95 • Trouble Shooting
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9.
TROUBLE SHOOTING
Upon fault – motor stops,
Fault
LED lights and Fault Relay chances position. The LCD shows TRIP: < fault
description>. (for example: TRIP: UNDER CURRENT).
INSULATION
ALARM
(Optional) Alarms when the motor insulation level decreases below the level set.
Alarm ceases automatically 60 seconds after resistance exceeds the level set.
Check motor and cable insulation.
For INSULATION ALARM/TRIP protection settings refer to section
INSULATION TRIP
(Optional) Trips the RVS-DN when the motor insulation level decreases below the
trip level set.
Check motor and cable insulation level.
For INSULATION ALARM/TRIP protection settings refer to section
THERMISTOR
TRIP
(Optional) Trips the RVS-DN when the motor thermistor resistance decreases
below trip level set.
Check resistance of the thermistor and cables; check motor temperature near
thermistor location.
For THERMISTOR TRIP protection setting refer to section
TOO MANY
STARTS
Trips the RVS-DN if the number of starts, during STARTS PERIOD exceeds the
preset number.
Wait until motor and RVS-DN cool down – according to NUMBER OF STARTS,
STARTS PERIOD and START INHIBIT settings. Refer to section
LONG START
TIME
Trips the RVS-DN 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 ACC. TIME as necessary.
For start parameters settings refer to section
O/C – SHEAR PIN
Trips the RVS-DN when:
•
Instantaneously when current exceeds 8.5 x RVS-DN FLC
•
During starting when current exceeds 8.5 x Motor FLA
•
During running when current exceeds 200-850%
O/C Shear-Pin has a programmable delay of 0-5 seconds where the RVS-DN
detects the fault and does not trip before time delay has elapsed (delay is overriden
when current reaches 8.5 x RVS-DN FLC).
Check that motor is not stalled or jammed.
Check FLA, FLC settings.
Check motor and cable connections.
Perform a “Megger” test to verify motor and cable’s condition.
For protection parameters settings refer to section
CAUTION
Check that “Megger” maximum voltage is no more than 500V!
Disconnect terminal 21 before performing a “Megger” test.
OVERLOAD
Trips the RVS-DN when current exceeds the OVERLOAD TRIP level and the
thermal register has filled up.
Check FLA, FLC and overload settings and check motor current, then wait at least
15 minutes to let the motor and RVS-DN cool down before restarting.
For protection parameters settings refer to section
UNDER CURRENT
Trips the RVS-DN when line current drops below the preset level for the preset
time.
Check UNDERCURR. TRIP and UNDERCURR. DELAY settings; check line
currents through L1, L2, L3.
For protection parameters settings refer to section