Overload Alarm; Mechanical Jam - GE 469 Instruction Manual

4 SETPOINTS
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PATH: SETPOINTS S6 CURRENT ELEMENTS
n OVERLOAD ALARM
n [ENTER] for more
If enabled as "Latched" or "Unlatched", the Overload Alarm functions as follows. After a motor start, when the equivalent
motor heating current exceeds the
load alarm resets itself when the motor is no longer in overload. If programmed as "Latched", the
pressed to reset the alarm once the overload condition is gone. Event recording for all alarm features is optional.
For example, it may be desirable to have an unlatched alarm connected to a PLC that is controlling the load on a motor.
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PATH: SETPOINTS S6 CURRENT ELEMENTS
n MECHANICAL JAM
n [ENTER] for more
If turned On, the Mechanical Jam element function as follows. After a motor start, a Trip occurs once the magnitude of Ia,
Ib, or Ic exceeds the Pickup Level × FLA for a period of time specified by the
may be used to indicate a stall condition when running. Not only does it protect the motor by taking it off-line quicker than
the thermal model (overload curve), it may also prevent or limit damage to the driven equipment if motor starting torque
persists on jammed or broken equipment.
The
MECHANICAL JAM PICKUP
motor stall level. Normally the delay is set to the minimum time delay or set so that no nuisance trips occur due to momen-
tary load fluctuations.
GE Multilin
Courtesy of NationalSwitchgear.com
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OVERLOAD ALARM

ð
OVERLOAD
ENTER
ESCAPE ALARM: Off
ASSIGN ALARM RELAYS:
ESCAPE
Alarm
MESSAGE
OVERLOAD ALARM
ESCAPE
MESSAGE DELAY: 0.1 s
OVERLOAD ALARM
ESCAPE
EVENTS: Off
MESSAGE
OVERLOAD PICKUP LEVEL
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MECHANICAL JAM

ð
MECHANICAL JAM
ENTER
ESCAPE TRIP: Off
ASSIGN TRIP RELAYS:
ESCAPE
Trip
MESSAGE
MECHANICAL JAM
ESCAPE
PICKUP: 1.50 x FLA
MESSAGE
MECHANICAL JAM
ESCAPE
DELAY: 1 s
MESSAGE
level should be set higher than motor loading during normal operation, but lower than the
469 Motor Management Relay
4.7 S6 CURRENT ELEMENTS
Range: Off, Latched, Unlatched
Range: Alarm, Auxiliary2, Auxiliary3, Alarm & Aux2,
Alarm & Aux3, Aux2 & Aux3, Alarm & Aux2 &
Aux3
Range: 0.1 to 60 s in steps of 0.1
Range: On, Off
, an alarm will occur. If programmed as
Range: Off, Latched, Unlatched
Range: Trip, Trip & Auxiliary2, Trip & Aux2 & Aux3;
Trip & Auxiliary3
Range: 1.01 to 3.00 x FLA in steps of 0.01
Range: 1 to 30 s in steps of 1
MECHANICAL JAM DELAY
4.7.2 OVERLOAD ALARM
Unlatched
, the over-
RESET
key must be
4.7.3 MECHANICAL JAM
setpoint. This feature
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