance to be connected to the retransmission outputs is 5 KQ Backplate Load parameter images Current 0 2 5Vac Voltage 0 2 5Vac Power 0 10Vdc lt Figure 3 15 Retransmission signal connection 470
57. gle frequency 50 Hz the delayed thyristor firing potentiometer is set for the 90 delay inductive and transformer connected load and for the maximum start ramp resistive load 1 10 470 User Manual Identification CODING EXAMPLE 470 series thyristor unit and installation parameters Nominal load current 45 amperes Nominal power supply voltage 380 volts line to line 50 Hz Auxiliary supply voltage 380 volts Input signal 0 10 volts Firing mode Fast cycle burst mode firing with soft start Control mode True power Options Current limit Partial load failure detection alarm relay contact closed in alarm state No backplate Thyristor unit coding 470 113 22 43 062 060 055 28 55 83 76 00 Caution A N The nominal voltage of the 470 series thyristor unit must correspond to the power supply voltage used to prevent problems of non operation for voltages lower than 70 of the nominal voltage inhibit below 70 of the nominal voltage response time 10 ms automatic reset 2 s after return to 85 of the nominal value To obtain optimum control the nominal current of the thyristor unit must be as close as possible slightly above the real load current 470 User Manual 111 Identification SERIAL NUMBER LABELS An identification label specifying the coding of the thyristor unit and two configuration labels give all the information relating to the factory setting
58. he true power the squared voltage or the squared load current as a function of an input signal and the selected feedback parameter The soft start in thyristor firing angle variation for high temperature coefficient resistive loads and the delayed firing angle at the first half cycle for the control of inductive and transformer connected loads minimise transient over currents The soft start or end duration can be set from 0 to 0 25 s per potentiometer located on the control board The 470 series thyristor units are equipped with a power limit and as an option a current limit only available in Phase angle firing and Burst firing with soft start modes The partial load failure detection circuit PLF detects a 25 increase in the load impedance independently of the power supply voltage variation The partial load failure detection circuit PLF alarm is set using a front panel potentiometer for the real current of the load used The PLF alarm is signalled by the alarm relay contact and by the Load fail indicator light on the front panel 1 4 470 User Manual Identification The 470 thyristor units have the following thyristor firing modes e thyristor firing angle variation Phase angle cyclic firing ratio modulation from 0 to 100 Burst mode Burst mode firing is characterised by different modes one firing or non firing cycle Single cycle slow cycle modulation time 8 s at 50 setpoint
59. hrough the power terminals L Line and Load The other end of the load is connected either to the neutral or to the second phase of the power supply depending on the selected configuration The terminal L should be connected to the phase of the power supply see figure 3 17 326 470 User Manual Wiring Line Line protection and main circuit breaker user installation Neutral PLF relay contact ll ua fuses 41 42 51 52 3 61 ar 4 e External S control 3a signal 6 Fo ov 470 lee or Ig 471 di 10V 12 Foo Control cable Safety earth Figure 3 17 Example of 470 and 471 thyristor unit connection Line Neutral wiring 470 User Manual 327 Wiring Driver unit 472 model The power section and the 472 driver unit are connected with thyristor firing signal connections and the load current and voltage measurement circuits L1 Line protection and main circuit breaker user installation O OO 41 42 3 4 Control t 5 signal l Oo 6 OV 10 V 12 LE 14 To H terminal 35 High speed fuse 1A fuse socket External thyristor block To 10V External
60. in vertical position in altitude 2000 m maxi 10 C to 70 C IP00 can be opened without tools according to IEC 364 Non explosive non corrosive and non conducting RH of 5 to 95 without condensation Degree 2 admissible defined by IEC 664 Immunity comply with Standards EN 61000 4 2 EN 61000 4 4 EN 61000 4 3 Radiated emission comply with EN 55011 Conducted emission comply with EN 50081 2 with an external filter comply with EN 61800 3 without external filter Comply with Low Voltag Directive 73 23 EEC The 470 products are CE marked see European Directives chapter 1 6 470 User Manual Identification Control Control supply Signal type Setpoint Input impedance Manual control Thyristor firing modes Transient current elimination Enable Inhibit Diagnostics Load control mode Wiring Connection Connection of the auxiliary power supply to the user terminal block Consumption 7 VA 470 and 472 model 30 VA 471 model Analogue Voltage 0 5 V 1 5 V or 0 10 V Current 0 5 mA 0 10 mA 0 20 mA or 4 20 mA Voltage gt 50 kQ Current 250 Q or 1000 Q depending on configuration 10 kQ external potentiometer The following can be reconfigured by the user Phase angle Single cycle burst firing with a firing or non firing cycle Fast cycle typical modulation time at 50 power 0 8 s Slow cycle typical modulation time at 50 power 8 s Fast cycle with adjustable soft
