Multilin SR469 - Overvoltage; Phase Reversal

S9 VOLTAGE ELEMENTS 4. SETPOINT PROGRAMMING
4-56
4.10.2 OVERVOLTAGE
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FUNCTION:
If enabled, once the magnitude of either Va, Vb, or Vc rises above the Pickup Level for a period of time specified by the Delay, a trip or
alarm will occur. (Pickup levels are multiples of motor nameplate voltage).
An overvoltage on running motor with a constant load will result in decreased current. However, iron and copper losses increase, caus-
ing an increase in motor temperature. The current overload relay will not pickup this condition and provide adequate protection. There-
fore, the overvoltage element may be useful for protecting the motor in the event of a sustained overvoltage condition.
4.10.3 PHASE REVERSAL
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FUNCTION:
The SR469 can detect the phase rotation of the three phase voltage. If the Phase Reversal feature is turned on when all 3 phase volt-
ages are greater than 50% motor nameplate voltage and the phase rotation of the three phase voltages is not the same as the setpoint,
a trip and block start will occur in 500ms to 700ms.
NOTE: This feature does not work when single VT operation is enabled.