Trouble Shooting
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Upon fault – motor stops. Fault LED light on and Fault Relay operates. The LCD shows TRIP and fault description.
Upon Alarm – motor continues running. Alarm Relay operates and Fault LED flashes. The LCD shows ALARM and
fault description.
UNBALANCE
TRIP
Current Unbalance is the difference between maximum and minimum values of motor three
line currents divided by motor maximum current or motor FLA, whichever is greater. Fault
occurs when the actual Unbalance is greater than the setpoint for more than “Unbalance
Delay”.
GND FAULT TRIP
It operates when Ground Current exceeds the preset “GND FAULT TRIP” for more than
“GND FAULT DLY”.
PWR ON & NO
START
It operates upon main voltage connection and activated when main voltage is connected to
the HRVS-DN for more than 30 seconds without a start signal.
BY-PASS OPEN
It operates when the by-pass contactor did not close after EOA contact of the HRVS-DN
closes.
Note: This protection can be disable by setting By Pass open trip to disable when the By
Pass is connected in a separate in a separate cabinet such that the starter CT’s do not
measure motor current when the By Pass contactor is closed.
TOO MANY
STARTS
Trips the starter if number of starts during “Start Period” exceeds the preset number. You
have to wait until the motor and the starter cool down according to “Start Inhibit” setting.
LONG START
TIME
Trips the starter if output voltage does not reach nominal at the preset max. start time. Check
FLA, FLC, and max. start time settings. Increase Initial Voltage, Current Limit & max. start
time or decrease acceleration Time as necessary.
O/C – SHEAR PIN
Trips the starter:
1.
Instantaneously when current exceeds 8.5 x Starter
FLC.
2.
If current exceed 8.5 x Motor FLA during starting with
adj. delay.
3.
If current exceed 100-850% during running with adj.
delay.
CAUTION
soft-start is connected!!!
O/C Shear-Pin has a programmable delay of 0-5 seconds where the starter detects the fault
and does not trip before time delay has elapsed (delay is overridden when current reaches
8.5 x Starter FLC).
Check that motor is not installed or Jammed.
Check FLA, FLC settings.
Check motor and cable connections.
Perform a “Megger” test to verify motor and cables condition
OVERLOAD
Trips the starter when current exceed the Overload Trip level and thermal register has filled
up.
Check FLA, FLC and Overload settings, check the motor current, wait 15 minutes to let the
motor and the starter to cool down before restarting.
UNDER CURRENT
Trips the starter when line current drops below the preset level for the preset time.
Check “Under Current Trip” and “Time Delay” settings and check line currents through L
1
,
L
2
and L
3
.
UNDER VOLTAGE
Trips the starter when line voltage drops below the preset level for the preset time.
Check “Under Voltage Trip “ and “Time Delay” settings and check the line voltages on
L
1
, L
2
and L
3
.
When voltage drops to zero, the starter trips immediately with no delay.
OVER VOLTAGE
Trips the starter when line voltage increases above a preset level for a preset time.
Check “Over Voltage Trip” and “Time Delay” settings. Check line voltage on L
1
, L
2
and L
3
.
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