User Manual
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1. cil SSI 907 00 0 oN 2oq o Q Q es biq Aq ud 1 q addy ssi s yu 80 eS MAI ULd 4E M hLL Aiquiassy 2 821 1 313 OOW3 1841 WIM 2 13106 33 E siwu u o p l ls ss un WW u ase suolsu uiip V ww 022 d q ww 06 aif ufo 44 4 7 14 44 Sq ov 20 2 Ul WOD Xew 92 96 AOEZ OLL 92 96 Tal X vldi ut Woo uu di id XAV SAV ww 001 VA S 3 mod ON 46 14106 34 I POWN 5 AVM PLLO OSL 2811 879 092 163 191 58 1 414 wu 8 909 0004 Hey UEl fo uolsu uuid payloads jou 8 0 104 2 991 90 0090 90q ON BIG eq q ulq 14q uddy l eq ssi S VU lEOS Jenae N IA AUC 1001 Aqw ssy 2 821 0410313 0213 Id WIM MAW 153106 34 ONO jE siwu u o p l ls ss un WW u suolsu ulip V r Su s SOA si 4 YMS NO slndlonuoo 9 yod 3sn Pv idl 21 yy asiey slndlonuoo s Aerdsiq 141 TT 1 2081 5 4 4 stey jeuBisoug onuo2 Aey q awl 6 uone lpul2. sz pun 2 SHOA 4 MO01 8 Aeldsiq YAY T LMHTOC HH Id1 MA YAV 909 00dd 1HEuo E l fo uolsu uuid payloads jou seoueJa O 104 WARRANTY This product from EMCO ELECTRONICS is warranted against defects in materials and workmanship for a period of 12 months from the date of despatch to the first buyer purchaser of this equipment this being essentially limited by warranties given to EMCO ELECTRONICS on the component used in equipment During the warranty period EMCO ELECTRONICS will at its option either repair or replace the product which prove to be defective provided the product has been used with reasonable care and in accordance with the manuals product specification Consequently this warranty shall also not apply to defects damages in transit or resulting from misbehaving misuse unauthorised modifications or repairs operations outside the environmental electrical and or other specification improper or inadequate maintenance of the product or site conditions as required recommended and damages arising from accidental or abnormal causes The vvarranty period for items repaired replaced shall not exceed the period for which the equipment was originally vvarranted and also the liability of EMCO ELECTRONICS to the purchaser shall not in any case exceed the original purchase price of the equipment For warranty service or repair the equipmen
3. gt 12V 5v Top Adjust 12V gt 5V AA UV BLOCKING Controller Display VOLTAGE CIRCUIT DC SUPPLY VOLTAGE CIRCUIT AC DC CONVERTOR AND FILTER DC SUPPLY lt Option For Auxiliary Fail Alarm SMPS Z eZ DISPLAY A pair of NO contacts are provided on Terminal Block pins 8 amp 9 on the Rear Panel The contacts are open when the Auxiliary supply is present amp close when the Auxiliary supply fails SELECTOR SWITCH uv COMPARA UV DISPLAY PCB Option For 1 to 12 Secs amp Continuous Pulse SWITCH 1 Consider time delay setting Time Delay 10 i e 10 secs 1 sec amp 120 secs 12 secs ALL DIMENSIONS ARE IN mm UNLESS STATED OTHERWISE BLOCK DIAGRAM EMCO ELECTRONICS TITLE DRG No SCALE N T S DATE AVR EE 301ET ASSEMBLY MATERIAL PRODUCT DRN BY APPR BY 2 Instead of 2 secs ON pulse the contacts are continuously closed till the voltage is outside the bandwidth DATE 3 When PT amp Aux Supply 230 V All Settings amp display are corresponding to 230 V ISS DOC 0 00 405 155 1
4. R levels independently The Time Delay setting on the front panel eliminates the relay operations for momentary fluctuations of the regulated voltage thus reducing the number of operations of the tap changer When the regulated voltage falls below the specified Under Voltage limit the control relays are automatically blocked i e there is no voltage correction The relay uses all solid state circuitry which increases its reliability and life The relay is of draw out construction and the unit can be easily withdrawn from the case for servicing The output input connections are made through a terminal block However all normal precautions care in handling storage should be observed as for a sensitive electronic instrument GENERAL DESCRIPTION EMCO s Solid State Voltage Regulating Relay Type EE 301ET is designed for maximum operational simplicity for regulating the secondary voltage of power transformer with on load tap changer It also includes the Tap Position Indicator The dead band bandwidth can be set by setting the L 8 R limit as required The desired time delay can be set on the front panel and the control action will take place only if the voltage continues to remain outside the dead band after the time delay has elapsed For voltage corrections requiring more than one tap change time delay is initiated again before further tap change The relay is reset automatically after the voltage is brought within the selected deadband Op
