Motor & Starter Protection
20
Motor Insulation (option)
Operational when motor is not running (the motor must
be galvanically isolated). Two distinct level can be set
for Alarm and Trip functions.
• Alarm level, Range: 0.2 – 5 M
• Trip level, Range : 0.2 – 5 M
When insulation decreases below Alarm Level set
point for more than 120 sec., the LCD displays
ALARM:
INSULATION LEVEL and shows the value in M.
The Fault LED flashes and the Insulation Alarm Relay
is activated.
Alarm signal will disappear automatically 60 seconds
after insulation level returns to normal. Trip does not
reset automatically.
When insulation decreases below Trip Level set point,
the LCD displays TRIP: INSULATION LEVEL and
shows the value in Mohm. The fault LED illuminates
and Fault Relay is activated.
Motor Thermistor (option – Analogue Card)
Measures motor’s thermistor resistance and trips the
starter when level decreases below set level. Only one
of the optional cards can be fitted in one starter,
Analogue card or Insulation card.
Thermistor Type: Selectable PTC or NTC.
Trip Level, range: 1 – 10 K
Delay: Factory preset time delay of 2 sec.
Too Many Starts
Combines three parameters:
• Number of Starts
Determines maximum allowable number of
starts.
Range: Off, 1-10 starts.
• Start Period
Time period during which Number of Starts is
being counted. Range: 1-60 min.
• Start inhibit
Determines time period during which starting 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
Rst: ___ 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
Becomes operational when starter is energized and has
two Trip functions:
• Trips the starter when current exceeds 850% of
starter’s FLC setting in 1 cycle or less.
• During run (after RUN LED is lit) – Trips the starter
when current exceeds set level and time delay.
Range: 200 - 850% of motor FLA setting
Delay: 0 – 5 sec. (0=up to 200 mSec)
Note: The O/C Shear-Pin is not intended to replace the
fast acting fuses, required to protect the thyristors
(see fuse table in the appendix).
Overload (O/L)
Inverse time electronic overload
becomes operational when RUN
LED is lit.
The O/L circuitry incorporates a
Thermal Memory Register
calculating heating minus
dissipation of the motor. The
starter trips when the register
fills up. The thermal register
resets itself 15 minutes after
motor stops.
t
I%
500115
10
1
Adjustable between 75-150% of motor’s FLA and
factory set at 115%.
Tripping time at 500% FLA is adjustable between 1-10
sec. Allowing trip curve selection.
ATTENTION
Overload protection is not operative during soft-start
or soft stop.
Under Current
Operational when motor is running. Trips the starter
when motor current drops below set Under Current
Trip (UCT) for a time longer than Under Current Delay
(UCD).
Under Current Trip, Range: 0=Off, 20-90% of FLA
Under Current Delay. Range: 1-40 sec.
Under Voltage
Becomes operational only after start signal. Trips the
starter when main voltage drops below the set Under
Voltage Trip (UVT) for a time longer than Under
Voltage Delay (UVD).
Under Voltage Trip, Range: 120-600V (phase to phase)
Under Voltage delay, range 1-10 sec.
Note:
When voltage drops to zero (full voltage outage) the
starter will trip immediately, overriding the delay.
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