| Three Phase Voltage Monitors |
| Provide protection against: |
| Undervoltage and Overvoltage - Can cause motor overheating - Startup difficulties - Long term insulation damage - Overvoltage can cause internal arching - Both shorten motor life |
| Unbalanced Voltages - Can cause motor overheating in both stator windings and rotor bars - Can result in winding insulation failure - Most difficult fault to detect - Shortens motor life |
| Phase Loss - Most destructive fault condition - Motors may stall and fail in seconds - Motors cannot start under load |
| Phase Reversal - 3 phase motors may run backwards - May damage rotational sensitive equipment |
| Power Outages (Short Cycling) - Can result in short cycling - Often accompanied by low voltages - Some voltage monitors are available with time delays to prevent rapid restarting |
| Current Sensors |
| Will sense AC currents from 0.5A to 50A in ranges (see specifications) Sense Overcurrent or Undercurrent or Window current Trip Delays prevent nuisance tripping. |
Copyright 2001 SSAC Inc Revised 02/04/04
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