Eurotherm 93 Installation & Operations Manual
Contents
1. ALARM 2 line 2a Closed in alarm ALARM 1 Open in alarm Relay 100 240Vac 10 15 50 or 60Hz pp x nm Com m _ _ Am om _ neutral WARNING Ensure that the maximum voltage which is ap plied to the unit power supply between any two isolated cir cuits or between any isolated circuit and ground does not ex ceed 264Vac Power Respect the polarity of the AC power supply line wire must be connected to terminal 12 and the neutral must be connected to ter minal 11 Alarm relay s The alarm outputs are failsafe the relays are de energized dur ing the alarm condition or power down The attached alarm circuit should be designed for failsafe operation and fused appropriate ly A snubber may be required see below Snubbers Connect snubbers CZ 140 398 22nf 100Q across the appro priate alarm relay contacts when driving AC inductive loads me chanical contactors and sole noids Do not use snubbers when driving high impedance loads The snubber passes 1mA in 120Vac circuits and 2mA in 240Vac circuits this is sufficient to hold in certain relays with high impedance coils and should not be used in such installations T C WARNING When an alarm con tact is to be implemented as part of a failsafe alarm scheme it is the user s responsibility to verify that the effect of the snubber does not interfere with the opera2. C e Linear b point and span scal ing configuration code D Linear a and Linear b 1 Set display decimal point po sition parameter dP to desired value 2 If reading the input signal di rectly from the source connect source from signal generator or sensor to input terminals Apply a signal equal to a Known low value for the first setup point 3 Scroll through the protected list until In Lo Press and hold on Aor Y until rEAd appears re lease then push the button again Alternatively if no input signal is required or the exact value is known the input value in millivolts can be set in with A or V LINEAR INPUT SCALING 4 Scroll todSLo Then set in the corresponding display value with A or V Linear a only 5 Again if reading the input sig nal directly from the source apply a signal equal to a known high value for the second setup point 6 Scroll through the protects list until In Hi Press on Aor until rEAd appears release then push the button again Alternatively if dSHi L Z p e gt gt amp amp o o 2 D USLo a In Lo In Hi input mV Linear a 2 point scaling no input signal is required or the exact value is known the input value in millivolts can be set in with A or V 7 Access dSHi Then set in the corresponding display value with Aorv Linear b only 8 Access In Sn With A or V set in the input signal span in milli volts 9 Access d
3. figuration is correct Personal inju ry property loss and equipment damage could result from an im properly configured instrument GROUNDING This instrument has internal cir cuits which are isolated or float ing This is necessary to prevent the occurrence of a ground loop in signal circuits To avoid possi ble shock hazards in the event of an internal fault causing break down of insulation it is recom mended that all equipment con nected to this unit be enclosed in a grounded metal enclosure Sheaths of thermocouples or other sensors should be properly grounded by a separate conduc tor instead of being dependent on grounding via the machine framework ESD PRECAUTIONS This instrument contains static sensitive components Care should be taken to avoid electro static discharge ESD and thus reduce incidents of damage to the instrument when removed from its sleeve Any manipulation of an unsleeved instrument should be performed on a conductive sur face with the personnel in contact with the surface by means of a grounded metal or conductive plastic wrist strap with a 1MQ se ries resistor SUPPLY ISOLATORS Every electrical system should be provided with means for isolating the system from the AC supply to allow safe working during repair and maintenance SCRs and triacs are not adequate means of isolating the supply and should always be backed by a suitable then press the button again Both
