User Manual
Contents
1. 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 Description Trip LED Thermal Function Data LED LED LED On On t JoL Thermal Overload tripping tripping current Short circuit tripping tripping current Undercurrent tripping On Off PS Phase sequence error tripping Zee Se tripping current Earth fault tripping A tripping current Prolonged starting Stalled rotor gt Tie Test o input tripping Table 2 Tripping display 5 Typical Application Diagram L3 L2 L1 p 3 Phase Motor Figure 5 Example of application 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 and hold TEST for 3 5 seconds to simulate a tripping condition Trip LED blinks when TEST is pressed During Test Tripping tESt blinks R1 off and R2 on if set to On any tripping Press RESET MODE to reset Tripping Test is disabled when motor is starting running 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 res2. Front panel Approximate weight 1 40s In steps of 0 1s for 1 10s in steps of 1s for 10 40s off 2 12 x Ip In steps of 1 x IB 0 25s In steps of 0 1s for 1 10s in steps of 1s for 10 25s off 20 90 of Ig In steps of 1 0 60s In steps of 0 1s for 1 10s in steps of 1s for 10 60s off 10 50 In steps of 1 0 25s In steps of 0 1s for 1 10s in steps of 1s for 10 25s off 10 60 of Ip In steps of 1 0 25s In steps of 0 1s for 1 10s in steps of 1s for 10 25s lt 120ms lt 120ms off 2 12 x Ip In steps of 0 1 x IB 0 60s In steps of 0 1s for 1 10s in steps of 1s for 10 60s 0 60s In steps of 0 1s for 1 10s in steps of 1s for 10 60s 2 10A 50 or 60Hz lt 0 3VA at rated current Continuous 2 x maximum rated For 30s 6 x maximum rated For 1s 10 x maximum rated 12V Supplied internally 85 265 V AC 110 370 V DC 50 or 60 Hz 3 VA typical Change over 5A 250V AC cos 1 Silver alloy 15ms max 100 000 operations at rated current 5 x 108 operations Green indicator 7 segment display and red indicators Yellow indicator 5 C to 55 C 56 days at 93 RH and 40 C non condensing Panel mounting Standard DIN 96 mm x 96mm 0 75kg CASE DIMENSION 96 mm o D E Front O ee ee Panel Cutout Figure 6 90mm
3. 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 Delay time 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 Delay time for stalled rotor tSta gt gt is activated upon completing the motor starting Tripping occurs when any phase current is larger than Is gt gt for longer than tstalI 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 the respective delay time 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 Ig 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 IB Motor full load current X CT ratio For example to use the relay with motor that has full load current of 138A using external CT of 150 5 5 ise 138 x 46A gt 150 7 3 2 12 External CT Ratio The CT ratio shall be
4. Phase sequence PS 0 PS and PL off Phase sequence and phase loss option phase loss PL option 1 PSon 2 PLon 3 PL and PS on F5 Frequency 50 or 60Hz Nominal value of network frequency 3 2 1 Motor Status Run LED shows the 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 Run LED blinks If motor current is less than 1 05 x IB motor is running Run LED on Motor is stopping when motor current drops below 0 1 x Ip If motor starts abnormally for longer than 60s Run LED stops blinking and turns off Relay 1 also turns off This condition reset when motor current drops below 0 1 x lp 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 lp 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 until motor is cool enough to star
5. Thermal tripping curve time 2hour 1hour 30min 20min 10min s amia HA 3min iM 2min 1min t6x 40s r 40s 30s 30s 20s 20s 10s 10s 5s 5s 3S 2s 2s lt 1 05 1s 1s 1 2 6 Wp a With 0 thermal capacity cold start time 2hour 1hour 30min 20min 10min 5min 3min 2min 1min 40s 30s 20s 10s 5s 3S 2s 1s jp ae t6x 40s 30s 20s 10s 5s lt 1 05 pe 1s 6 1 2 3 4 5 Wp b With prior 50 thermal capacity 3 2 Phase Loss Phase loss fault is detected when average motor current is larger than 0 28 x Ig but any phase current is less than 0 1 x lp 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 Phase loss and phase sequence protection can be enabled and disabled separately Refer to 3 2 16 Phase sequence phase loss option 3 2 9 Prolonged Starting and Stalled Rotor For prolonged starting and stalled rotor there is one Is gt gt setting and separate delay time setting for each
6. 2 is programmable to give signal in various conditions A programmable binary input is provided to perform various operations upon binary input triggering 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 fu 113 Ih IL2 fue 113 l1 IL3 te 113 lir l Ie 113 Ih Thermal 12 113 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 lL4 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 simultaneousl
