Motor & Starter Protection
19
1919
19
Too Many Starts
Combines three parameters:
• Number of Starts
Determines the maximum allowable number of
starts.
Range: Off, 1-10 starts. Default: 1
• Start Period
Time period when number of starts is being
counted. Range: 1-60 min. Default: 20 Min.
• Start inhibit
Determines time period when start signal is
disabled after “Too many starts” trip.
Range: 1-60 min
Note:
Motor can not be started before “Start Inhibit
Time” has elapsed. Trying to start the motor
during this time delay will result in LCD
displaying “Wait Before Restart: ___ MIN.
Long Start Time – (Stall Protection)
Trips the starter if motor does not reach full speed
during “Maximum Start Time”.
Range: 1-30 sec. (consult factory for extended range).
Over Current Shear-pin trip
Operational when starter is energized and has two
functions:
•
Trips the starter when current exceeds 850%
of starter’s FLC setting in 1 cycle or less.
•
850% FLA with delay during start (850%
overrides O\L settings.
•
During run (after RUN LED is on) it trips the
starter if current exceeds set level and time
delay.
Range: 100 - 850% of motor FLA setting
Delay: 0 – 5 sec. (0=up to 200 msec)
Note:
The O/C Shear-Pin trip is not intended to replace
the fast acting fused. It is required to protect the
thyristors (see fuse table in the appendix).
Overload (OL)
Inverse time electronic overload
becomes operational when RUN
LED is on.
The OL circuitry incorporates a
Thermal Memory Register, which
calculates the heat less the
dissipation of the motor. The starter
trips when the register fills up.
The thermal register resets itself 15
minutes after the motor stops.
t
I%
500115
10
1
The value is adjustable within 75-150% of motor FLA
and factory pre-set at 115%.
Tripping time at 500% FLA is adjustable within 1-10
seconds to allow trip curve selection.
ATTENTION
Overload protection is not operative during soft-
or soft-stop.
Under Current
Operational when motor is running. Trips the starter
when motor current drops below under current trip
(UCT) set point for a period of time longer than under
current delay (UCD).
Under Current Trip range: 0 = Off, 20-90% of FLA
Under Current Delay range: 1-40 sec.
Auto Reset
A special feature enables auto reset after adjustable
time delay. Range: Off, 10-120 min.
Under Voltage / No Voltage
Operational after start signal. It trips the starter when
main voltage drops below the Under Voltage Trip set
point for a period of time longer than Under Voltage
Delay.
Auto reset can be activated via Fault Parameters. Auto
reset is activated 60 seconds after trip occurred.
Under Voltage Trip range: 50-90% Un (Line to Line)
Under Voltage delay range: 1-10 sec.
Note:
1.
When voltage drops to zero (voltage outage)
the starter will trip immediately, overriding
the delay.
2.
Auto reset can not be activated if start signal
is still connected.
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