4. connections Message FAIL value outside of configured range disappears when input signal is reinstated flashing Display overrange or out of specified accuracy Unit should not be used in this range value range SELF DIAGNOSTIC MESSAGES Internal self test upon power up Replace unit if all four 1 s do not light up or fails to go on to 8888 display Do not touch front panel during self test 8888 Display test after above self test Lasts for User should verify that all digits and lamps light EE Memory corruption Cycle power Verify and correct all parameter and configuration values If display persists replace unit Id Unit failure Replace unit FAIL Please note the following e Conductive pollution such as carbon dust must be excluded from the cabinet in which the instrument is mounted e Any voltage transients that occur on power supply lines isolated inputs or outputs must not exceed 2 5V in series or com mon mode If occational voltage transients of 2 5kV or higher are expected or measured transient limiting devices should be part of installation LINEAR INPUT SETUP Electrical connections For all inputs use a shielded twist ed pair e Millivolt inputs 10 to 70mV Connect signal leads directly to input terminals 9 and 10 0 20mA and 4 20mA inputs Connect 3 01 shunt part no CA 9G3 R01 across input terminals 9 and 10 e Higher voltage inputs Voltage divider network is required
5. linear a and b inputs Linear a inputs only To read input signal value from rear terminals See procedure for In Lo above Linear a inputs only Linear b inputs only Linear b inputs only mechanical disconnect switch HAZARDOUS ATMOSPHERES This unit is not suitable for use in areas subject to hazardous atmos pheres No Eurotherm product should be connected to a circuit which passes into or through a hazardous area unless appropri ate precautions are taken even though the instrument itself may be located in a safe area Such an installation should conform to the requirements of the relevant Authority In the USA Factory Mutual Research Corporation and Underwriters Laboratories Inc PROCEDURE IN THE EVENT OF TROUBLE Before beginning any investigation of a fault the electrical supplies to all equipment concerned should be switched off and isolated Units suspected of being faulty should be disconnected and removed to a properly equipped workshop for testing There are no user servicable parts inside this unit 1990 93 96 Eurotherm Controls Inc All rights reserved Doc HA133642 Issue 3 9608
6. once to view dis play units e Depress again to view AL 1 Push A or to view alarm 1 setpoint e Depress again to view AL 2 Push A or to view alarm 2 setpoint To acknowledge or reset latching alarms flashing red AL1 or AL2 lamp use until AL 1 AL 2 appears Then do either Method Hold A or for 5 sec onds until Clr appears release then press the button again Method 2 Use secret key Protected list procedures To enter protected list use until units display F C or Lin then secret key Continue with to view parameter mnemonics Push A or to view parame ter value Push A or W again to modify parameter value To return to measured value display use secret key NOTE Parameters not pertinent to the unit configuration do not ap pear in the scroll list display alarm 1 active alarm 2 active decrease value DOWN button next parameter increase value UP button secret key EUROTHERM LIMIT SWITCH OPERATION Temperature and process alarms If the measured value enters an alarm condition defined by the configuration code and the pa rameter values then the appro priate red lamp AL1 or AL2 lights and the corresponding relay de energizes The limit switch opera tion is always latching NOTE Deviation alarm setpoints d 1 and d 2 are in reference to the alarm setpoints AL 1 and AL 2 Examples deviation low alarm s
7. resis tors supplied by user Refer to table for suggested values Resis tor specifications 1 0 125W minimum 100ppm metal or metal oxide film CAUTION Use of the shunt or voltage divider inhibits opera tion of the sensor break detec tion feature Nominal range R 20 to 200mV 2 2kQ 0 1to1V 15 0kQ 0 5 to 5V 75 0kQ 1 to 10V 150kQ 2 5 to 25V 392kQ CAUTION Before installing operating or ser vicing this unit supplied by Eurotherm please read the fol lowing INSTRUCTIONS FOR SAFE USE OF EUROTHERM EQUIPMENT Note These instructions repre sent good engineering principles and are applicable to all control equipment of the same type whether from Eurotherm or any other supplier ENCLOSURE OF LIVE PARTS This unit should be installed in side a suitable grounded metal enclosure to prevent live parts being accessible to human hands and metal tools It is recommend ed that rear terminal covers avail able as an option be fitted WIRING It is important to connect the unit correctly in accordance with the installation data on this sheet Wiring should conform to appro priate standards of good practice and local codes and regulations Conductors should be commen surate with voltage and current ratings of the units OUT OF LIMITS ALARMS In applications where excessive Scaling procedure There are 2 methods for entering and scaling linear inputs e Linear a 2 point scaling con figuration code
