IIR - 4002 - ALM - Industrial Interface
Contents
1. EE gt Eye _ _ SS _ 4 2 Latching Operation Latching operation of relay 1 can be achieved by connecting link 9 Note that where latching operation is specified trip set point 2 is used to set the unlatch threshold such that Relay 2 is not independent Latching operation is not possible with relay 2 With Link 9 fitted Relay 1 can be set to energise when the process signal rises above or falls below trip set point 1 in the normal fashion At the same time LED 1 can be set to be on above or below set point 1 Once relay 1 has become energised it will remain energised so long as either the initial condition which caused the trip is sustained or whilst relay 2 is de energised or both i e relay 1 can only be latched whilst relay 2 is de energised and can only be unlatched whilst relay 2 is energised Note that LED1 denotes whether the process signal is above or below trip set point 1 not whether relay is energised By way of example the latching mode of operation is likely to be used to maintain the process signal between an upper and a lower limit for instance tank level control as shown in Figure 5 SET POINT 2 HYSTERESIS BAND ROCESS SIGNAL SET POINT 1 3 HYSTERESIS BAND RELAY 1 RELAY 2 LED 1 LED2 Fig 5 Timing Diagram Latching Operation Of 4002 ALM Trip 1 is set to option d section 4 1 Trip 2 is set to option b section 4 1 Trip set point 1 is set to the lower allowabl2. Trip point accuracy 0 25 range Hysteresis 1 full scale standard span gt 10mV 2 full scale standard span lt 10mV Cold junction compensation accuracy 2 C over operating temperature range0 5 C Process signal drift 100ppm full scale C Trip point drift 100ppm C Signal response time 90 of step change 300ms typical Relay response time 10ms typical 9 1 3 4002 ALM RTD Process signal linearity Trip point accuracy Hysteresis Process signal drift 0 1 range 0 25 range 1 full scale standard span 2 100 2 full scale standard span lt 1002 100ppm full scale C Trip point drift 100ppm C Signal response time 90 of step change 10ms typical Relay response time 10ms typical IIG 9506 04 Page 17 4002 ALM USER MANUAL 9 2 Retransmit Output Accuracy and Response with respect to 0 10v process signal all types Calibration accuracy at zero amp full scale 0 05 full scale Linearity 0 1 full scale Zero drift 50ppm full scale C Gain drift 100ppm C Gain dependance on load resistance Ry 10ppm W 0 Ry 750W Response time 90 of step change 30mS typical 9 3 Power Supply Isolation and Operating Ambient all 24v d c types Operating Voltage 24V DC 10 Current consumption 100mA typical dependent on configuration Input to output to power supply isolation 1kV DC Input output and power supply to relay contact 2kV RMS AC isolation O
3. and 11 and in the 3 wire case 12 also iv Adjust VR2 single turn potentiometer located towards front of daughter board to give 10 00V on voltmeter at full scale v Adjust VRI multi turn 10v potentiometer on daughter board to give 0 00V on voltmeter at zero scale vi Repeat iv and v as necessary vii Check for voltmeter reading of 5 00V at half scale input IIG 9506 04 Page 11 4002 ALM USER MANUAL Fig 6 4002 ALM HL Input Board Link Settings INPUT 0 10V 0 20mA 4 20mA L N L2 L3 1 Not Fitted 2 Fitted 2 Not Fitted vn vvl Fig 7 4002 ALM TC Input Board Link Settings L9 LINK NO POSITION FUNCTION DESCRIPTION 9 1 Upscale Burnout 9 2 Downscale Burnout Fig 8 4002 ALM RTD Input Board Link Settings L1 L2 13 14 L5 L6 L7 L8 L9 L10 L1 INPUT RTD Range 1 L1 L5 amp L9 Fitted RTD Range 2 L2 L6 amp L10 Fitted RTD Range 3 L3 L7 amp L11 Fitted RTD Range 4 L4 L8 amp L12 Fitted SENSOR CONNECTION 2 Wire L13 Fitted 3 Wire L13 Not Fitted Page 12 IIG 9506 04 4002 ALM USER MANUAL SS SSS SS SS ae ee ee ee 6 0 OUTPUT RECONFIGURATION RECONFIGURABLE OUTPUT UNITS ONLY AND CALIBRATION If the 4002 ALM has signal retransmission optional and has a reconfigurable output option reconfiguration can be carried out by changi
