MPR500 Motor Protection Relay User`s Guide
Contents
1. 10s 6 1 2 3 4 5 Wp b With prior 50 thermal capacity 3 2 7 Phase Loss Phase loss fault is detected when average motor current is larger than 0 28 x Ip but any phase current is less than 0 1 x Ip Tripping takes place in less than 120ms when phase loss is detected 3 2 8 Phase Sequence Phase sequence fault is detected when the phase sequence in any 2 or all the phases are reversed Tripping takes place in less than 120ms when phase sequence fault is detected 3 2 9 Prolonged Starting and Stalled Rotor For prolonged starting and stalled rotor there is one Is gt gt setting and separate time delay setting for each protection Is gt gt shall be set below the motor starting stalled current These protections are useful when thermal overload protection is not fast enough to protect the motor during stalling Time delay for prolonged starting tstart gt gt shall be set longer than specified motor starting time Tripping takes place when any phase current is larger than Is gt for longer than tstart during motor starting Time delay for stalled rotor tsta gt gt is activated upon completing the motor starting Tripping occurs when any phase current is larger than ls gt gt for longer than tstal gt gt during motor running Both protections can be disabled by setting Is gt gt to off To disable only one of the protection set t2. Table 2 Tripping display 5 Typical Application Diagram L3 L2 L1 F4 F1 F2 F3 K1 Block R1 Reset Trip 2 10A MPR 500 Motor with full load current of 2A to 10A Figure 5 Example of application K1 4 2 Tripping Reset During tripping condition press RESET MODE to reset the relay will reset if condition permits If relay is set to auto reset the relay will reset automatically if the tripping condition is cleared with a 5 hysteresis 4 3 Tripping Test Press TEST to simulate a tripping condition tESt will blink R1 off and R2 on if set to On any tripping Press RESET MODE to reset 4 4 Binary Input Tripping When Binary input is set to 2 Instant tripping binary input will generate a tripping condition triP will blink R1 off and R2 on if set to On any tripping Press RESET MODE to reset If relay is set to auto reset the relay will reset after the input is normal for 1s 4 5 Tripping History Display During Current Thermal display press RESET MODE to jump to Tripping History Display Display shows the previous tripping status with a dot blinking at Function LED To clear tripping history press UP and DOWN simultaneously L3 L2 L1 F4 F1 F2 F3 MPR 500 Block R1 Reset Trip E Motor with higher full load current using external CT 7 Tech
3. A l s gt gt Prolonged starting stalled rotor t b tstart gt gt Prolonged starting time delay c tstal gt gt Stalled rotor time delay d lg Base full load current f E External CT ratio F1 Auto Manual Reset f CS Figure 3 Display mode when pressing Reset Mode F2 Binary input F3 Relay 2 3 2 Programming Setting Step 1 Press RESET MODE until the Function LED shows the required setting Step 2 Press UP and DOWN simultaneously to enter programming mode The Function LED blinks to indicate the relay is in programming mode Step 3 Press UP or DOWN to change the value Step 4 To save the new value press UP and DOWN simultaneously again Programming mode exits function LED stop blinking To exit programming mode without saving press RESET MODE once Setting Function Setting Range Description 1 tex Thermal overload 1 40s In steps of 0 1s Time constant for thermal overload time constant for 1 10s in steps of 1s for 10 40s 2 l gt gt Short circuit off 2 12 x Ip In steps Short circuit setting in multiples of Ip of 1 x Ip 3 t gt gt Short circuit time 0 25s In steps of 0 1s Time delay for short circuit delay for 0 10s in steps of 1s for 10 25s 4 lt lt Undercurrent off 20 90 of Ip In Undercurrent setting in of IB steps of 1 5 t
