Overvoltage; Phase Reversal - GE 469 Instruction Manual

4.10 S9 VOLTAGE ELEMENTS
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PATH: SETPOINTS S9 VOLTAGE ELEMENTS
n OVERVOLTAGE
n [ENTER] for more
4
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 results in decreased current. However, iron and copper losses
increase, causing an increase in motor temperature. The current overload relay will not pickup this condition and provide
adequate protection. Therefore, the overvoltage element may be useful for protecting the motor in the event of a sustained
overvoltage condition.
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PATH: SETPOINTS S9 VOLTAGE ELEMENTS
n PHASE REVERSAL
n [ENTER] for more
The 469 can detect the phase rotation of the three phase voltage. If the Phase Reversal feature is turned on when all 3
phase voltages 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 500 to 700 ms.
This feature does not work when single VT operation is enabled.
NOTE
4-58
Courtesy of NationalSwitchgear.com
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OVERVOLTAGE

ð
OVERVOLTAGE
ENTER
ESCAPE ALARM: Off
ASSIGN ALARM RELAYS:
ESCAPE
Alarm
MESSAGE
OVERVOLTAGE ALARM
ESCAPE
MESSAGE PICKUP: 1.05 x RATED
OVERVOLTAGE ALARM
ESCAPE
DELAY: 3.0 s
MESSAGE
OVERVOLTAGE ALARM
ESCAPE
EVENTS: Off
MESSAGE
OVERVOLTAGE
ESCAPE
TRIP: Off
MESSAGE
ASSIGN TRIP RELAYS:
ESCAPE
Trip
MESSAGE
OVERVOLTAGE TRIP
ESCAPE
PICKUP: 1.10 x RATED
MESSAGE
OVERVOLTAGE TRIP
ESCAPE
DELAY: 3.0 s
MESSAGE
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PHASE REVERSAL

ð
PHASE REVERSAL
ENTER
ESCAPE TRIP: Off
ASSIGN TRIP RELAYS:
ESCAPE
Trip
MESSAGE
469 Motor Management Relay
4.10.2 OVERVOLTAGE
Range: Off, Latched, Unlatched
Range: Alarm, Alarm & Auxiliary2, Alarm & Aux2 & Aux3,
Alarm & Auxiliary3, Auxiliary2, Aux2 & Aux3,
Auxiliary3
Range: 1.01 to 1.10 x RATED in steps of 0.01
Range: 0.5 to 60.0 s in steps of 0.1
Range: On, Off
Range: Off, Latched, Unlatched
Range: Trip, Trip & Auxiliary2, Trip & Aux2 & Aux3,
Trip & Auxiliary3
Range: 1.01 to 1.10 x RATED in steps of 0.01
Range: 0.5 to 60.0 s in steps of 0.1
4.10.3 PHASE REVERSAL
Range: Off, Latched, Unlatched
Range: Trip, Trip & Auxiliary2, Trip & Aux2 & Aux3,
Trip & Auxiliary3
4 SETPOINTS
GE Multilin