MRM4 Motor protection

Product detail

Product code:
MRM4
Price
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Product Information

Download Area

Available options

Documentation (Brochures & Manuals)

Operating Software Smart view: Documentation & Setup

Application

The MRM4 is a protection relay which uses the latest Dual-Core-Processor Technology to provide precise and reliable protective functions and is very easy to operate.

The MRM4 provides all necessary functions to protect low and medium voltage motors at all power levels. The protection functions are based on current measurement.

They supervise the motor start sequence (motor start), they detect a stall or locked rotor condition and they monitor the thermal condition of the motor.

Overcurrent and earth overcurrent protection as well as unbalanced load protection are included in the protection package. The status and operation of the motor will also be monitored by means of the statistic and trend recorder. All important events and measuring values will be logged by means of the start, event, failure and disturbance recorder.

The protection functions of the MRM4 have been adapted to comply with the requirements of the VDE-AR-N-4110:2018.

Functional Overview

MRM4 Functional Overview

Approvals

UL File Nr.: E217753

certified regarding UL508 (Industrial Controls)

CSA File Nr.: 251990

certified regarding CSA-C22.2 No. 14 (Industrial Controls)

EAC

certified by EAC (Eurasian Conformity)

KESCO

동일성 선언서 (Declaration of Identity)

  • Complies with IEEE 1547‑2003

  • Amended by IEEE 1547a‑2014

  • Complies with ANSI C37.90‑2005

Key Benefits of the HighPROTEC MRM4

  • Wide range power supply: 24 … 270 VDC / 48 … 230 VAC

  • CT measurement always with 1 A and 5 A

  • Plausibility verification intelligence

  • Optimized functional overview by hiding unused functions, parameter and assignments

  • On-board testing without removing the wiring

  • Menu Languages supported: English, German, Spanish, Portuguese, French, Russian, Polish, Romanian


Application

  • Start Cycle Supervision

  • Overload

  • Jam / Locked Rotor

  • Underload

  • Unbalanced Load

  • Number of Starts, Counters,…

  • Keeping motor load under the Thermal Damage Curve

Inputs and Outputs
Analog outputs 0 (1)
Binary inputs 4 (8)
Current transformer inputs 4
Output relays 3 (5)
Watchdog relay 1
Protection ANSI
Time overcurrent protection 50/51
Earth fault protection 50N/51N
Sensitive EF isolated/compensated 50Ns/51Ns (Option)
Resistance earthed / solidly earthed 50N/51N
Circuit breaker failure protection 50BF
Negative sequence protection 46
Motor protection: locked rotor 51
Motor protection: incomplete start 48
Motor protection: max. number of starts 66
Motor protection: undercurrent 37
Motor protection: thermal protection 49
Supervision ANSI
Current transformer supervision 60L
Trip circuit resp. control circuit supervision 74TC
Additional Features
Control and detection of switchgears
Control and supervision of a circuit breaker
Disturbance recorder
Event recorder
Fault recorder (none volatile)
Parameter sets 4
Programmable Logic
Communication
DNP3 RTU (Option)
DNP3 TCP (Option)
IEC 60870-5-103 (Option)
IEC 60870-5-104 (Option)
IEC 61850 (Option)
IRIG-B00X
Modbus (TCP) (Option)
Modbus RTU (Option)
Profibus DP (Option)
Mounting Type
Housing suitable for 19” rack mounting (Option)
Housing suitable for door mounting

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