Multilin SR469 - Overload Alarm; Mechanical Jam

4. SETPOINT PROGRAMMING S6 CURRENT ELEMENTS
4-41
4.7.2 OVERLOAD ALARM
y
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y
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FUNCTION:
If enabled as Latched or Unlatched, the Overload Alarm will function as follows: After a motor start, when the equivalent motor heating
current exceeds the Overload Pickup, an alarm will occur. If programmed as unlatched, the alarm will reset itself when the motor is no
longer in overload. If programmed as latched, once the overload condition is gone, the reset key must be pressed to reset the alarm.
Event recording for all alarm features is optional.
EXAMPLE:
It may be desirable to have an unlatched alarm connected
to a PLC that is controlling the load on a motor.
4.7.3 MECHANICAL JAM
y
#0(&+$1,&$/#-$0
y
#>(17(5@#IRU#PRUH
Õ
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Õ
ENTER
ENTERENTER
ENTER
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7ULS
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FUNCTION:
If turned On, the Mechanical Jam element will function as follows: After a motor start, once the magnitude of any one of either Ia, Ib, or
Ic exceeds the Pickup Level × FLA for a period of time specified by the Delay, a Trip will occur. This feature 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 that may occur if motor starting torque persists on jammed or broken equip-
ment.
The pickup level for the Mechanical Jam Trip should be set higher than motor loading during normal operations, but lower than the motor
stall level. Normally the delay would be set to the minimum time delay, or set such that no nuisance trips occur due to momentary load
fluctuations.