MPU-32 Series Motor Protection Unit
MPU-32 Series Motor Protection
MPU-32 Series LV Motor Protection relay

MPU-32 Series Motor Protection Unit

The MPU-32 series Motor Protection Unit is used to provide current and temperature-based protection, metering, and data-logging for three-phase, low-voltage, medium-horsepower induction motors. This relay is ideal for retrofitting and upgrading obsolete or aging motor protection using existing CTs. The MPU-32 can be programmed using the front-panel operator interface, the TIA-232 port, or an optional communications network. See the PMA Family of Panel Mount Adapter Kits to replace common obsolete relays.

Contact us
Category:

MPU-32 Motor Protection Unit

  • Overload protection: Prevents motor overheating.
  • Ground fault protection: Detects and responds to ground faults.
  • Unbalanced current/Phase loss/Phase reverse protection: Monitors for imbalances in phase currents and phase sequence errors.
  • Overcurrent protection: Protects against excessive current.
  • Jam protection: Detects and responds to motor jamming.
  • Undercurrent protection: Detects and responds to low current conditions.
  • PTC overtemperature protection: Monitors and responds to motor temperature as measured by a PTC thermistor.
  • Starts per hour limitation: Prevents excessive motor starts.
  • Differential protection: Detects internal faults within the motor.
  • Dynamic thermal modeling: Accurately models motor thermal behavior for precise protection.
  • Communications capabilities: Supports RS-232 communications and optional network connectivity.
  • PC interface software: Enables easy configuration and monitoring.
  • User-friendly interface: Features a backlit LCD display and keypad for intuitive operation.

 

Specification of MPU-32 Motor Protection Unit

Protective Functions (IEEE Device Numbers) Overload (49, 51), Phase reverse (current) (46), Overcurrent (50, 51), Jam, Ground fault (50G/N, 51G/N),
PTC overtemperature (49), RTD temperature (38, 49), Unbalance (current) (46), Starts per hour (66),
Differential (87), Phase loss (current) (46), Undercurrent (37)
Input Voltage  65-265 V ac, 25 VA; 80-275 V dc, 25 W
Power-Up Time 800 ms at 120 V ac
Ride-Through Time 100 ms minimum
24-Vdc Source 100 mA maximum
AC Measurements True RMS and DFT, Peak, 16 samples/cycle, and positive and negative sequence of fundamental
Frequency 50, 60 Hz or ASD
Output Contacts Three Form C programmables
Communications TIA-232 (standard); TIA-485, DeviceNet™, Ethernet (optional)
Analog Output 4-20 mA, programmable
Conformally Coated Standard feature
Control Unit Mounting Panel (standard), Surface (with MPU-32-SMK converter kit)
Current Input Module Mountin DIN, surface
Applications Low and medium voltage motors

Related products