5. to 5V AC when PT IP is varied from 0 to 150V AC If the voltage is not coming it means that the sense transformer is faulty Replace the sense transformer If the voltage is OK check 7 5V DC on TP6 for PT IP 110V If DC voltage is not OK then IC1 is faulty If it is OK then either selector switch on Display PCB is faulty or IC10 is faulty Replace the faulty component Vary the PT I P to less than 80V UV level then the UV indication alongwith R indication should come Increase the voltage above 85V then UV command goes off However R command remains ON Increase PT I P voltage slightly more than 108V R will go off This is Bandwidth condition Increase PT I P slightly more than 112V L indication should come If the UV L amp R indications are coming as above that means Display PCB is OK Set Time Delay TD control to 30 sec Vary the PT I P to get L condition Measure time from which L indication comes to the time LR indication comes The LR indication will remain ON for 2 sec after which once again TD is initiated The TD indication is provided on Main PCB Similarly get R condition amp RR should come after set Time Delay If LR amp RR indications are not coming after set time delay it means Main PCB or TD pot is faulty Replace the faulty component If RR amp LR indications are coming but relays are no
6. AMILIARIZATION WITH VARIOUS INDICATIONS CONTROLS A INDICATIONS Auxiliary Supply ON L LED R LED UV LED LR LED RR LED Display digits light ON whenever the PT Voltage exceeds the LOWER VOLTS set limit ON whenever the PT voltage falls below the RAISE VOLTS set limit ON whenever the PT Voltage falls below the factory set Undrvoltage limit i e below 80V This LED will turn off only when the PT voltage rises above 85V This LED will be ON when P T supply fails ON When Lower Relay is energised ON When Raise Relay is energised CONTROLS 1 Power ON 2 R Set 3 117 Set 4 Time Delay 5 Selector Switch 6 TPI Adjust OPERATING INSTRUCTION This is a toggle switch which when ON supplies Auxiliary Voltage amp PT voltage to the instrument Note TPI Aux Supply is independent and is not controlled by this switch This is avariable control varying from 90Vto120V This control sets the lower limit of the PT voltage below which if the voltage reduces then corrective action will be taken by the instrument The setting can be read on display Thisis a variable control varying from95Vto 125V This control sets the upper limit of the PT voltage beyond which if the voltage rises corrective action will be taken by the instrument The setting can be read on display Corrective action takes place on
7. EMCO Instruction Manual for ELECTRONICS Automatic ISO 9001 2008 Cert Co Voltage Regulating Relay Type EE 301ET Automatic Voltage Regulating Relay EE 301ET EMCO ELECTRONICS Works Unit No 13 Kedarnath Tungareshwar Industrial Complex No 1 Village Sativali Vasai E Dist Thane 401208 Tel 91 250 648 1804 1782 0114 Fax 91 250 2481087 Email mumbai emcoelectronics org sales emcoelectronics gmail com 302 Vasan Udyog Bhavan Sanapati Bapat Marg Opp Phoenix mill Big Bazar Lower Parel W Mumbai 400 013 Tel 91 22 2490 2283 2492 3183 Fax 91 22 2495 1024 E mail office emcoelectronics org 15 Wood Street 1st Floor Richmond Road Bangalore 560 025 Tel 91 80 2557 0215 Fax 91 80 2556 6606 E mail emcoblr emcoelectronics org Visit us at www emcoelectronics org Instruction Manual DOC NO MK 301ET 702 ISS 2 I INTRODUCTION EMCO s Voltage Regulating Relay Type EE 301ET combines both AVR and TPI in one unit t is used to regulate the secondary vg of power transformer using OLTC and display Tap No CONTENTS TITLE INTRODUCTION GENERAL DESCRIPTION SPECIFICATIONS FAMILIARIZATION WITH INDICATIONS CONTROLS OPERATION INSTRUCTIONS TYPICAL INSPECTION PROCEDURE FUNCTIONAL DESCRIPTION OF VARIOUS MODULES FAULTFINDING PROCEDURE LIST OF DRAWING amp RECOMMENDED SPARES amp OPTIONS WARRANTY FAULT REPORTING FORM The required dead band settings are set by L amp
8. Maximum Tap and check whether TPI reads correctly Vil FUNCTIONAL DESCRIPTION OF VARIOUS MODULES AVR SMPS This SMPS is mounted on the base plate This takes 95 260V AC DC and steps it down to 12V DC PT Transformer This is mounted on the base plate and steps down PT input from 110V A C to 1 1V A C which is used for sensing PT Vg AVR Main PCB This module generates 12V DC 5V DC required for circuit operation The PT input is stepped down in the ratio 110 1 1 This stepped down voltage is rectified filtered and amplified by IC1 This voltage is used for comparison with reference voltage settings on Display PCB L R UV signals are received from Display PCB On receiving any of L or R signals IC7 generates Time Delay