4. Motor starting On Motor running b Trip LED Trip LED is normally off During tripping pickup where tripping delay is counting down Trip LED blinks Trip LED on during tripping Off Normal Blink Pickup On Tripping c Thermal LED Thermal LED off when motor current is less than 105 of Ip If motor current is more than 105 of Ip Thermal LED blinks to give thermal overload warning Thermal LED on during thermal overload tripping Off Normal Blink Thermal overload warning On Thermal overload tripping 3 Settings and Protection Features 3 1 Setting Display When the relay is not under tripping condition pressing RESET MODE will scroll through various settings Function LED showing number or alphabet to indicate which setting is being view as shown in Figure 3 Table 1 gives description of each setting Tip To quickly jump back to current thermal display during setting display press and hold RESET MODE for 1 5 second Current Thermal Display Tripping History 4 1 tex Thermal overload time constant j 2 gt gt Short circuit j 3 t gt gt Short circuit time delay 4 lt lt Undercurrent 5t lt lt Undercurrent time delay 614 Unbalance e 7 ta Unbalance time delay 8 l gt gt Earth fault ej leo 9 to gt gt Earth fault delay lt
5. is allowed to reach a 6 x Ig Cooling constant time is defined as 4 times of heating constant time and is applicable when motor current is less than 0 2 x Ip Refer to the thermal tripping curve on Figure 4 3 2 4 Short Circuit This protection is to trip the relay quickly when high current is detected due to short circuit gt gt is normally set higher than motor starting current to avoid false tripping during motor starting and t gt gt is set to very short duration Tripping takes place when any phase of motor current is larger than I gt gt for longer than t gt gt It can be disabled by setting t gt gt to off 3 2 5 Undercurrent Undercurrent protection is activated when average motor current is larger than 0 1 x Ip Tripping takes place when average motor current is smaller than I lt lt for longer than t lt lt It can be disabled by setting t lt lt to off 3 2 6 Unbalance Unbalance is calculated as max Imin X 100 min where Imax is the maximum phase current among the 3 phases Imin is the minimum phase current among the 3 phases Tripping takes place when unbalance value is more than unbalance setting for longer than unbalance delay It can be disabled by setting unbalance delay to off Figure 4 Thermal tripping curve 10s
6. MPR500 Motor Protection Relay User s Guide Brief Overview Mikro h Motor Protection Relay EEO EE Figure 1 Front panel overview a Run LED Symbols b Trip Pickup LED tex Thermal overload time constant I gt gt Short circuit High set Overcurrent e Thermal LED t gt gt Short circuit High set Overcurrent time delay d Down key I lt Undercurrent e Up key t lt Undercurrent time delay A Unbalance ty Unbalance time delay g Test key l gt Earth fault f Reset Mode key h Data LED to gt Earth fault time delay Is gt gt Prolonged starting stall rotor i Function LED tstart Prolonged starting time delay tsta Stall rotor time delay l Base full load current CT External current transformer ratio 1 General Description MPR500 is a motor protection relay that combines thermal overload short circuit undercurrent unbalance phase loss phase sequence lock stall rotor and earth fault protections MPR500 incorporates a 4 digit LED indicator which allows direct numerical readout of set values actual measured value and system indication MPR500 has 2 relay outputs R1 and R2 R1 is On under normal operating condition to allow motor running and off during tripping R2 is programmable to give signal in various conditions A programmable binary input is provided to perform various operations upon binary input tri