8. Installation and Operation Manual CE UL Uy Model 93 Temperature limit switch Features marked with an asterisk are available only on units manufactured after January 1993 Version 1 2 2 Electrical connections 1 Mechanical installation Prepare panel cutout e Install the optional front panel gasket part no BO 133 297 if required Remove the backing from the gasket and apply it around the panel cutout on the outside of the panel e Slide instrument sleeve into the cutout from the front of the panel e Position the mounting bracket on the rear of the instrument sleeve with the 2 clips facing the rear and positioned on the top and bottom of the sleeve e While holding the sleeve slide the mounting bracket towards the panel until the clips engage on the ratchets While still pull ing back on the sleeve press on the upper left and lower right hand corners of the brack et to seat the mounting brack et Another push on the clips ane 48mm omy 2 32 min 59mm min gt 1 77x 1 77 0 02 0 00 45x 0 6 45mm 0 0 Ro 020 ERP 3 27 min R0 5mm 83mm min max radii JE Panel cutout and minimum spacing Max panel thickness 0 51 13mm with a screwdriver might be necessary to secure the instal lation 4 81 122 1mm Dimensions Panel depth with rear terminal cover 4 96 126 1mm with gasket fitted less 0 060 1 5mm Relay Open in alarm
9. SSn With A or Y ISLo se t in th dSSn e In Sn In Lo input mV Linear b point amp span scaling Replaces OFSt parameter in protected list 9 99 to 70 00mV input signal range Both linear a and b inputs To read input signal value from rear terminals Hold UP or DOWN until rEAd appears release Input for low setup point dSLo Display value for low 999 to 9999 99 9 to 999 9 or setup point 9 99 to 99 99 process units Input for high setup point 9 99 to 70 00mV input signal range Display value for high 999 to 9999 99 9 to 999 9 or setup point 9 99 to 99 99 process units In Sn Input signal span 0 00 to 70 00mv Display span 999 to 9999 99 9 to 999 9 or 9 99 to 99 99 process units deviation of a controlled parame ter due to equipment failure could cause damage to machinery or materials or injury to personnel it is strongly recommended that an additional separate unit with its own input sensor be used to give alarm indication or to shut down the process or both as may be appropriate Note The alarm function built into controllers may not give sufficient protection in these circumstances When the controller alarm function or separ ate alarm units are used they should be checked for correct op eration at regular intervals CONFIGURATION Many instrument functions are user selectable from the front panel It is the user s responsibility to verify that the instrument con
10. amp steady ON lamp OFF relay de energized relay energized Power fail alarm Adjustable parameters Manual reset after power resto ration If the power fail alarm is Mnemonic Parameter Adjustable range selected one of the yes selec tions for configuration code digit OPEN LIST 4 the limit switch always places Display units Display units selected in configuration both relays in the alarm state de View only To acknowledge latching alarms Hold energized upon powering up A UP or DOWN button until CLr appears manual reset by the operator is ec ae ene ol release then press the button again thus required to re energize the Value adjustable in protected list below alarm output relays These alarms are acknowledged as all others in the open list or by the remote pushbutton Automatic reset after power res toration If the power fail alarm is not selected one of the no se lections for configuration code digit 4 the limit switch automati cally re affirms any alarm existing before the power failure Alarm test HY 1 Alarm 1 hysteresis 1 C or 1 F to upper range limit To test the operation of the output Linear inputs 1 to 9999 0 1 to relays and the connected circuit 999 9 0 01 to 99 99 scroll to the appropriate alarm Deviation alarm offset 1 C or 1 F to upper range limit Appears for deviation configurations only from AL1 Linear inputs 1 to 9999 0 1 to For deviation band alarm
11. etpoint AL 2 d 2 deviation high alarm setpoint AL 1 d 1 deviation band alarm setpoints AL 2 d 2 Resetting acknowledging alarms Alarms are acknowledged in the open list see Open list proce dures or by a remote pushbut ton Active NOTE The remote pushbutton can be configured to acknowledge only AL1 only AL2 or both Sensor fail alarm Sensor fail detection is always op erative The unit displays SnSr FAIL upon detecting at least one of these conditions e if the input signal is less than 40mV or greater than 90mV e if the input is open circuit or e if the unit s temperature is out side of the 0 55 C operating range thermocouple inputs only The behavior of the relays and the alarm lamps AL1 and AL2 con forms to the table below NOTE Selection of configuration code 5 for digits 1 or 2 enables the alarm relay operation only for sensor fail alarm and power fail alarm if enabled and not for any process alarm condition Alarm condition Cleared Before resetting unacknowledged 1st digit 6 full scale absolute high latching alarm AL 1 2nd digit 6 full scale absolute high latching alarm AL 2 3rd digit 4 type J thermocouple input 4th digit 6 display units in F remote alarm acknowledgement for both alarms and power fail alarm disabled lamp flashing lamp flashing relay de energized relay de energized After resetting acknowledged l