generates Time Delay energizing appropriate relay The NO contacts are brought out on the Rear Panel Terminal Block In case of UV condition the relays are blocked and no control pulses are available The IC10 is used to convert the analog voltage to digital voltage and display the same on 7 segment display on Display PCB AVR Display PCB The L R and UV settings are compared with the DC output by IC1 and the L R and UV LEDS indicate these conditions Selector switch selects the L and R settings and PT I P to be displayed on the 7 segment display LR RR LEDs indicate the relay operation condition Time Delay settings allows the required time delay to be set TPI SMPS This SMPS is mounted on the base plate T
9. ck the Aux fuse 300mA amp PT fuse 100mA If necessary replace them Do not interchange the fuses Tighten them properly Confirm that the display PCB mates properly with the Main PCB Connect Aux supply amp PT supply amp Switch ON the unit If the unit does not get switched ON then check Power ON switch Measure DC voltages on TP1 TP2 amp TP3 w r t TP4 They should be 12V 12V amp 5V respectively If the voltages are not correct remove Display PCB and check once again If the voltages are correct then there is problem with the Display PCB Replace the Display PCB If the voltages are still not OK check the mains transformer Replace the mains transformer if faulty or else replace Main PCB Confirm all DC voltages are OK Keep the selector switch to R set position and vary R set control to read 90V to 120V on display Set R set control to 108V Set selector switch to L set position and vary L set control to read95V to 125V ondisplay Set L set control to 112V If any of the settings are not obtainable it means Display PCB is faulty Check potentiometers for their open short conditions amp replace if necessary If not IC10 on Main PCB or selector switch on Display PCB may be faulty Replace the faulty component Put selector switch to PT I P position Vary the PT IP and read the display If display does not vary then measure AC Voltage at TP5 w r t GND TP4 It should vary from 0
10. eration of the Raise Control Relay is automatically inhibited when the voltage falls below the specified under voltage limit or if PT fails One pair of normally open relay contacts are provided to effect the tap change during Raise and Lower operations SPECIFICATIONS Auxiliary Supply AVR 95 260V AC DC 10VA TPI 95 260V AC DC 5VA PT Supply 110V AC 50Hz 1 5 VA and readable on display Lower Voltage Setting Adjustable between 95V to 125V and readable on display Raise Voltage Setting Adjustable between 90V to 120V and readable on display Time Delay Setting Time Delay Resetting Under voltage Blocking Control Relays Control Operation Maximum Tap Tap Chain Resistance Operating Temperature Overall Size Panel Cutout Weight Options Fixed Voltage independent Time Delay continuously adjustable from 10 to 120 seconds Instantaneous resetting with voltage deviation occurring in opposite direction Internal blocking at 80V Restoration at 85V One pair of normally open potential free contacts of rating 5A at 240V AC or 24V DC resistive load for each Lovver and Raise control relays Single Pulse operation with 2 seconds approx on time 35 1 1KE or User defined 0 45 C 92 x 192 x 220 mm H x W x D 90 x 184mm H x W 1 5kg Approx 1 User defined Raise Lower settings amp Undervoltage Blocking 2 Apair of NO contacts for UV condtion OR Auxiliary Supply Fail Relay Alarm F
11. his takes 95 260V AC DC and steps it down to 12V DC TPI Main PCB This Module generates the necessary Voltages and and senses the Max Tap and Current Tap positions which are then fed to Microcontroller for displaying TPI Display PCB This Module displays the Tap Position and holds TPI Adi Pot Adjust this pot if the Tap No displayed does not matches with the actual Tap No FUSE REPLACEMENT 1 After switching power on the display indication must come If it does not come check whether AUX fuse on the rear panel is properly tightened If the instrument still does not work unscrew the fuse amp check if it is open Replace it by another fuse of 300mA 20mm Once again ensure that the fuse is not loose The instrument should turn on now If the fuse keeps on blowing repeatedly or the instrument does not work inspite of good fuse proceed to identify the fault as given in fault finding procedure VIII Connect the PT supply If the Instrument is turning on but you are continuously getting R and UV indication check whether PT fuse is loose If the condition persists even after tightening PT fuse remove the same and replace by another 100mA 20mm fuse If UV and R indication still persist proceed to identify the fault as given in fault finding procedure VIII Vill FAULT FINDING PROCEDURE Step 1 Step 2 Step 3 Step 4 Step 5 Check for any physical damage by drawing out the cage Che