4. 4002 ALM USER MANUAL 4002 ALM DUAL TRIP AMPLIFIER WITH RE TRANSMITTED OUTPUT Whilst every effort has been taken to ensure the accuracy of this document we accept no responsibility for damage injury loss or expense resulting from errors or omissions and reserve the right of amendment without notice Industrial Interface Ltd This document is issued by Industrial Interface Ltd and may not be reproduced in any way without the prior written permission of the company IIG 9506 04 Page 1 4002 ALM USER MANUAL CONTENTS 1 0 INTRODUCTION 3 2 0 UNPACKING 6 3 0 CONNECTIONS 6 4 0 TRIP CONFIGURATION 8 5 0 INPUT RECONFIGURATION AND CALIBRATION 11 APPLIES TO RE CONFIGURABLE INPUT UNITS ONLY 6 0 OUTPUT RECONFIGURATION AND CALIBRATION 13 APPLIES TO RE CONFIGURABLE OUTPUT UNITS ONLY 7 0 SETTING TRIP POINTS 14 8 0 INSTALLATION 15 9 0 SPECIFICATIONS 17 Industrial Interface Ltd Signal House Unit 15 Alstone Lane Trading Estate Alstone Lane Cheltenham Gloucestershire GL51 8HF Tel 01242 251794 Fax 01242 571683 www industrialinterface co uk Page 2 IIG 9506 04 4002 ALM USER MANUAL 1 0 INTRODUCTION The 4002 ALM range is a family of configurable trip amplifiers capable of accepting a wide variety of electrical input types providing two trip action relay outputs and if required an isolated retransmission signal The family comprises three different products each accepting an input from a different type of sensor Input sig
5. ETPOINT 1 O TRIP POINT 2 O SETPOINT 2 O 1R 4002 ALM DUAL TRIP AMPLIFIER ISOLATED RETRANSMISSION OPTIONAL SETPOINT 1 PROCESS INPUT Cc SETPOINT 2 TRIP POINT 1 O SETPOINT 1 O TRIP POINT 2 O SETPOINT 2 O 1R 4002 ALM DUAL TRIP AMPLIFIER ISOLATED RETRANSMISSION OPTIONAL ISOLATED TRANSMITTER SUPPLY i AT o 10 11 12 13 14 Fig 3 4002 ALM Terminal amp Display Front Panel Connection Details Page 6 IIG 9506 04 4002 ALM USER MANUAL 3 1 3 2 Power Supply The power supply is connected into terminals 24 negative and 25 positive The supply voltage is indicated on the serial number label Figure 2 APPLICATION OF VOLTAGES HIGHER THAN THAT STATED FOR THE SUPPLY MAY CAUSE DAMAGE TO THE INSTRUMENT Sensor Connections All sensor connections are made to terminals numbered 10 11 amp 12 on the instrument The inputs are connected as described below DC Voltage Inputs This applies to the high level input device only IIR 4002 ALM HL The signal should be connected between terminals 11 positive and 10 negative DC Current Inputs This applies to the high level input device only IIR 4002 ALM HL The signal should be connected between terminals 11 positive and 10 negative If the transmitter supply option is fitted connect transmitter positive to terminal 14 transmitter negative to terminal 11 and link terminals 10 amp 13 Thermocouple Inputs This appl
6. IIG 9506 04 Page 5 4002 ALM USER MANUAL GOD 2 0 UNPACKING Please inspect the instrument carefully for signs of shipping damage The unit is packaged to give maximum protection but we can not guarantee that undue mishandling will not have damaged the instrument In the case of this unlikely event please contact your supplier immediately and retain the packaging for our subseguent inspection 2 1 Checking the Unit Type Fach unit has a unigue serial number label on which full details of the configuration are given see Figure 2 for example These details should be checked to ensure conformance with your reguirement Industrial Interface PART NUMEER 4002 HL INPUT 4 20mA RETRANSMISSION 4 20mA SUPPLY 24y DC RELAY 1 ENERGISED ABOVE SETPOINT RELAY 2 ENERGISED BELOW SETPOINT OPTIONS RECONFIGURABLE TRIP ACTION O STOCK No H493 078 RELAY 2 RELAY 1 Fig 2 Serial Number Label 3 0 CONNECTIONS This section details the instrument connection information Relay amp power connection details are also shown on the serial number label on each unit see figure 2 Input amp output connection details are shown on the front panel see figure 3 o a is aa et 1 1 OUTPUT OUTPUT ZERO O span ZERO O span POWER Industrial Interface O O O MONITOR ndustrial Zoe ge interface SETPOINT 1 PROCESS INPUT Cc SETPOINT 2 TRIP POINT 1 O S
7. ON Fig 10 Installation Data amp Terminal Positions For 4002 ALM Installation Data Mounting DIN Rail TS35 TS32 Orientation Any Vertical Preferred Connections 2 Part Screw Clamp With Pressure Plate Conductor Size 0 5mm 4 0 mm Insulation Stripping 6mm Screw Terminal Torque 0 4Nm Max Weight 210g approx d c supply 360g approx a c supply pin XE 00000 IIG 9506 04 Page 15 4002 ALM USER MANUAL 8 1 8 2 8 3 Installation onto Rails The instrument is designed to mount directly onto either the G TS32 standard assembly rail to DIN 46277 part 1 EN50035 BS5825 or the Top hat TS35 standard assembly rail to DIN46277 part 3 EN 50022 BS5584 The specially designed enclosure incorporates a universal foot assembly which uses the elastic properties of the moulded material to form a spring clip Mounting Arrangements Ideally the unit should be mounted in a vertical position i e on a horizontal rail This is the optimum orientation to minimise temperature rise within the unit However successful operation is possible in any orientation Ensure the maximum ambient temperature is less than 55 C Good airflow around the unit will maximise reliability Wiring Precautions These units can accept a variety of sensor inputs some of which produce very small voltages Therefore it is advisable to adhere to the following rules of good installation practice 1 Do