61. inals 21 and 22 of the driver terminal block This connection is made using a link on the driver terminal block Terminals 21 and 22 can be used for the serial connection of any safety contact e g thermal safety switch In this case the external connection wires should be shielded with the shielding earthed at both ends 5 14 470 User Manual Commissioning Chapter 6 COMMISSIONING PROCEDURE Contents Page Commissioning procedure safety sessssssssssss 6 2 Checking the characteristics sssseeeee 6 3 Eoad cuttrent iui tu Hte tbe det easet 6 3 Power supply voltage sem 6 3 Auxiliary supply voltage esm 6 3 Input sigrials enne 6 3 Partial load failure detection seeeeeeeess 6 3 External thyristor blocks 6 3 Diagnostic nlE oir a int aban 6 4 GCalibratiOb i ERE E RR DS 6 9 Preliminary settings n a 6 10 Default position of potentiometer P4 ssss 6 11 Resistive load with low resistance variations 6 11 Resistive load with high resistance variations 6 11 Non saturating inductive load esessesussss 6 12 Saturating inductive load sesssssssss 6 12 Partial load failure detection setting sessssss 6 14 Current limit setting optional
62. ing potentiometer by a 0 10 V external DC voltage which act in cascade with the I limit Limit I potentiometer on the front panel The limit threshold can be adjusted for the RMS load current from 0 to 110 of the nominal current from 0 to 120 of the squared current 470 User Manual 511 Operation PARTIAL LOAD FAILURE DETECTION The partial load failure PLF alarm detects an increase in the load impedance due to the failure of heating elements for example The sensitivity of the PLF circuit is used to detect the increase in the load impedance to 20 46 which detects the failure of one element out of 5 identical elements mounted in parallel On the 470 thyristor unit the alarm is indicated by an indicator light mounted on the front panel and labelled Load Fail lit when a partial load failure is detected by an alarm relay contact contact output is available on terminals 41 and 42 on the user terminal block at the top left hand corner of the thyristor unit backplate see page 3 5 The alarm relay is de energised in the alarm state when the thyristor unit power is on The alarm contact cutoff capacity 0 25 A at 250 Vac or 30 Vdc in the standard version is open in the alarm state or in the event of a unit supply failure The contact cutoff capacity must not exceed 250 V in any circumstances As an option code 83 this contact is closed in the alarm state The PLF alarm relay is acknowledged eithe
63. ired power limit can be calculated voltage in position 7R of the diagnostic unit V7 if the following parameters are available Nominal thyristor unit voltage Vyn C Nominal thyristor unit current after calibration Iyy A Maximum power allowed by the load PL uax W The voltage V7p of the diagnostic unit should be set to Vip V C5 V Puuax Von X lun If the controlled parameter is V and the maximum voltage allowed by the load is VL MAY the voltage V7 should be set to y2 Vg V 5 V _ L MAX y2 UN 616 470 User Manual Commissioning CHECKS IN THE EVENT OF ABNORMAL OPERATION Symptom The thyristor unit is not fired after a firing demand Action 1 1 Check that the power is present if the power is absent but the electronics supply voltage is present the thyristor unit indicates a PLF alarm and the indicator light on the front panel is lit 1 2 Check the state of the thyristor protection fuse 1 3 Check the connection of the auxiliary supply on the user terminal block terminals 51 and 52 or 53 1 4 Check that the electronics supply is present presence of 15V 15V 10V 24V voltages see tables 6 1 to 6 3 1 5 Check that the Inhibit input terminal 16 on the control board is not connected to 10 V terminal 12 1 6 Check that terminal 21 and 22 on the driver board Safety quench are correctly interconnected 1 7 Check that the control signal arrives correctly
