Undercurrent - GE 469 Instruction Manual

S6 Current Elements

Undercurrent

UNDERCURRENT
GE Multilin
PATH: SETPOINTS S6 CURRENT ELEM.
[ ] BLOCK UNDERCURRENT
FROM START: 0 s
UNDERCURRENT
MESSAGE
ALARM: Off
ASSIGN ALARM RELAYS:
MESSAGE
Alarm
UNDERCURRENT ALARM
MESSAGE
PICKUP: 0.70 x FLA
UNDERCURRENT ALARM
MESSAGE
DELAY: 1 s
UNDERCURRENT ALARM
MESSAGE
EVENTS: Off
UNDERCURRENT
MESSAGE
TRIP: Off
ASSIGN TRIP RELAYS:
MESSAGE
Trip
UNDERCURRENT TRIP
MESSAGE
PICKUP: 0.70 x FLA
UNDERCURRENT TRIP
MESSAGE
DELAY: 1 s
A trip or alarm will occurs once the magnitude Ia, Ib, or Ic falls below the pickup
level × FLA for the time specified by the
Undercurrent element is active only when the motor is running. It is blocked upon
the initiation of a motor start for the time defined by the
setpoint (e.g. this block may be used to allow pumps to build up head before the
undercurrent element trips). A value of "0" means the feature is not blocked from
start. If a value other than "0" is entered, the feature is disabled when the motor is
stopped and also from the time a start is detected until the time entered expires.
The
UNDERCURRENT ALARM PICKUP
during normal operations.
For example, if a pump is cooled by the liquid it pumps, loss of load may mean that
the pump overheats. In this case, enable the undercurrent feature. If the motor
loading should never fall below 0.75 × FLA, even for short durations, the
UNDERCURRENT TRIP PICKUP
to "0.75". If the pump is always started loaded, the
PICKUP
setpoint should be disabled (programmed as "0").
FROM START
The
UNDERCURRENT ALARM DELAY
as possible, i.e. 1 second.
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UNDERCURRENT
Range: 0 to 15000 s in steps of 1
Range: Off, Latched, Unlatched
Range: Alarm, Alarm & Auxiliary2,
Range: 0.10 to 0.95 x FLA in steps of
Range: 1 to 60 s in steps of 1
Range: On, Off
Range: Off, Latched, Unlatched
Range: Trip, Trip & Auxiliary2, Trip &
Range: 0.10 to 0.99 x FLA in steps of
Range: 1 to 60 s in steps of 1
UNDERCURRENT ALARM DELAY
level should be set lower than motor loading
could be set to "0.70" and the
or
UNDERCURRENT TRIP DELAY
469
Motor Management Relay
Alarm & Aux2 & Aux3,
Auxiliary2, Aux2 & Aux3,
Auxiliary3
0.01
Aux2 & Aux3, Trip & Auxiliary3
0.01
. The
U/C BLOCK FROM START
UNDERCURRENT ALARM
BLOCK UNDERCURRENT
is typically set as quick
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