8. atic for other ranges v Adjust VRI located towards front of daughter board to give 10 00V on voltmeter at full scale vi Repeat iv and v as necessary N B If unit has LED display option fitted a voltmeter is not necessary instead adjust VR2 for 0 and VRI for 100 readings respectively 4002 ALM TC Reconfiguration and Calibration 1 Referring to 4002 ALM TC link setting diagram figure 7 set link 9 to the appropriatte sensor burnout action 11 Connect voltmeter between front panel terminals and set selector switch to centre process position 111 Ensuring that the cold junction compensation temperature is equal to the 4002 TC terminal temperature connect a thermocouple simulator to terminals 10 ve and 11 ve iv Adjust VR2 located towards rear of daughter board to give 10 00V on voltmeter at full scale N B Do not adjust VR1 located towards front of daughter board This is for servicing purposes only 4002 ALM RTD Reconfiguration and Calibration 1 Referring to the 4002 ALM RTD link setting diagram figure 8 select range 1 2 3 or 4 as detailed on unit side label as follows RANGE LINKS FITTED 1 1 5 9 2 2 6 10 3 3 7 11 4 4 8 12 Cake 11 Connect voltmeter between front panel terminals and set selector switch to centre process position 111 Ensuring that lead resistance is minimised 2 wire connection or egual 3 wire connection connect an RTD simulator or resistance box to terminals 10
9. ctory but is only possible with a 2 wire connection Reconfigurable input option A user reconfigurable input version of the product can be specified covering any 4 RTD resistance combinations see section 5 Output types amp ranges If required any 4002 ALM unit can be fitted with a retransmission output board with the following standard ranges i 0 1V 11 0 10V iii 0 20mA current source iv 4 20mA current source Other ranges are possible please consult Industrial Interface if required Reconfigurable output option A user reconfigurable output version of the product can be specified covering all of the above standard ranges see section 6 Power supply Low voltage DC version Standard power supply requirement is for 24V dc 10 for specified performance 5V dc 12V dc amp 24V ac supplies can be catered for by special request please consult Industrial Interface if required Unit specification I supply max No retransmission No transmitter supply No display 50mA Additional reguirement for current source output jan 50mA Either or Additional requirement for buffered voltage source output 70mA Additional requirement for transmitter supply 40mA Additional requirement for LED display 50mA This unit is internally protected by a resetting fuse and zener clamp Page 4 IIG 9506 04 4002 ALM USER MANUAL brnc u O r lM 1 3 2 Mains voltage a c version Standard power supply requirement is
10. e limit Trip set point 2 is set to the upper allowable limit When the process signal is below set point 1 relay 1 is energised latched and will remain energised until the signal reaches set point 2 At this point relay 1 is unlatched by relay 2 energising As the process signal reduces relay 2 de energises As the signal falls below set point 1 relay 1 is energised latched again and the cycle repeats The LEDs can be used to indicate the status as follows LEDI LED2 STATUS OFF OFF Power Fail OFF ON At or below bottom unit ON OFF At or above top limit ON ON Within limits SS 11111T1rr1111 11rri lt 3 Page 10 IIG 9506 04 4002 ALM USER MANUAL 5 0 5 1 5 2 5 3 INPUT RECONFIGURATION RECONFIGURABLE INPUT UNITS ONLY AND CALIBRATION If the 4002 ALM has a reconfigurable input option reconfiguration can be carried out by changing handbag links on the input daughter board and for greatest accuracy recalibrating the 0 10V process signal 4002 ALM HL Reconfiguration and Calibration 1 Referring to 4002 ALM HL link setting diagram figure 6 set links 1 through 4 as required 11 Connect voltmeter between front panel terminals and set selector switch to centre process position iii Connect a current or voltage source as appropriate to input terminals 10 ve and 11 ve iv Adjust VR2 located towards rear of daughter board to give 0 00V on voltmeter at zero scale for 4 20mA range only zero is autom