64. ith the potentiometer on the control board see adjustment as a function of the load max delay 90 ui Over current ot a ot 010 b Delay angle Figure 5 5 Inductive load switching at zero voltage a and with delay angle b This firing mode is not suitable for saturating loads transformer primaries since 470 series units do not generate magnetisation ramps at power up 5 6 470 User Manual Operation CONTROL Control function Using the current and voltage measurement the following feedbacks are available the true power of all load types this power takes into account the possible phase shift between the instant current and voltage the squared RMS current the squared RMS voltage Process value 100 P v2 12 50 0 2 50 100 Setpoint Figure 5 6 Controlled parameter as a function of the setpoint The controlled parameter power squared current or squared voltage at the thyristor unit output is linear between 0 and 100 of its maximum value as the input signal varies between 2 and 100 of the maximum scale The accuracy of the control is guaranteed to be within 2 of the maximum value 470 User Manual 57 Operation The use of the true power in a control loop enables the supply of an accurate power of the load independent of variations in the power supply voltage or the load resistance due to the te
65. made on the user terminal block located in the upper part of the thyristor unit on the left The contact output terminals are marked 41 and 42 on the terminal block label The PLF alarm relay is de energised in the alarm state and when the unit is switched off On standard models the relay contact available between terminals 41 and 42 is open in the alarm state and in the event of a power failure Optionally code 83 the alarm relay contact is closed in the alarm state The partial load failure detection relay contact is protected against disturbances by an RC snubber circuit on the control board The alarm contact cutoff capacity is 0 25 A under 250 Vac or 30 Vdc The contact cutoff voltage must not exceed 250 Vac in any circumstances The PLF alarm relay contact output is suitable for driving an alarm unit The PLF alarm relay is acknowledged either by switching off the thyristor unit or by a return to the nominal current 470 User Manual 37 Wiring Load voltage information The 470 series power units and driver units use the load voltage information to perform true power control The load voltage measurement is connected to terminals 61 and 63 on the user terminal block Terminal 61 must be connected to the Load Neutral or Phase 2 common point Terminal 63 must be connected to the Load terminal or external thyristor common point Caution The order of connection must be observed otherwise the
66. mperature change or ageing of the components thermal control when the temperature of the heated component cannot be measured Power control is required for certain processes in which the temperature cannot be controlled for instance when the user requires power information process monitoring or calculation of the cost of energy for heat treatment Important For loads with high resistance variations as a function of temperature molybdenum molybdenum bisilicide tungsten platinum etc at low temperatures the 470 series units can switch to current limit if this option is installed and therefore no longer operate in power control mode The squared RMS load voltage or the squared RMS current represents the dissipated power in a purely resistive and constant load For loads with low resistance variations as a function of temperature iron alloys nickel chromium aluminium Inconel etc control in V is sufficient 5 8 470 User Manual Operation Pulse gating The 470 series thyristor unit thyristors are fired by a gate pulse train of a maximum duration of 5 ms In most single phase applications it is possible to send gate pulses every 10 ms so that the thyristors are polarised in direct mode positive anode in relation to the cathode or in inverse mode negative anode Each thyristor is only fired when its voltage is positive when it is negative the anti parallel thyristor is fired In certain
67. on the strip provided for this purpose in the lower part of the unit behind the power terminals and labelled as follows AN zer Caution To ensure that the 470 unit is grounded correctly make sure that it is attached to the reference ground plane panel or bulkhead If this is not the case it is necessary to add a ground connection no more than 10 cm long between the earth connection and the reference ground plane Warning AN The purpose of this connection is to guarantee correct ground continuity It is not in any circumstances a substitute for the safety earth connection 470 User Manual Wiring FIXING THE POWER CABLES The external wiring is performed at the front to the terminal blocks on the backplate once the backplate has been fixed with the unit disconnected For the 470 and 471 models the power cables are attached to the power terminal blocks marked L Line and Load located on the lower part of the unit The power and earth cables are connected to tunnel terminal blocks 470 model or screw terminals 471 model Above 125 A it is necessary to connect the power cables using round lugs The capacities of the power terminals are shown in table 3 1 The tightening torques must comply with the values shown in the same table Caution Tighten the power connections correctly A N Poor tightening can lead to incorrect operation of the thyristor unit and can hav