7. 90 of Ip In Undercurrent setting in of IB steps of 1 5 t lt lt Undercurrent delay 0 60s In steps of 0 1s Delay time for undercurrent time for 0 10s in steps of 1s in 10 60s 6 A Unbalance off 10 50 In steps Phase unbalance setting in of 1 T t Unbalance delay 0 25s In steps of 0 1s Delay time for phase unbalance time for 0 10s in steps of 1s for 10 25s 8 lop gt gt Earth fault off 10 60 of Ip In Earth fault setting in of Ip steps of 1 9 to gt gt Earth fault delay 0 25s In steps of 0 1s Delay time for earth fault time for 0 10s in steps of 1s for 10 25s A Is 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 IB b tstat gt gt Prolonged 0 60s In steps of 0 1s Delay time for prolonged starting starting delay for 0 10s in steps of time 1s for 10 60s C tstai gt gt Stalled rotor 0 60s In steps of 0 1s Delay time for stalled rotor delay time for 0 10s in steps of 1s for 10 60s d lg Base full load current 2 10A Base full load current of motor E External CT ratio 1 800 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 function 0 On any tripping Relay 2 function 1 On thermal tripping 2 On thermal warning F4
8. MPR500 Motor Protection Relay User s Guide v Brief Overview Mikro h Motor Protection Relay a a a a aMaMamM l b C F to gt gt g l gt gt H t Ci tstart d E tstall _ a lp e 5 CT H lo gt gt F SW f MPR 500 g Figure 1 Front panel overview a Run LED Sympos b Trip Pickup LED tgx Thermal overload time constant I gt gt Short circuit High set Overcurrent c Thermal LED t gt gt Short circuit High set Overcurrent delay time d Down key I lt Undercurrent e Up key t lt Undercurrent delay time A Unbalance t Unbalance delay time g Test key l gt Earth fault top gt Earth fault delay time f Reset Mode key h Data LED ls gt gt Prolonged starting stall rotor i Function LED tstart Prolonged starting delay time tsta Stall rotor delay time lb Base full load current CT External current transformer ratio SW Soft switch 1 General Description MPRS5OO 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 R
9. et 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 K1 Tion CONGA O Block R1 Reset Trip Single Phase Motor To use MPR500 for single phase protection lo gt gt Earth fault Phase sequence and phase loss protection should be set to off 6 Techinical Data SETTING RANGES Thermal Overload time constant tex Short circuit gt gt Short circuit delay time t gt gt Undercurrent lt lt Undercurrent delay time t lt lt Unbalance A Unbalance delay time ty Earth fault l0 gt gt Earth fault delay time to gt gt Phass loss Phase sequence Prolonged starting stalled rotor Is Prolonged starting delay time tstart Stalled rotor delay time tstall CT RATINGS Rated current Rated frequency Burden Thermal withstand BINARY INPUT Rated input voltage AUXILIARY SUPPLY Model MPR 500 240A Supply frequency Maximum power consumption CONTACTS Contact arrangement Contact rating Contact material Operating time Expected electrical life Expected mechanical life INDICATORS Run Trip Pickup Thermal ENVIRONMENTAL CONDITIONS Temperature Humidity MECHANICAL Mounting
10. nce 7 ta Unbalance delay time 8 l gt gt Earth fault 9 to gt gt Earth fault delay time A gs gt gt Prolonged starting stalled rotor c tstai gt gt Stalled rotor delay time d lg Base full load current E External CT ratio F1 Auto Manual Reset F2 Binary input F3 Relay 2 function F4 Phase Sequence Phase Loss option F5 Frequency Figure 3 Display mode when pressing Reset Mode 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 Table 1 Description of settings 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 lp In steps Short circuit setting in multiples of Ip of 1 x Ip 3 t gt gt Short circuit delay 0 25s In steps of 0 1s Delay time for short circuit time for 0 10s in steps of 1s for 10 25s 4 I lt lt Undercurrent off 20
11. set accordingly for the display to show primary 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 configured 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 Ip 3 2 16 Phase sequence phase loss option Phase sequence and phase loss detection can be on enabled and off disabled separately 0 Phase sequence and phase loss off 1 Phase sequence on 2 Phase loss on 3 Phase sequence and phase loss on 3 2 17 Frequency Nominal value of the network frequency Select either 50 or 60 Hz 4 Tripping
12. t run 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 is allowed to reach a 6 x Ip Cooling constant time is defined as 4 times of heating constant time and is applicable when motor current is less than 0 2 x IB 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 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 Imax 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
13. y 2 3 LED Display a Run LED Run LED shows the motor status Refer to 3 2 1 Motor Starting Off Motor stopping Blink 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 blinks when motor current is more than 105 of Ip Thermal LED on during thermal overload tripping and when thermal capacity is more than 40 after overload tripping in which R1 is off motor not allowed to start Off Normal Blink Thermal overload warning On Thermal overload tripping Thermal capacity high R1 off 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 b tstan gt gt Prolonged starting delay time Current Thermal Display Tripping History 1 tex Thermal overload time constant 2 gt gt Short circuit 3 t gt gt Short circuit delay time 4 lt lt Undercurrent 5t lt lt Undercurrent delay time 64 Unbala
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