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Series: MPS

MPS Series - Motor Protection System
Product Status| Activei
MPS-family
Littelfuse-MPS-family
MPS-CTU
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The MPS series Motor Protection System offers comprehensive voltage protection and starter control for medium voltage motors. The system monitors voltage, current, and temperature to provide a comprehensive package of protective functions. The MPS is a modular system with integrated protection, motor control, metering, and data-logging functions. This system is typically used to provide protection for three-phase low- and medium-voltage, medium to high-horsepower induction motors.

Operation
The Control Unit (MPS-CTU) is the core module. It can operate as a standalone unit or with the Operator Interface (MPS-OPI), RTD Modules (MPS-RTD), and Differential Module (MPS-DIF). The CTU can be programmed using the OPI or the communications network. Programmable inputs and outputs provide a flexible hardware platform and custom software can be easily loaded from a PC to the CTU’s flash memory.

Operator Interface (MPS-OPI)

  • Large, bright, 4 x 20 vacuum-fluorescent display
  • Display metered values
  • Access set points
  • Powered by Control Unit
  • Panel mount or attach directly to Control Unit
  • Remote mounting (1.2 km or 4000 ft maximum loop length)
  • 1/2 DIN size
  • Hazardous-location certified

    • Control Unit (MPS-CTU)
  • Current inputs—5-A or 1-A secondary phase current transformers
  • Voltage inputs—up to 600 V without PTs
  • Earth-leakage input—5-A or 1-A secondary or sensitive transformer
  • Tachometer (high-speed pulse) input
  • 8 digital inputs, 5 relay outputs, 1 analog input and output
  • 24-Vdc supply for OPI and RTD modules, and for digital inputs
  • IRIG-B time-code input
  • 1/2 DIN size, surface mount
  • RS-485 network communications (Standard)
  • DeviceNet™, Profibus®, or Ethernet communications available

    • Overload
    • Current unbalance/Phase loss/Phase reverse
    • Overcurrent/Jam
    • Undercurrent
    • Ground fault
    • RTD temperature
    • Overvoltage
    • Undervoltage
    • Voltage unbalance
    • Phase differential
    • Extends motor life and prevents insulation failures and fires
    • Prevents overheating and extends motor life
    • Prevents catastrophic failures and fires and extends motor life
    • Detects low-level or no-load conditions
    • Prevents catastrophic failures and fires
    • Optional RTD temperature protection (MPS-RTD module) for high ambient or loss of ventilation protection
    • Prevents stress to insulation
    • Prevents a start attempt when it will damage the motor
    • Detects unhealthy supply voltage
    • Provides sensitive protection for high-resistance winding faults

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    • Motor protection

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