The MRM4 is a protection relay which uses the latest Dual-Core-Processor Technology to provide precise and reliable protective tunctions 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: 2023-09.
Feature highlights
Marine Approvals
Motorstart
Application
- Low and high voltage asynchronous motors. Protection based on current and voltage measurement
Motor Protection Functions
- Thermal overload protection 49M
- Locked rotor protection 51LRS
- JAM or Stall protection 51LR
- Underload protection 37
- Motor start 48
- Starts per Hour 66
- Negative phase sequence (current unbalance) 46
- Overcurrent/short circuit prot. 50P/51P
- Earth overcurrent and short circuit protection 50N/51N
- Reclosing lockout 86
- RTD supervision via external temperature box 26 (type MRM4-2B)
Additional Highlights
- 20 mA output (Type MRM4-2B) Long starting time for reduced voltage starts
- Emergency Start
- Incomplete sequence
- Anti-backspin time delay
- Permitted number of cold starts
- Supervision of starts per hour
- Mechanical load shedding
- Zero speed detection (stall) via digital input
- Motor stop inputs
- External alarm and trip inputs
Motor Start Recorder
- Max. RMS values of phase currents
- Negative phase sequence currents
- Start duration, Successful starts
- Used thermal capacity
- Temperature profile (optional)
History Counter
- Motor starts, numbers of alarms and trips of all important protection functions like I, IG, thermal supervision, JAM, undercurrent and negative phase sequence
- Breaker wear values
- Motor run time
- Motor operation counter, History
Logic
- Up to 80 logic equations for protection, control and monitoring
Control
- 1 breaker, Breaker wear
Time Synchronisation
- SNTP, IRIG-BOOX, Modbus, DNP 3.0, IEC 60870-5-103/-104
System Supervision Functions
- CBF, circuit breaker failure 50BF
- TCS, trip circuit supervision via digital inputs 74TC
- CTS, current transtormer supervision 60
Recorders
- Disturbance recorder: 120s non volatile
- Fault recorder: 20 faults non volatile
- Event recorder: 300 events non volatile
- Trend recorder: 4000 non volatile entries
PC Tools
- Free Setting and analyzing software Smart view
- Including page editor to design own Control pages
- SCADApter to re-assign datapoints for Retrofit projects: Modbus, Profibus, IEC 60870-5-103/ - 104
Commissioning Support
- Customizable Display (Single-Line)
- Customizable Inserts
- Copy and compare parameter sets
- Configuration files are convertible
- Forcing and disarming of output relays
- Integrated fault simulator
- Graphical display of tripping characteristics
- 8 languages selectable within the relay
Communication Options
- IEC 61850
- Profibus DP
- Modbus RTU and/or Modbus TCP
- IEC 60870-5-103
- IEC 60870-5-104
- DNP 3.0 (RTU, TCP, UDP)
- SCADApter
- Redundant Ethernet: Two Ethernet channels available on the device [Electrical Ethernet [RJ45] or Optical Ethernet [FO]
- fiber optic cable
- Switch-Mode [Redundancy with RSTP]
- PRP - Parallel Redundancy Protocol
- HSR - High-Availability Seamless Redundancy Protocol
Statistic Recorder
- Number of successful starts
- Average |2T values
- Average max. start current
Cyber Security
- Menu for the activation of security settings (e. g. hardening of interfaces)
- Security Logger
- Centralized Security Logs (Syslog)
- Encrypted Connection Smart view Device
- Device specific certificates (No man in the middle attacks)
Technical Specs
Connections (Example)
certified regarding CSA-C22.2 No. 14
(Industrial Controls)
Type tested and certified by KEMA Laboratories in accordance with the complete type test requirements of IEC 60255‑1:2009.
certified by EAC
(Eurasian Conformity)
certified regarding UL508
(Industrial Controls)
CE certified
VDE FNN compliant
Download
PDF files
All essential
HighPROTEC MRM4
information such as Broschures or User Manuals etc. are available in our download section.
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