68. onal power up is impossible After the reconfiguration of the unit correct the codes on the identification label to prevent any maintenance problems later 4 2 470 User Manual Configuration LOCATION OF THE CONFIGURATION EQUIPMENT The jumpers and configuration mini switch strips are located on the thyristor unit control and driver boards The configuration mini switches can be accessed at the rear of the unit when it is unplugged from its backplate Their positions can be changed using a 0 4 x 2 5 mm flat screwdriver Driver board Input and firing mode Control board configuration mini Setting potentiometer Figure 4 1 Rear view of the 470 series thyristor unit without backplate 470 User Manual Configuration Two strips of mini switches are used to configure the input type and the control signal level the thyristor firing mode the frequency of the power supply used the controlled parameter feedback Input and firing mode configuration mini switches f 4 2 f A Control board 13 14 15 16 MAMAA MASAA Driver board Figure 4 2 Mini switch strips In the configuration tables below the switches of the mini switches are indicated as follows 1 switch lowered towards the board ON position 0 switch raised 4 4 470 User Manual Configu
69. panel Limit set usin g an external potentiometer Limit set using an external voltage Retransmission SIgrals ene bui iE D Bate hee External thyristor block control 472 model Examples of wiring diagrams se 470 and 471 model thyristor units sss Driver unit 472 noo RET page 470 User Manual 31 Wiring Chapter 3 WIRING SAFETY DURING WIRING A Warning Wiring must be performed by personnel who are qualified to work with low voltage electrical equipment It is the user s responsibility to wire and protect the installation in accordance with current professional standards A suitable device guaranteeing electrical separation of the equipment and the power supply must be installed upstream from the unit in order to perform the operation in complete safety All power and control connections are made to the terminal blocks located on the mounting backplate and must be made without a unit present AN Warning Before any connection or disconnection make sure that the power and control cables and wires are isolated from the voltage sources For safety reasons the safety earth cable must be connected before any other connection during wiring and must be the last cable to be disconnected The safety earth is connected to the screw located
70. r 4 CONFIGURATION Page Safety during configuration eeeeess 4 2 Location of the configuration equipment 4 3 Configuration of the control board sssssse 4 6 Irp t TYPO uet meet Pete pm eene 4 6 Automatic input external signal ssse 4 6 Manual input sai 5 61 atero 4 6 Thyristor firing mode eee 4 7 Frequengcy aoira aa eaea ea E gir galee tee creek 4 7 Configuration of the driver board 4 8 Chapter 5 OPERATION Thyristor firing modes 5 2 Genetal IRR e datei aee ect 5 2 Phase angle mode sssseeee 5 2 Burst firing MOA Essin ieia k apni tert tret 5 3 Single cycle mode seseeeeeeeneee 5 3 Modulation time see 5 4 Soft start end iiiter edere 5 5 Over current elimination for the inductive load 5 6 Gontrol 4 meiste e tte duet 5 7 Control f nction siecle de inde 5 7 PulSe Qatinighsses 2 c52c22i8 a REOR SB Re 5 9 Power liMit esserne A ete ede dee cent deste eee hed 5 10 Current limit Optional eeeeeenn 5 11 Partial load failure detection eeeeseeesese 5 12 Retransmlssion iter ere D RR 5 13 Load current image sene 5 13 Load voltage image e 5 13 True power image ee
71. r by switching off the thyristor unit or by a return to the nominal current 5 12 470 User Manual Operation RETRANSMISSION The 470 thyristor units possess retransmission of load current voltage and power images in the form of a DC and AC signal Load current image A DC load current retransmission signal is available on the control terminal block between terminals 3 Current image and 6 0V The full wave rectified output signal is proportional to the instant load current 2 5 Vnean for the nominal current of the thyristor unit An AC signal proportional to the RMS load current is available at terminal 34 of the driver terminal block It is referenced in relation to 0 V terminal 6 and equal to 2 5 V RMS for the nominal current of the thyristor unit after calibration The current image can be used for tests or for an external measurement minimum impedance of circuit connected in parallel 20 KQ for the DC signal and 5 KQ for the AC signal Load voltage image The AC load voltage retransmission signal is available between terminals 33 Load voltage image driver board and 6 0V control board This signal is proportional to the RMS load voltage and equal to 2 5 V RMS for the nominal load voltage Minimum impedance of circuit connected in parallel 5 KQ True power image The 0 10 V DC true power retransmission signal is available at terminal 36 of the driver terminal block It is referenced is
