GE MOTOR MANAGEMENT RELAY 469 User Manual

4-48 469 Motor Management Relay GE Power Management
4.7 S6 CURRENT ELEMENTS 4 SETPOINT PROGRAMMING
4
4.7.4 UNDERCURRENT
a) FUNCTION
A trip or alarm will occurs once the magnitude Ia, Ib, or Ic falls below the pickup level
×
FLA for the time speci-
fied by the
UNDERCURRENT ALARM DELAY
. 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
U/C BLOCK FROM START
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
level should be set lower than motor loading during normal operations.
b) 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
could be set to
"0.70"
and the
UNDERCURRENT ALARM PICKUP
to
"0.75"
. If the pump is
always started loaded, the
BLOCK UNDERCURRENT FROM START
setpoint should be disabled (programmed as 0).
•the
UNDERCURRENT ALARM DELAY
/
UNDERCURRENT TRIP DELAY
is typically set as quick as possible, i.e. 1 s.
y
UNDERCURRENT
y
[ENTER] for more
BLOCK UNDERCURRENT
FROM START: 0 s
Range: 0 to 15000 sec., step: 1
UNDERCURRENT
ALARM: Off
Range: Off, Latched, Unlatched
ASSIGN ALARM RELAYS:
Alarm
Range: Alarm, Alarm & Auxiliary2, Alarm & Aux2 & Aux3,
Auxiliary2, Aux2 & Aux3, Auxiliary3
UNDERCURRENT ALARM
PICKUP: 0.70 x FLA
Range: 0.10 to 0.95 x FLA, step: 0.01
UNDERCURRENT ALARM
DELAY: 1 s
Range: 1 to 60 sec., step: 1
UNDERCURRENT ALARM
EVENTS: Off
Range: On, Off
UNDERCURRENT
TRIP: Off
Range: Off, Latched, Unlatched
ASSIGN TRIP RELAYS:
Trip
Range: Trip, Trip & Auxiliary2, Trip & Aux2 & Aux3,
Trip & Auxiliary3
UNDERCURRENT TRIP
PICKUP: 0.70 x FLA
Range: 0.10 to 0.99 x FLA, step: 0.01
UNDERCURRENT TRIP
DELAY: 1 s
Range: 1 to 60 sec., step: 1
ENTER
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GE MOTOR MANAGEMENT RELAY 469 Specifications

General

Brand	GE
Model	MOTOR MANAGEMENT RELAY 469
Category	Relays
Language	English