11. ess signal is not linearised For standard thermocouples the operating range will be specified in C or F as required In general the limits on signals that can be handled with the accuracy specified in section 8 are FULL SCALE INPUT MIN NOTES mV 4mV 100mV ND TW N 150 C 1300 C R 460 C 1768 C S 480 C 1760 C 910 C 1820 C COLD JUNCTION COMPENSATION WILL NOT BE FITTED IIG 9506 04 Page 3 4002 ALM USER MANUAL 1 1 2 1 1 1 3 1 1 2 13 N B Reconfigurable input option A reconfigurable version of the product is not currently available although upscale or downscale burnout is user selectable 4002 ALM RTD Accepts inputs from resistance thermometers such as the PT100 type in 2 or 3 wire configuration Additionally 2 wire potentiometers less than 1K ohm can be accommodated In general the measured resistance can be anywhere between zero and 1Kohm and standard curves such as PT100 can be linearised The minimum span must be 10 ohm for the accuracy specified in section 8 which corresponds to roughly 30 C for a PT100 sensor For standard RTD sensor types the operating range will be specified in C and the process signal will be linearised otherwise the range will be specified in ohms without linearisation 2 or 3 wire connection is link selectable see section 4 factory default setting is 3 wire Downscale drive on wire break detection is standard upscale drive can be specially requested from the fa
12. for 240V ac 10 or 115v ac 10 The voltage is preset at the factory though a selector switch is fitted internally Max power consumption is 4VA N B This unit is internally protected by a transient absorbing varistor and a 100mA quick blow fuse 1 4 Description of operation The input stage of the 4002 ALM produces an internal process signal of 0 10V DC corresponding to the input span This signal can be measured between the front panel test pins of the unit with the selector switch in the centre process position The trip set point potentiometers produce set point signals of 0 10V DC corresponding to the input span These signals can be measured between the front panel test pins of the unit with the selector switch in the upper set 1 or lower set 2 position Internal circuitry compares the process signal with each of the set point levels and changes the state of the output relays and indicator LED s as the signal passes through the set point the exact action being factory or user configurable see section 4 A hysteresis band typically 1 of span unless specifically requested around each set point ensures chatter free trip operation A block schematic diagram of the 4002 ALM is shown in Figure 1 Power input Optional display 2 O 4002 ALM Trip Amplifier p 1O Output Isolation Optional Retransmission 18 19 20 OOO Relay 1 Relay 2 FIG 1 BLOCK SCHEMATIC DIAGRAM FOR THE IIR 4002 ALM TRIP AMPLIFIER
13. ies to the thermocouple input device only IIR 4002 ALM TC Thermocouples or mV sources are connected to input terminals 10 negative and 11 positive The cold junction compensation where appropriate is performed by an integral sensor located close and thermally connected to the input terminal RTD Inputs This applies to the resistance thermometer input device only IIR 4002 ALM RTD RTD s should be connected using three identical wires in order that measurement errors due to lead wire resistances can be eliminated The sensor common wires should be connected to terminals 10 amp 12 the remaining wire going to terminal 11 If it is necessary to use a two wire sensor then it should be connected between terminals 10 and 11 and an internal link should be fitted see section 4 0 Trip Configuration alternatively terminals 10 amp 12 can be externally linked 2 wire transmitter IIG 9506 04 Page 7 4002 ALM USER MANUAL 4 0 4 1 TRIP CONFIGURATION Standard non latching operation The action of each trip can be simply described by considering the state of the relevant relay and LED indicator with process signal either side of the trip set point The options for each trip are as follows a Relay energised for process signal above set LED on for process signal above set point b n energised for process signal above set LED off for process signal above set point c Relay energised for process signal below set LED on for proce