72. r terminal block is fixed on the backplate and can be accessed after the 470 thyristor unit has been unplugged see figure 3 7 Warning AN Dangerous live parts may be accessible when the unit is unplugged Control terminal block capacity Control terminal tightening 0 5 mm to 2 5 mm 0 7 N m Terminal number Assignment 21 and 22 Safety quench 23 for 472 24 for 472 External thyristor 1 cathode External thyristor 1 gate 25 Not used 26 for 472 27 for 472 External thyristor 2 cathode External thyristor 2 gate 28 to 32 Not connected 33 34 0 2 5 Vac load voltage image output 0 2 5 Vac load current image output 35 36 Controlled parameter limit input 0 10 Vdc controlled parameter retransmission 37 and 38 for 472 External thyristor load current signal input Table 3 4 Terminal identification on the driver board terminal block For the 470 and 471 models the terminal numbers on the driver terminal block are 21 to 36 For the 472 model the terminal numbers on the driver terminal block are 21 to 40 470 User Manual 313 Wiring INPUT SIGNALS The control wires are connected to the screw terminals on the control terminal block attached to the backplate The control terminal block is accessible with the thyristor unit dismounted from the backplate To dismount the thyristor unit from its backplate unlock the upper attachmen
73. ration Two configuration jumpers J1 and J2 are located on the control board They are used to configure soft start end the Burst firing mode fast cycle or slow cycle Configuration jumpers Configuration Setting potentiometer mini switches P4 PLF detection Indicator light Setting Test button 1 MUA O10 NO Current limit setting optional Front panel Diagnostic socket Left are Figure 4 3 Location of configuration equipment on the control board Thyristor units ordered with a short code are supplied with the following configuration the input configured for 4 20 mA the thyristor firing mode firing angle variation Phase angle frequency 50 Hz the thyristor delayed firing potentiometer set to the maximum start ramp resistive load and to 90 delayed firing inductive and transformer connected load 470 User Manual 8 Configuration CONFIGURATION OF THE CONTROL BOARD Input type The input signal type is configured using mini switches 1 to 4 strip SW1 Reconfiguration is possible when the thyristor unit is disconnected from its backplate In tables 4 1 to 4 4 the 1 indicates the lowered position of the switch towards the board Automatic input external signal Automatic Position of the mini switches SW1 external input signal 2 3 0 5 V 0 10 V 1 5 V 0 5 mA 0 10 mA 1 5 mA 0 20 mA 4 20 mA ooocorolocoro OoO coco o c
74. relation to 0 V The power indication is 10 Vdc for a nominal power transmitted to the load nominal power equal to the product of the nominal load voltage by the nominal load current after calibration Minimum impedance of circuit connected in parallel 5 kQ The true power image is DC for the Phase angle and Single cycle firing modes It is modulated in Burst firing as a function of the thyristor firing modulation 470 User Manual 543 Operation INHIBIT AND SAFETY QUENCH The 470 thyristor units possess an active operation inhibit which requires a voltage to be applied to a control terminal block The absence of the inhibit voltage enables the operation of the thyristor unit The inhibit input is available between terminal 16 Enable input and terminal 6 0 V of the control board The inhibit is active when a DC voltage of 10 V 4 V minimum 32 V maximum relative to terminal 6 0 V is applied to terminal 16 see Wiring chapter To inhibit the thyristor unit the Enable input terminal can be connected using a normally closed contact to the 10 V voltage output terminal 12 on the control terminal block If the thyristor unit is inhibited the thyristor firing signals are eliminated irrespective of the input signal To enable the thyristor unit terminal 16 must not be connected to a voltage specified above The thyristor unit can be inhibited by disconnecting the safety quench connection term