7. ggering 2 Display 2 1 Current and Thermal Capacity Display During power up when the relay is not under tripping condition the display shows current in ampere or thermal capacity The Function LED indicates which parameter is being displayed The Data LED showing value Press UP or DOWN to scroll through the parameters l1 lL1 Ia ltz tig IL2 I12 ltz lir lL3 fa M3 ty Io le ltz li Thermal 2 lt Figure 2 Current and thermal capacity display For current more than 1000A a dot is shown behind least significant digit Eg 1 25 1 25kA IL1 Phase 1 current IL2 Phase 2 current IL3 Phase 3 current lo Zero sequence Earth fault current Thermal Thermal capacity Thermal overload trip ping at 100 During Thermal capacity display thermal capacity can be cleared to 0 by pressing UP and DOWN simultane ously for longer than 1 5 seconds Warning Clearing thermal capacity effectively reset to cold start condition user is not encouraged to clear thermal capacity unless it is sure that motor is cool enough to run start within its thermal limit 2 2 Auto Scroll When auto scroll is enabled the display scrolls between currents and thermal reading every 10 seconds To toggle auto scroll mode press UP and DOWN simultaneously 2 3 LED Display a Run LED Run LED shows the motor status Refer to 3 2 1 Motor Starting Off Motor stopping Blink
8. he respective time delay for the protection to be disabled to much longer than specified 3 2 10 Earth Fault Earth fault protection is based on zero sequence current calculation Tripping takes place when the current is larger than earth fault setting in of Ip for longer than to gt It can be disabled by setting to gt gt to off 3 2 11 Base Current Base current is the motor full load current The range of setting is model dependent The formula is Motor full load current lB X 100 Nominal relay current IN For example to use the relay that has nominal current IN of 5A with motor that has full load current of 4 5A 4 5 lB 5 A1005 90 When external CT is used the formula is Motor full load current x 1 B X 100 Nominal relay current IN CT ratio For example to use the relay that has nominal current IN of 5A with motor that has full load current of 138A using external CT of 150 5 138 5 IR o B 5 X 750 X 100 92 3 2 12 External CT Ratio If external CT is connected the CT ratio shall be set accordingly for the display to show correct current For example when using 150 5 CT set the value to External CT ratio 30 3 2 13 Manual or Auto Reset The relay can be set to manual or auto reset when the relay trips Resetting of relay is allowed when the tripping condition cleared Manual reset is performed by pressing the RESET MODE or using binary input if it is conf
9. igured as 1 Reset trip Thermal overload is always auto reset 3 2 14 Binary Input The binary input is a dry contact input that can be configured to perform various functions 0 Block relay 1 The input when triggered will force relay 1 off 1 Reset tripping The input is used to manually reset a tripping 2 Instant tripping The input will generate a tripping condition Refer to 4 4 Binary Input Tripping 3 2 15 Relay 2 The relay 2 output can be configured to turn on in these conditions 0 On any tripping Relay 2 on during any tripping 1 On thermal tripping Relay 2 on during thermal tripping only 2 On thermal warning Relay 2 on when motor current is more than 1 05 x IB 4 Tripping 4 1 Tripping Display During tripping Trip LED on Thermal LED also on during thermal overload tripping Function LED and Data LED blinks showing tripping current or source as shown below Trip LED Thermal Function Data LED Description LED LED On On t joL Thermal Overload tripping On Off 2 tripping current Short circuit tripping On Off 4 tripping current Undercurrent tripping On Off 6 Ub Unbalance tripping On Off 6 IPS Phase sequence error tripping On Off 6 PL Phase loss tripping On Off 8 tripping current Earth fault tripping On Off A tripping current Prolonged starting Stalled rotor tripping On Off t ESt Trip Test On Off t riP Binary input tripping
10. ing 5A 250V AC cos 1 Contact material Silver alloy Operating time 15ms max Expected electrical life 100 000 operations at rated current Expected mechanical life 5x 106 operations INDICATORS Run Green LED indicator Trip Pickup 7 segment display and red LED indicators Thermal Yellow LED 6 Case Dimension 96 mm 90mm gt A E Front Panel Cutout E o O D O y hmSSC CS Figure 6
