GE 469 User Manual

CHAPTER 5: SETTINGS
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–83
5.11.4 Underpower
PATH: SETTINGS ZV S10 POWER ELEMENTS ZV UNDERPOWER
If enabled, once the magnitude of 3Φ total power falls below the Pickup Level for a period
of time specified by the Delay, a trip or alarm will occur. The Underpower element is active
only when the motor is running and will be blocked upon the initiation of a motor start for a
period of time defined by the
BLOCK ELEMENT FROM START settings (e.g. this block may be
used to allow pumps to build up head before the underpower element trips or alarms). A
value of 0 means the feature is not blocked from start. If a value other than 0 is entered,
the feature will be disabled when the motor is stopped and also from the time a start is
detected until the time entered expires. The pickup level should be set lower than motor
loading during normal operations.
For example, underpower may be used to detect loss of load conditions. Loss of load
conditions will not always cause a significant loss of current. Power is a more accurate
representation of loading and may be used for more sensitive detection of load loss or
pump cavitation. This may be especially useful for detecting process related problems.

UNDERPOWER [
BLOCK UNDERPOWER
FROM START: 0 s
Range: 0 to 15000 s in steps of 1
MESSAGE
UNDERPOWER
ALARM: Off
Range: Off, Latched, Unlatched
MESSAGE
ASSIGN ALARM
RELAYS:
Range: Alarm, Alarm & Auxiliary2,
Alarm & Aux2 & Aux3, Alarm &
Auxiliary3, Auxiliary2, Aux2 &
Aux3, Auxiliary3
MESSAGE
UNDERPOWER ALARM
LEVEL: 2 kW
Range: 1 to 25000 kW in steps of 1
MESSAGE
UNDERPOWER ALARM
DELAY: 1 s
Range: 1 to 30 s in steps of 1
MESSAGE
UNDERPOWER ALARM
EVENTS: Off
Range: On, Off
MESSAGE
UNDERPOWER
TRIP: Off
Range: Off, Latched, Unlatched
MESSAGE
ASSIGN TRIP
RELAYS:
Range: Trip, Trip & Auxiliary2, Trip &
Aux2 & Aux3, Trip & Auxiliary3
MESSAGE
UNDERPOWER TRIP
LEVEL: 1 kW
Range: 1 to 25000 kW in steps of 1
MESSAGE
UNDERPOWER TRIP
DELAY: 1 s
Range: 1 to 30 s in steps of 1

GE 469 Specifications

General

Brand	GE
Model	469
Category	Relays
Language	English