Low Voltage Testing

Quality - Integrity - Reliability

PMT is capable of performing low voltage testing on chillers, air handling units, and other assembled equipment.  PMT’s test lab is complete with a 480 VAC variable transformer that can be incrementally adjusted from 237 to 623 VAC (amperage dependent).  PMT can design a test program for your equipment to simulate the line voltage sags your equipment may experience during normal operation, or during start up on your diesel generator in the event of a loss of power.  Example test scenarios that can be implemented are as follows:

Scenario #1

  • Run equipment at steady state at 480 VAC supply voltage and simulate a loss of power
  • Restart equipment 30 seconds later with reduced supply voltage of 360 VAC
  • Run equipment at 360 VAC for minimum of 30 seconds, increase voltage back to 480 VAC

Scenario #2

  • Run equipment at steady state at 480 VAC supply voltage
  • Simulate a voltage sag by dropping the supply voltage to 360 VAC
  • Hold the supply voltage at 360 VAC for minimum 30 seconds
  • Increase supply voltage back to 480 VAC

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