11. inical Data SETTING RANGES Thermal Overload time constant tex 1 40s In steps of 0 1s for 1 10s in steps of 1s for 10 40s Short circuit gt gt off 2 12 x Ip In steps of 1 x Ip Short circuit time delay t gt gt OQ 25s In steps of 0 1s for 1 10s in steps of 1s for 10 25s Undercurrent I lt lt off 20 90 of Ip In steps of 1 x Ip Undercurrent time delay t lt lt O 60s In steps of 0 1s for 1 10s in steps of 1s for 10 60s Unbalance UU off 10 50 In steps of 1 Unbalance time delay ty O 25s In steps of 0 1s for 1 10s in steps of 1s for 10 25s Earth fault Io off 10 60 of Ip In steps of 1 Earth fault time delay to O 25s In steps of 0 1s for 1 10s in steps of 1s for 10 25s Phass loss lt 120ms Phase sequence lt 120ms Prolonged starting stalled rotor Is off 2 12 x Ip In steps of 1 x Ip Prolonged starting time delay tstart 0 60s In steps of 0 1s for 1 10s in steps of 1s for 10 60s Stalled rotor time delay tstall O 60s In steps of 0 1s for 1 10s in steps of 1s for 10 60s CT RATINGS Rated current SA Rated frequency 50 or 60Hz Burden lt 0 3VA at rated current Thermal withstand 4x rated continuous AUXILIARY SUPPLY Model MPR 500A 240A 198 265 V AC Model MPR 500A 240AD 85 265V AC 110 370 VDC Model MPR 500A 24D 24 72VDC Supply frequency 50 or 60 Hz Maximum power consumption 3 VA typical CONTACTS Contact arrangement Change over Contact rat
12. le 1 Description of settings 3 2 1 Motor Status Upon power on the relay if there is no tripping Relay 1 turns on If motor current is more than 1 1 x Ip motor is considered starting If motor current is less than 1 05 x IB motor is running Motor is stopping when motor current drops below 0 1 x IB RUN LED shows the motor status If motor starts for longer than 60s Run LED stop blinking and off Relay 1 also off This condition persists until motor current drops below 0 1 x Ip 3 2 2 Thermal Overload The protection is based on mathematical model of motor thermal image The thermal capacity is calculated continuously when motor is starting overloading or even after tripping Tripping takes place when the thermal capacity of the motor reaches 100 This could happen when the motor current is higher than 1 05 x Ig After tripping a new start is not allowed until the motor cools down to less than 40 of thermal capacity Thermal capacity can be cleared to 0 by pressing UP and DOWN simultaneously for longer than 1 5 seconds during thermal capacity display Warning Clearing thermal capacity effectively reset to cold start condition user is not encouraged to clear thermal capacity unless it is sure that motor is cool enough to run start within its thermal limit 3 2 3 tex Thermal overload Time Constant tex sets the themal overload time constant heating constant which is the maximum period of time when motor current
13. lt lt Undercurrent time 0 60s In steps of 0 1s Time delay for undercurrent delay for 0 10s in steps of 1s in 10 60s 6 A Unbalance off 10 50 In steps Phase unbalance setting in of 1 7 t Unbalance time 0 25s In steps of 0 1s Time delay for phase unbalance delay for 0 10s in steps of 1s for 10 25s 8 Io gt Earth fault off 10 60 of Ip In Earth fault setting in of Ip steps of 1 9 to gt Earth fault time 0 25s In steps of 0 1s Time delay for earth fault delay for 0 10s in steps of 1s for 10 25s A ls gt gt Prolonged starting off 2 12 x Ig In steps Prolonged starting stalled rotor setting in stalled rotor of 0 1 x Ip multiples of Ip b tstar gt gt Prolonged 0 60s In steps of 0 1s Time delay for prolonged starting starting time for 0 10s in steps of delay 1s for 10 60s c tstai gt gt Stalled rotor 0 60s In steps of 0 1s Time delay for stalled rotor time delay for 0 10s in steps of 1s for 10 60s d lg Base full load current 40 200 of Iy Base full load current of motor in of relay nominal current Ij is model dependent E External CT ratio 1 200 1 External CT ratio 1 direct F1 Auto Manual Reset 0 Manual reset Manual or auto reset of tripping 1 Auto reset Thermal overload is always auto reset F2 Binary input 0 Block relay 1 Setting for binary input 1 Reset tripping 2 Instant tripping F3 Relay 2 0 On any tripping Relay 2 setting 1 On thermal tripping 2 On thermal warning Tab
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