14. nal output signal trip configuration and power supply information are required to define any unit exactly This information together with a unique serial number is printed on the side label of each unit records of the exact configuration of every product shipped are maintained at the factory 1 1 Input Types And Ranges 1 1 1 4002 ALM HL Accepts either DC voltage or current i e high level inputs In general the limits on signals that can be handled with the accuracy specified in section 8 are FULL SCALE INPUT MIN SPAN NOTES DC CURRENT 50 FULL SCALE MAX VOLTAGE DROP 0 33V DC VOLTAGE 100mV 300V 50 FULL SCALE 10K ohm lt R in lt 10M ohm USE 4002 TC FOR Vin lt 100mV All the standard process ranges such as 0 10mA 4 20mA 0 20mA 1 5V and 0 10V are of course covered 1 1 1 1 Reconfigurable input option A user reconfigurable input version of the product can be specified covering 0 20mA 4 20mA and 0 10V inputs see section 5 1 1 2 4002 ALM TC Accepts inputs directly from the following thermocouple types J K N T R B E U Land S Alternatively a mV input may be specified All specified ranges are zero referred i e 0 F 0 C or 0mV although negative inputs will not damage the unit Automatic cold junction compensation will be fitted to thermocouple units for which either upscale or downscale drive on break detection are link selectable see section 4 factory default setting is upscale The proc
15. ng handbag links on the output daughter board and recalibrating the output signal 1 Refering to 4002 ALM OP link setting diagram figure 9 set links 1 to 7 as required 11 With appropriate zero scale signal input to the unit which should result in a voltage of 0 00v on the front panel terminals with the selector switch in the centre process position adjust the output zero potentiometer VRI located at the top of the Output daughter board for the appropriate zero scale output value 111 With appropriate full scale signal input to the unit which should result in a voltage of 10 00v on the front panel terminals with the selector switch in the centre process position adjust the output span potentiometer VR2 located at the bottom of the Output daughter board for the appropriate full scale output value N B Current output units are factory calibrated into 2500hm load iv Repeat steps ii and iii as necessary Fig 9 4002 ALM Output Board Link Settings OUTPUT TYPE Ll L2 L5 L6 L7 0 1V feck D 0 10V 0 20mA 4 20mA N B Links 3 amp 4 are factory fitted where output signal isolation is not required IIG 9506 04 Page 13 4002 ALM USER MANUAL 7 0 7 1 e g 7 2 7 3 e g SETTING TRIP POINTS The trip poi
16. not install close to switchgear electromagnetic starters connectors power units or motors 11 Do not have power or control wiring in the same loom as sensor wires 111 Use screened cable for sensor wiring with the screen earthed at one end only iv Take care not to allow cut pieces of wire to fall onto the unit as they might enter via the ventilation holes and cause electrical short circuits If in doubt remove the units from the rail until wiring is complete v Use bootlace ferrules on all bare wires IMPORTANT The connection terminals are designed for a maximum torque of 0 4Nm Exceeding this figure is unnecessary and will result in unwarrantable damage to the unit Page 16 IIG 9506 04 4002 ALM USER MANUAL ee e EEEE gt E gt E gt gt yyyyeyyeI I _ _i_______ lt 9 0 SPECIFICATIONS All specifications are at 20 C operating ambient with 250ohm output load current output unless otherwise stated 9 1 Input Trip Accuracy and Response 9 1 1 4002 ALM HL Process signal linearity 0 1 full scale Trip point accuracy 0 25 range Hysteresis 1 full scale standard Process signal drift 100ppm full scale C Trip point drift 100ppm C Signal Response Time 90 of step change 2ms typical Relay response time 10ms typical 9 1 2 4002 ALM TC Process signal linearity with respect to thermocouple 0 1 full scale voltage