12. ly after the Time Delay as set by this control has elapsed and the PT Voltage continues to remain outside the set Lower or Raise limits but does not fall below the UV limit The time delay can be set from 10 secs to 120 secs Selects the voltage setting to be monitored on the display It also selects the PT voltage to be displayed In case Tap No display is not correct it is used to adjust the Tap No display Check the PT fuse Connect the PT amp AVR Auxiliary supply to the appropriate terminal 3 4 and 1 2 respectively of the rear panel terminal block In case separate Auxiliary supply is not available then the same PT supply can be connected to both the PT and Auxiliary terminals Leave the unit ON for 15 minutes before making any settings Connect TPI Auxiliary Supply to terminal 8 9 on the rear panel terminal block DEAD BAND SETTINGS Set the Raise and Lower settings by selecting the switch and adjusting the R Set and L Set potentiometers to the required settings UNDER VOLTAGE BLOCKING This is factory set at 80V Note that between Blocking and the Release Restoration a hysteresis of 5V has been provided ie if the PT voltage falls below 80V UV condition will occur and block the control action i e RAISE would be inhibited However if the voltage rises again the RAISE control continues to remain inhibited till PT voltage reaches 85V Blocking 80V and Restoration 85V are factory set values unless
13. rol pulse will remain ON for 2 sec after which the Time Delay of 30 sec will restart and the control pulse will come again for 2 secs and the cycle is repeated The NO contacts on pins 6 7 on rear panel connector will close when LR is ON and open when LR is OFF B RAISE VOLTS OPERATION CHECK 1 Reduce PTSupply below 108V at least 107 5V but ensure that it is above UV limit 80V R LED should turn on immediately The RR control pulse will come on after 30 sec from the instant of turning on of R LED The control pulse will remain on for 2 sec after which the T D is initiated again After another 30 sec the control pulse will come again for 2 sec and the cycle is repeated The NO contacts on pins 5 6 on rear panel connector will close when RR is ON and open when RR is OFF C UNDER VOLTAGE PT FAIL OPERATION CHECK 1 Reduce the PT supply below 80 V UV LED will turn ON immediately under this condition R LED wiil also be on but Raise control is inhibited Raise the PT supply above 85V UV LED should turn off immediately R LED indication however shall remain on if the PT voltage is still below the Raise setting The raise control pulse will come on after the set Time Delay 4 Disconnect external PT supply The UV amp RLEDs will turn on immediately After restoration of PT supply the UV LED will turn OFF D TPI Operation Check Change the Tap position from 1 to
14. t Dist Thane 401208 FAULT REPORTING FORM FOR AVR EE301 E Please fill this form when sending faulty AVR Module for repairs This will help us to serve you better AVR Serial No Working Since Supplied By Nature of problem Settings on AVR LSET RSET TD Check Auxillary amp PT Fuses before proceeding Display Rdg Please observe the following on the faulty AVR amp tick the appropriate box Display varies with PT I P R LED glowswhen display rdg lt R SET RR LED pulses afterTD LED glows when display rdg gt L SET UV glows for UV condition ALLLEDs are off in Deadband condition RR contacts close open for step 3 1 2 3 4 5 LR LED pulsesafterTD 6 1 8 9 LR contacts close amp open for step 5 10 Any of the LR RR contacts permanently closed 11 All DC voltagesare OK 12 T1 LED on Main PCB toggles ON OFF for continuous LR conditions 000000000000 000000000000 Note Drawout cage and check 13 Any other information NAME OF TEST ENGINEER
15. t must be returned to EMCO ELECTRONICS securely packed on Freight paid basis and accompanied by a certificate stating that the equipment is being returned for warranty repairs and also note giving details of the purchase Purchaser s Name and address invoice No and Date of purchase and details of the equipment failure fault conditions other useful information to faciliate early repair rectification of the equipment Return of the equipment duly repaired can be arranged on payment of the packing and forwarding charges together with any other taxes duties other miscellaneous expenses incurred Altematively the purchaser may arrange to collect the equipment from EMCO ELECTRONICS In case the repairs are not covered under warranty the charges for the same must also be paid before collection of the equipment Our engineers services are available at site for instruments during warranty or out of warranty period on chargeable basis detaiis of which are available on request In the interest of development and improvement EMCO ELECTRONICS reserve the right to amend without notice details contained in this publication No legal liabilities will be accepted by EMCO ELECTRONICS for any errors omissions or amendments CUT HERE amp POST To EMCO ELECTRONICS Unit No 13 Kedamath Tungareshvvar Industrial Complex No 1 Village Sativali Vasai Eas