75. rossing pulse 10 5 V 12 5 V peak 0 6 ms Electronics supply 0 V OV Not used Enable 10V Table 6 2 Assignment of the positions of the EUROTHERM type 260 diagnostic unit Left diagnostic socket All models 470 User Manual 67 Commissioning All firing modes Position Assignment 0 of setpoint 100 of setpoint 470 471 Load current AC signal 472 image 2 5 V RMS 0 V mean Load voltage for AC signal control 2 5 V RMS 0 V mean Load voltage AC signal image 2 5 V RMS 0 V mean Power True 13 5 V limit Not true 0 V True power image nominal load OV 10V Current image for AC signal control OV 2 5 V RMS 0 V mean Power limit 5 V for 100 threshold threshold 0 V for 0 threshold 15V electronics supply 15 V 150 mV Instant power Single pole double frequency image OV 2 5 V mean signal 472 Oscillator input 24V 24 V pulses no pulses 470 471 Used during 472 maintenance 15V electronics supply 15 V 150 mV 472 Gate pulses of 24V 24 V pulses thyristor T1 no pulses Used during maintenance Gating input of AC signal 1 half cycle positive thyristor T2 Gate pulses of 24V 24 V pulses thyristor T2 no pulses Pulse oscillator No pulses 24 V pulses 470 to 472 Electronics supply 0 V OV 472 Gating input of AC signal thyristor T1 1 half cycle negative 24V electronics supply 24 V 40 2 V 4 V
76. s nonetheless necessary to connect terminals 14 and 12 Otherwise the current limit is at zero and the thyristor unit cannot output 318 470 User Manual Wiring Limit set using an external voltage To set the current limit threshold using an external voltage a 0 10 V voltage should be connected between terminals 14 Current limit and 6 0 V terminal 14 is positive s o o e 0o ooo i IE 2 s o External 0 0 ao LIT 3 control Z signal MINE 2 no Backplate External current limit voltage o o G a x S e Figure 3 12 External voltage connection for the threshold current limit When an external voltage is used to set the limit threshold it reacts in cascade with the position of the I limit Limit I potentiometer on the front panel This means that if the I limit Limit I potentiometer is set for example to 50 current the external voltage from 0 V to 10 V limits the maximum current from 0 to 50 of the nominal thyristor unit current The Current limit terminal 14 input impedance is greater than or equal to 150 KQ 470 User Manual 349 Wiring Limit set using an external potentiometer For the threshold current limit it is possible to use an external potentiometer A 10 KQ potentiometer should be connected between terminals 6 0 V and 12 10 V of the control
77. s of the thyristor unit The identification label is externally located at the top of the right hand side panel of the unit E EUROTHERM 2 20 WORTHING ENGLAND 903 268500 MODEL 471 117 22 43 1 17 073 002 28 55 83 76 00 SERIAL No LC9999 001 001 03 96 RANGE 125A 380V AUXILIARY SUPPLY 350 450V 200 260V ANY OTHER FUSE INVALIDATES GUARANTEE FERRAZ C99960 I R EE1000 150 BRUSH 150EE Figure 1 2 Example of an identification label for a 471 model thyristor unit The information corresponds to nominal current 125 A nominal voltage 380 V auxiliary supply in the range 350 to 450 V 4 20 mA input phase angle firing with power feedback current limit available PLF alarm contact closed in alarm state unit delivered with no backplate The configuration labels present the factory settings The standard configuration 4 20 mA input Phase angle firing mode and frequency 50 Hz is shown on one of the configuration labels If the configuration is different from the standard it is shown in the appropriate boxes In this case the position of the configuration mini switches for the selected input signal and firing mode are shown The second configuration label shows the selection of the feedback mode using mini switches The information on the configuration labels is shown in French and in English Caution A N Any reconfiguration done by the user will render obsolete the original in house configuration code shown
78. sing the P limit potentiometer on the front panel of the thyristor unit True 3 P without limit power P 80 P limit 100 threshold 50 0 5095 100 Setpoint Figure 5 7 Threshold power limit A remote power limit is possible using external components external potentiometer or voltage see Wiring chapter In this case the limit is in cascade with the setting using the front panel potentiometer The P Limit potentiometer is used to set the maximum threshold of the power and the external components potentiometer or voltage adjust the power value between 0 and the valeur set using the P Limit potentiometer on the front panel 5 10 470 User Manual Operation CURRENT LIMIT OPTIONAL As an option the 470 series thyristor units can use the current measurement to limit the RMS load current to a specified value independently from the external input signal applied to terminal 5 or 6 This function gives a limit of the squared RMS load current P 12 12 100 PY Irms 74 75 12 limit EY threshold 5096 0 50 100 Current limit I2 proportional to the limit signal Figure 5 8 Example of current limit low temperature coefficient load For the current limit the maximum load current threshold is set using the potentiometer marked T limit Limit I on the front panel The Threshold limit input can also be controlled by an external sett
