In a multi motor parallel system, the misoperation of the motor protection controller MMPR-220 may be caused by current imbalance, signal interference, or abnormal grounding. To ensure the stable operation of the system, the following measures need to be taken to optimize configuration and maintenance:

 

Strictly follow the principle of one machine, one protection, ensure that each motor is independently connected to the controller, and avoid misjudgment caused by current superposition due to shared circuits. Each motor grounding wire should be independently connected to the same reference point of the grounding grid to prevent circulating current interference with the protection logic caused by ground potential difference. The secondary circuit of the motor controller MMPR-220 needs to be grounded at a single point to prevent abnormal leakage current caused by multiple grounding points.

 

Set the protection threshold based on the rated parameters of the motor, and ensure that the overload curve matches the motor characteristic curve to avoid triggering misoperations due to instantaneous current during startup. When multiple motors are connected in parallel, it is recommended to enable the "time-sharing start" mode of the motor controller MMPR-220, and stagger the start time through delay control to reduce the superposition of system surge currents. At the same time, set up independent fault isolation logic to ensure that only the corresponding controller action is triggered when a single motor fails, avoiding chain reactions.

 

Utilizing the built-in RS485 communication function of the motor controller MMPR-220 to achieve multi machine collaborative control requires the use of shielded twisted pair cables and independent wiring, kept away from power cables to reduce electromagnetic interference. Regularly check the signal strength of the communication module to ensure data transmission stability. For environments with high-frequency interference, filtering devices or isolation barriers can be added to prevent noise signals from accidentally triggering protection functions.

 

As a manufacturer of industrial products with a long history, YOYIK not only maintains a leading position in technology, but also pursues excellence in management philosophy. The company provides diversified products including turbine accessories, generator cover plastic seals, etc., serving a wide range of industrial fields. With fair prices and excellent quality, YOYIK has established a solid market position and good customer reputation worldwide.

 

Yoyik can offer many spare parts for power plants as below:

 

#DF-Motor protection controller MMPR-220-DF

Eddy Current Sensor PR6422/001-141

Two position,four-way solenoid valve YDK24DHS

SENSOR PROXIMITY TRANSDUCER TM301-A00-B00-C00-D00-E00-F00-G00

floating thermometer WSS-581W

Main Control Unit PEC800 PCD113

LVDT UKTD1-A01-B100-C01-D10-E01-F01

Auxiliary power PSMU-1-12V/10W

Eddy Current Sensor PR6422/001-111

Power Contactor CZO-100/20

induction heater bolt removal CHK03.606.21Z

Vibration Sensor PR6426/010-110

PROXIMITY SENSOR NBB20-L2-A2-V1

Displacement transmitter LTM-4-S4

LVDT Sensor mounting bracket Z25.4-5L

pick up coil sensor ZS-04

thermocouple WRNK2-833/NN/K

Pressure Switch 1246214-HK2027

Conductivity Sensor A-87.334.150

thermocouple C03A2-KY-2B/S1B

PCB FOR MMS M06-E04-00377

Pressure Differential Switch RC861CZ090ZYR24DC

Differential pressure transmitter 15RB-EE2-N4-C2A

Indicator steam inlet HP heater WSS-581

Sensor RTD Cold Air Generator L 185mm x Dia 8mm

Oxygen meter single heater HIGA2121

ESP Transformer XHDC, 250°

MANAGEMENT RELAY CSC-211-W4E-M12

thermocouple WRNK2-291K

THERMOCOUPLE WRN2-336

Zero speed sensor XD-TD-1

Intermediate relay UEG/A-2H/110VAC

TSI Sensor 330103-00-05-10-02-00

Pressure Switch 0184-457-03-3-003

Multifunction power meter PD194E-9F2

Speed sensor CS-1G-D-085-02-01

Eddy Current Sensor PR6426/000-041

LVDT sensor 10000TDGW-30-01

Motor protection controller MMPR-220

 

LVTD sensor 6000TD

LVDT Sensor CZTD-3A-100T

analog pressure switch 414871-QEK005

Speed sensor CS-1-G-100-03-01

Pressure Switch 12SHDN4F

PRINTED CIRCUIT BOARD IO PORT PCB JD10095

High Resistance Magnetoresistive Sensor CS-1 D-065-05-01

Integrator Analog Input Board 421400688

Electric Heater JH-023-680300 47

inductive linear sensor FRD.WJA2.601H

ELECTRICAL LINEAR VARIABLE DIFFERENTIAL TRANSFORMER ZDET200B

Current shunt resistror FL2-75mV, 400A

Vibration Sensor VRT-2T

Bolt electric heating rod ZJ-16.5-12

thermocouple WRNK2-2913MK

HP DIFFERENTIAL EXPANSION CON011/916-100

Bolt electric heating rod ZJ-20-54

Rotary air dryer gap monitoring sensor GJCF-15

Ignition transformer FC06-SA6

Temperature switch T768TS040XCNC4 20/95C

Gantry CWP pendant COBP-66BH

Hydrogen leakage sensor NA1000DII

non contact displacement sensor DET300A

Switch Disconnectors OT125FT3 

Sing LVDT HP CV TDZ-1-33

LVDT Transmitter LTM-6A

Eddy Current Sensor PR6426/000-021

LVDT Sensor ZD-2000TDA

Electric heater ZJ-18-1R

LVDT Sensor TD1000

circuit board ME8.530.004

speed sensor G-065-08-01

Metal detection sensor LJT-14

thermal resistance WZP2-6520NMF

Bimetallic thermometer WSS-411

LVDT Sensor 4000TDG-15-01

Hydrogen leakage detection sensor NA1000D-FH

Motor protection controller MMPR-220

 

MY-DFYL-2025-4-21