MPU-32 Series – Motor Protection Unit Series

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.

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Motor Protection Unit

  • Three ac-current inputs
  • Earth-leakage-CT input
  • Programmable digital input
  • 24 V dc source for digital input
  • Programmable 4–20-mA analog output
  • Onboard temperature-sensor input
  • 100-Ω-Platinum RTD or PTC
  • Three programmable output relays
  • Local RS-232 communications, optional network communications
  • PC-interface software (SE-Comm-RIS)
  • 4 line x 20 character backlit LCD display
  • Keypad for programming and display selection
  • 4 LEDs; 1 user programmable

Current Input Module (MPU-CIM) The MPU-CIM Current Input Module is the interface between the MPU-32 relay and the 5-A-secondary, 1-A-secondary, and sensitive current transformers. The MPU-CIM is ordered separately from the MPU-32 and can be surface- or DIN-rail mounted. Wire-clamping terminals are standard, but the MPUCTI is available for those requiring ring-tongue terminals.

Features

  • Overload
  • Dynamic thermal model
  • Communications
  • Ground fault
  • Current unbalance/Phase loss/Phase reverse (current)
  • RTD temperature
  • Phase loss/Phase reverser (current)
  • Overcurrent
  • Jam
  • Undercurrent
  • PTC overtemperature
  • Starts per hour
  • Differential

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

Warranty                                                10 years

Control Unit Mounting                            Panel (standard), Surface (with MPU-32-SMK converter kit)

Current Input Module Mounting                DIN, Surface

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