79. start between 0 and 250 ms with or without soft end Slow cycle with adjustable soft start between 0 and 250 ms with or without soft end Delayed firing of the 1st burst half cycle without soft operation for non saturating inductive and transformer connected loads Using external contact or external voltage on the control terminal block Response time enable 2 s inhibit 20 ms Two sockets for diagnostic unit used to set and control the thyristor unit using test signals True power Squared voltage Squared current Shielded cable connected to ground at both ends 0 5 mm to 2 5 mm wires Tightening 0 7 N m The control terminals are isolated from the power and the load circuit 470 User Manual 17 Identification Retransmissions Signal outputs Current limit optional Threshold limit Availability Power limit Threshold limit Instant load current Rectified full wave signal 0 to 2 5 V mean proportional to the real load current image True power 0 10 Vdc Load current 0 2 5 Vac Load voltage 0 2 5 Vac Maximum load current limit Setting using potentiometer on front panel Setting possible using an external potentiometer or an external voltage In Phase angle and Burst firing with soft start modes Limit of controlled parameter by the control system true power squared voltage or load current Setting using potentiometer on front panel Setting possibl
80. t by a quarter of a turn tilt the unit forwards to approximately 20 degrees from the horizontal free the unit from its backplate Warning AN Before dismounting the unit ensure that the heatsink is not hot Dangerous live parts may be accessible if the unit is dismounted when the thyristor unit is switched on The thyristor units can be controlled by an external analogue signal from a controller or another signal source or manually by an external potentiometer connected to the control terminal block Important The control inputs are isolated by transformers from the auxiliary supply voltage and from the power section Safety quench If the unit is unplugged from its backplate the operation of the thyristor unit is stopped Terminals 21 and 22 on the driver terminal block which must be connected together are the first two terminals to be disconnected from the backplate which instantly 10 ms maximum causes the thyristor unit output power to be reset Inhibit Inhibit indicates that thyristor firing is not possible irrespective of the control signal The inhibit is effective when a DC voltage is set on terminal 16 The inhibit voltage must be between 4 V and 32 V with reference to terminal 6 0 V Firing can be inhibited by connecting terminal 16 to terminal 12 10 V on the same control terminal block To deactivate the inhibit simply do not connect terminal 16 or set it to a DC voltage between
81. tection fuses ssss 7 4 S IVICING E weal atin een aan TE aia 7 5 T00lS 2 si estre Ot secnseteed de achoesnesadinscebastsbeuseasezen 7 6 470 User Manual 1 Maintenance Chapter 7 MAINTENANCE Warning The thyristor unit must be maintained by qualified personnel authorised to perform work in a low voltage industrial electrical environment THYRISTOR PROTECTION The thyristors of the 470 series power units are protected as follows the internal high speed fuse against over currents the RC snubber circuit and the varistor against excessively fast voltage variations and transient over voltages when the thyristors are not firing the thermal switch for the 471 model and for the external thyristor block 472 model In the event of accidental overheating of the cooler or if the fan stops the thermal switch opens which causes the thyristor firing to be stopped Warning The internal thyristor protection fuse 470 and 471 models does not protect the installation in any circumstances The external thyristors driven by the driver unit 472 model should be protected by following the connection and safety instructions in the thyristor block manual The user s installation must be protected upstream non high speed fuse thermal or electromagnetic circuit breaker appropriate fuse and fuse holder assembly and must comply with current standards 7 2 470 User Manual

470 User Manual issue 1 - Eurotherm by Schneider Electric

Contents

Download Pdf Manuals

Related Search

Related Contents