17. nts can be measured between the front panel terminals with the selector switch in the appropriate position The measured signal is a voltage between 0 and 10V corresponding to the input range of the unit If the LED display option is fitted a 0 100 reading is obtained 4002 ALM HL Trip Points Since the 0 10V process signal is linear for this device the trip point is equal to 100 of span multiplied by the set point voltage 4 20mA input trip at 16mA input 75 of span therefore trip set point 7 5V 4002 ALM TC Trip Points Since the 0 10V process signal is linear with respect to thermocouple voltage and not degrees the set point must be calculated as follows 1 Look up full scale thermocouple millivolts from table X 11 Look up millivolt output for required trip point Y 111 Set 0 10V indication for Y X volts e g a 0 1200 C type K 1200 C 48 828mV b Require trip above 900 C 900 C 37 325mV c Set point will be 37 325 x 10v 7 64V 48 828 Unit will then trip on at 900 C and off at 900 Z C where Z is hysteresis band Hysteresis is typically 1 of span unless otherwise specified 4002 ALM RTD Trip Points Since the 0 10V process signal is linear for this device the trip point is equal to 100 of span multiplied by the set point voltage 100 to 200 C PT 100 input trip at 100 C 67 of span therefore trip set point 6 7V Page 14 IIG 9506 04 4002 ALM USER MANUAL Ee 8 0 INSTALLATI
18. perating temperature range 0 55 C Storage temperature range 40 100 C Operating and storage humidity range 0 90 RH Both relays energised overscale re transmission no transmitter supply or LED display 9 4 EMC Performance EMC BS EN61326 LVD Standards EN61010 1 Installation Category IEC 664 II Pollution Degree EN61010 1 2 Eguipment Class IEC 536 II Page 18 IIG 9506 04
19. ss signal below set point d aes energised for process signal below set LED off for process signal below set point point Thus any combination of fail safe or non fail safe options can be catered for Factory Pre Configured Units Where the unit is required for a preset trip configuration this can be requested at time of order and will be carried out free of charge at the factory In this case the following convention corresponding to option a to d above is used for specifying operation a RLY x gt SP x lt LED x b RLY x gt SP x gt LED x Where x 1 for trip 1 c RLY x lt SP x gt LED x x 2fortrip2 d RLY x lt SP x lt LED x This information will appear on the serial number side label on pre configured units figure 2 It is helpful if this convention is used by the customer when specifying units Default Configuration In the event that pre configuration information is not available units will be shipped in default configuration as follows RLY 1 gt SP1 lt LED 1 case a section 4 1 RLY 2 lt SP2 gt LED 2 case c section 4 1 User Configuration If it is necessary to change the trip action of the instrument or to change the wire break detection 4002 ALM TC only or 2 3 wire sensor connection 4002 ALM RTD only the two halves of the plastic enclosure must be separated This is achieved by using a fine bladed screwdriver as follows Place the blade in each of the seven slots in turn in the wide half of the enclos
20. ure the half with the serial number label attached holding the blade flat towards the outside of the unit whilst levering the screwdriver handle towards the outside of the unit thereby releasing the catch gently prise apart the two halves of the casing with the thumb and forefinger on the other hand This procedure is best carried out starting with the slot at the top right hand corner of the side label and working anti clockwise around the remaining slots The trip action of the unit may then be configured by changing the handbag links with reference to figure 4 Wire break detection 4002 ALM TC only and 2 3 wire sensor connection 4002 ALM RTD only link settings are shown in section 5 Page 8 IIG 9506 04 LINK SET NO Links 1 and 2 Links 1 and 2 Links 3 and 4 Links 3 and 4 Links 5 and 6 Links 5 and 6 Links 7 and 8 Links 7 and 8 Link 9 4002 ALM USER MANUAL Fig 4 4002 ALM Mother board Link Settings POSITION 1 2 2 fitted FUNCTION DESCRIPTION Relay 1 energised Above Setpoint Relay energised Below Setpoint Relay 2 energised Below Setpoint Relay 2 energised Above Setpoint LEDI Off when Relay 1 energised LED1 On when Relay 1 energised LED2 On when Relay 2 energised LED2 Off when Relay 2 energised Relay Latching Function IIG 9506 04 Page 9 4002 ALM USER MANUAL S EE a ESE _ gt gt gt E gt gt E gt EL_ gt
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