Low voltage motors (defined as motors under 1000V) need different protection measures than their higher voltage cousins. Proper motor protection and monitoring in conjunction with a good maintenance schedule will extend the life of your motor and driven application significantly; as well as prevent unscheduled downtime and costly repairs due to easy to prevent failures. Below you will find our three tiers of recommendations for low voltage motor protection.

Good

  • Electronic Overload Relay            
    • Includes monitoring of overload, loss of phase, phase unbalance, and ground faults.
  • Short Circuit Protection
    • Fuses or circuit breakers are permissible.

Better

  • Programmable Motor Protector
    • Includes programmable monitoring of voltage, amperage, kilowattage, etc. As well as a digital display, digital communications, trip class, recloser protection, and undercurrent monitoring.
  • Short Circuit Protection
    • Fuses or circuit breakers are permissible.
  • Optional: Temperature Monitoring
    • A thermostat or resistance temperature detection method is permissible.

Best

  • Multifunction Protective Relay
    • Includes programmable monitoring of motor waveforms, ground faults, rotor and stator temperature predictive algorithms, harmonic monitoring, resistance temperature detection, zero sequence, differential options, etc.
  • Short Circuit Protection
    • Fuses or circuit breakers are permissible.
  • Resistance Temperature Detection
  • Optional: Zero Sequence CT and Vibration and/or Shock Pulse Monitoring

This article is based off our EMC Webinar: Getting the Most out of Your Electric Motor


Got More Motor Questions? We Can Help!

Call 800-595-5315 Or Connect With Our Expert Technicians Here:


Other Articles

LEAVE A REPLY

Please enter your comment!
Please enter your name here