S9 Voltage Elements; Undervoltage - GE 469 Instruction Manual

469
Motor Management Relay

Undervoltage

UNDERVOLTAGE
5–64

S9 Voltage Elements

PATH: SETPOINTS S9 VOLTAGE ELEM.
[ ] U/V ACTIVE ONLY IF
BUS ENERGIZED: No
UNDERVOLTAGE
MESSAGE
ALARM: Off
ASSIGN ALARM RELAYS:
MESSAGE
Alarm
UNDERVOLTAGE ALARM
MESSAGE
PICKUP: 0.85 x RATED
STARTING U/V ALARM
MESSAGE
PICKUP: 0.85 x RATED
UNDERVOLTAGE ALARM
MESSAGE
DELAY: 3.0 s
UNDERVOLTAGE ALARM
MESSAGE
EVENTS: Off
UNDERVOLTAGE
MESSAGE
TRIP: Off
UNDERVOLTAGE TRIP
MESSAGE
MODE: 1-Phase
ASSIGN TRIP RELAYS:
MESSAGE
Trip
UNDERVOLTAGE TRIP
MESSAGE
PICKUP: 0.80 x RATED
STARTING U/V TRIP
MESSAGE
PICKUP: 0.80 x RATED
UNDERVOLTAGE TRIP
MESSAGE
DELAY: 3.0 s
The
U/V ACTIVE ONLY IF BUS ENERGIZED
alarms or trips when the bus is not energized. If this setpoint is programmed to
"Yes", at least one voltage must be greater than 20% of the nominal nameplate
voltage rating for any alarm/trip. If the load is high inertia, it may be desirable to
trip the motor off-line or prevent it from starting in the event of a total loss of line
voltage. Programming "No" for this setpoint ensures that the motor is tripped and
may be restarted only after the bus is re-energized.
If the undervoltage alarm feature is enabled, an alarm will occur once the
magnitude of either Vab, Vbc, or Vca falls below the pickup level while running or
starting for a period of time specified by the delay (note that pickup levels are
multiples of motor nameplate voltage). The running pickup level also applies when
the motor is stopped and the
programmed to "No".
Undervoltage trips can be set for single-phase or three-phase conditions. If
undervoltage tripping is enabled, and the
Phase", a trip will occur only when the magnitude of all three phases falls below the
pickup level while running or starting for a period of time specified by the time
delay. On the other hand, if undervoltage trip is enabled, and the
is set for "1-Phase", a trip will occur once the magnitude of either Vab, Vbc, or
MODE
Vca falls below the pickup level while running or starting for a period of time
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UNDERVOLTAGE
Range: No, Yes
Range: Off, Latched, Unlatched
Range: Alarm, Alarm & Auxiliary2,
Alarm & Aux2 & Aux3, Alarm &
Auxiliary3, Auxiliary2, Aux2 &
Aux3, Auxiliary3
Range: 0.60 to 0.99 x RATED in steps of
0.01
Range: 0.60 to 1.00 x RATED in steps of
0.01. Enter "1.00" to turn this
function off.
Range: 0.0 to 60.0 s in steps of 0.1
Range: On, Off
Range: Off, Latched, Unlatched
Range: 1-Phase, 3-Phase
Range: Trip, Trip & Auxiliary2, Trip &
Aux2 & Aux3, Trip & Auxiliary3
Range: 0.60 to 0.99 x RATED in steps of
0.01
Range: 0.60 to 1.00 x RATED in steps of
0.01. Enter "1.00" to turn this
function off.
Range: 0.0 to 60.0 s in steps of 0.1
setpoint may be used to prevent nuisance
U/V ACTIVE ONLY IF BUS ENERGIZED
UNDERVOLTAGE TRIP MODE
S9 Voltage Elements
setpoint is
is set for "3-
UNDERVOLTAGE TRIP
GE Multilin