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S2 PROTECTION
5–20
The load protection settings are programmed as follows:
•
UNDERPOWER ALARM LEVEL: Appears if
feature functions the same as the underpower trip feature but produces an alarm
indication instead of a trip.
•
UNDERPOWER ALARM DELAY: Appears if
ALARM LEVEL
are not "OFF". Enter a delay for activation of the underpower alarm.
•
UNDERPOWER TRIP LEVEL: Appears if
applications such as pumps, the underpower trip feature or the undercurrent trip
feature can be selected to detect loss of load. The advantage of the underpower trip
feature is that it allows for more accurate sensing if the loss of load results in only a
small change in current and a power factor shift. If the power remains below this
value while the motor is running for the time specified in the
, the MM3 Motor Manager 3 will trip. Set this value to "OFF" if no underpower trip
DELAY
is required.
•
UNDERPOWER TRIP DELAY: Appears if
are not "OFF". Set the
LEVEL
nuisance trips from momentary power dips.
•
ACCELERATION TIME ALARM: Enter a time longer than the actual acceleration time of
the motor. This is defined as the length of time required for the average motor current
to drop below full load current after a start command.
•
ACCELERATION TIME TRIP: Enter the maximum allowable acceleration time of the
motor. This is defined as the length of time required for the average motor current to
drop below full load current after a start command.
•
LOAD INCREASE ALARM: Set to a suitable level if a warning is required when motor
current is approaching, or in, an overload condition. When current exceeds this value,
a load increase alarm will occur. Set to "OFF" if not required.
•
UNDERCURRENT ALARM LEVEL: This feature functions the same as the undercurrent
trip feature but produces an alarm indication instead of a trip.
•
UNDERCURRENT ALARM DELAY: Enter the delay for activation of the undercurrent
alarm.
•
UNDERCURRENT TRIP LEVEL: An undercurrent trip can be selected for applications
such as pumps. If the current remains below this value while the motor is running for
the time specified in the
trip. Set this value to "OFF" if no undercurrent trip is required.
•
STALLED ROTOR TRIP LEVEL: Mechanical equipment such as pumps or fans can be
quickly damaged by jams, resulting in a locked rotor stall. Even though the motor may
be able to withstand the locked rotor for a long time, it may be desirable to trip the
motor as soon as the stall condition occurs. The MM3 Motor Manager 3 will trip when
the running current exceeds this value after the stalled rotor time. Set this value to
"OFF" if stall protection of driven equipment is not required since the thermal overload
protection will protect the motor. This feature is defeated during the inrush of motor
starting.
•
STALLED ROTOR TRIP DELAY: If the
than "OFF", the MM3 Motor Manager 3 will trip after the time specified by this setpoint.
VT PRIMARY VOLTAGE
VT PRIMARY VOLTAGE
VT PRIMARY VOLTAGE
VT PRIMARY VOLTAGE
UNDERPOWER TRIP DELAY
UNDERCURRENT TRIP DELAY
STALLED ROTOR TRIP LEVEL
MM3 MOTOR MANAGER 3 – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
is not "OFF". This
and
UNDERPOWER
is not "OFF". For
UNDERPOWER TRIP
and
UNDERPOWER TRIP
long enough to prevent
, the MM3 Motor Manager 3 will
is set to a value other
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