12. s HY1 999 9 0 01 to 99 99 must be less than d 1 PROTECTED LIST Configuration code id Instrument model ident View only 93 Decimal point position 0 to 2 decimal places Formats Appears for linear inputs only Affects all for linear inputs a and b XXXX XXX X or XX XX parameters displayed in process units AL 1 Alarm 1 setpoint Full scale alarm setpoints and Alarm function selected in configuration deviation alarm reference levels AL 1 setting irrelevant for sensor break configured input sensor range alarms configuration code 5 To test alarm operation Hold UP or DOWN button until tESt appears release then press the button again Alarm state should toggle AL1 or AL2 in the protected list and hold A or V until tESt ap pears Release then depress the Same as alarm 1 Same as alarm 1 button again to change the state of the relay if the relay is ener gized then the alarm test de from AL 2 energizes the relay and vice E cae aa 50 0 to 50 0 C Appears for temperature inputs only versa When the button is re 90 0 to 90 0 F leased the relay assumes the 50 Hertz 50 60 Hertz 60 Set to line frequency upon installation previous condition determined by the input Display messages Display condition User action comments INPUT STATUS MESSAGES SnSr Sensor fail Input open or reversed measured Verify input sensor and
13. tion of the circuit Cer tain high impedance circuits are not able to detect a contact opening when the snubber is placed across the contact In these cases the snubber should not be installed across the relay contact Reset input Connect momentary contact nor mally open pushbutton to termi nals 6 and 7 Keep wiring run shorter than 3 1m and well away from noise generating circuits Input WARNING This temperature limit switch must have its own input sensor Never connect the input terminals 9 and 10 in par allel with the input of any other instrument e g recorder con troller etc The parallelled in puts of other instruments inter fere with proper operation of the sensor break detection cir cuitry and may also impair the measurement accuracy NOTE The input circuit is NOT isolated from the reset input ter minals 6 and 7 Use of shielded twisted pair is RESET INPUT RTD 3 NOTE See p 4 for wiring of lin ear inputs recommended The shield must be connected to terminal 10 even when grounded elsewhere Thermocouple Use appropri ate compensation cable Keep loop resistance as low as pos sible 1kQ maximum RTD Use 3 copper wires of same length and diameter 3 Configuration Procedure 1 Cycle power OFF and ON Touch and hold secret key when 4 digit configuration code appears afterself test to enter configuration mode NOTE Touching the front panel during the start
14. up self test could lead to erroneous test results 2 See configuration code with left digit blinking Configuration code 1st left and 2nd digits alarm 1 and alarm 2 functions Disabled Deviation low alarm Deviation high alarm Deviation band alarm Full scale low alarm Sensor break alarm Full scale high alarm 3rd digit input sensor type RTD 100Q Pt DIN43760 B Pt 30 Rh Pt 6 Rh C W 5 Re W 26 Re Hoskins E Chromel Adams constantan J Fe SAMA constantan K Chromel Alumel L Fe Konstantan N NiCroSil NiSil Platinel 1I R Pt 13 Rh Pt S Pt 10 Rh Pt T Cu Adams constantan Linear a 2 point entry scaling Linear b point and span entry scaling TOWDpeMmnNounwn Ao 4th right digit display remote ack pwr fail alarm Configuration example 6646 20Q lead maximum resistance e Linear inputs see page 4 Rear terminal cover optional After wiring attach rear terminal cover BD133125 with screw FY133264U001 3 Enter new code refer to Config uration code table v select digit position 1 through 4 A modify digit value 4 To exit configuration mode do one of these Secret key accept new config uration parameter value check follows abort return to previous configuration full specified range min max min C max 4 Operation BASIC OPERATION Open list procedures e Measured value is displayed when unit is unattended e Depress
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