16. t operating then check 12V supply to relays If relays are operating but NO contacts are not closing means relay contacts are faulty Ensure that Relay contacts are not connected tothe Tap Changer when testing Replace Main PCB if faulty In above description it is assumed that display amp LEDs are OK Table No 1 On Main PCB Test Points Expected Voltage betTP1 amp TP4 12V 0 5 V bet TP2 amp TP4 12V 05 V betTP3 amp Tp4 5V 0 25 V betTP5 amp TP4 When PT I P is varied from 0 to 150V bet TP6 amp TP4 7 5V DC 0 2V For PT input 110V AC should vary with PT input Note Adjust P2 for setting 7 5V at TP6 Adjust P3 for setting 110V display for 7 5V DC at TP6 Adjust P1 for setting 80V UV setting NATURE OF FAULT Unit not getting ON UV indication ON Display reads 000 in all position of selector switch Or No variation in display reading by varying R L set controls Lor R or UV indications not coming after varying P T input beyond dead band settings Or L or R indication remains permanently ON LR or RR not coming after varying PT I P voltage after the set time delay Or Time delay LED on Main PCB remains ON permanently Time delay is not as per set value LR amp RR commands coming but OLTC not operating LR or RR commands remain ON permanently PROBABLE CAUSES Check fuses Power On Switch Connections to Rear Panel Terminal Block OK Check Mains
17. the customer has specified other values TIME DELAY This is a variable control with variation from 10 sec to 120 sec The actual setting can be made as required The corrective action will take place only after the set Time Delay interval is elapsed provided the voltage deviation persists even after the set Time Delay and that the relay is not operating in UV mode CONTROL RELAYS Connect the respective Lower and Raise NO contacts available on the Rear Panel Terminal Block pins 7 6 5 to operate the respective contactors Please note that for the operational safety RAISE and LOWER relays are interlocked and hence OLTC will never receive two opposite commands simultaneously VI TYPICAL INSPECTION PROCEDURE 1 Connect 95 260V AC DC AVR and TPI Aux supply to pins 1 2 and 8 9 respectively of the rear panel connector Connect110V AC supply to the PT I P pins 3 4 through a variac Turn on the instrument by putting povver svvitch to ON position Makethe following settings through the selector switch LOVVER VOTS Setting 112V RAISE VOLTS Setting 108V Set TIME DELAY Setting to 30 Sec Connect Resistor Chain to pins10 11 amp 12 Max Com amp Min on the rear panel connector A LOWER VOLTS OPERATION CHECK 1 Increase PT supply above 112V at least 112 5V L Lamp should immediately turn on The LR Control pulse will come on only after 30 sec fromthe instant of tuming on of L LED The cont
18. transformer and DC voltages as per Table 1 If faulty replace Main PCB Check PT supply PT Fuse and Sense transformer If all are OK check 7 5V DC TP6 If faulty replace Main PCB Ato D convertor is faulty Replace Main PCB IC1 on Display PCB is faulty Replace Display PCB Digital circuitary on Main PCB faulty Replace Main PCB Adjust Pot P4 on Main PCB for 10 secs or 30 secs and check other Time delays Check contacts on Rear Panel Terminal Block If OK check control panel wiring If contacts are not OK replace Main PCB IC9 on Main PCB faulty Replace Main PCB IX LIST OF DRAWINGS Block Diagram Front Panel View Rear Panel View Cutout Dimensions AVR connections be gt DENOTE PINS ON RECOMMENDED SPARES MAIN PCB Main PCB Display PCB FIGURES MARKED IN TERMINAL BLOCK Mains Transformer Sense Transformer LR RR COMMANDS Option For Undervoltage Contacts TO DISPLAY TIME CKT FOR i DELAY CKT A D CONVERTER CONTROL 1 1 A pair of NO contacts are provided on Terminal Block pins 8 amp 9 on the Rear Panel The contacts close when UV condition occurs or PT fails amp opens when UV condition is restored The contact capacity is similar to contacts for Lower amp Raise relays OR TIME DELAY N
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