r
Indicator lamp
oc2:
Steady speed
overcurrent
Possible cause
Checkup
Remedy
Overcurrent
Is load changed
Eliminate sudden
suddenly?, load change,
Is output short-
circuited?
oc3:
Deceleration
overcurrent
Is deceleration too
Prolong deceleratior
fast? time.
Is output short-
circuited?
THM:
Overload alarm
Motor. thermal relay Is motor overloaded? Lighten load.
Change motor/
inverter capacity.
THT:
Inverter thermal relay
Overload alarm
OLT:
Stall prevention
UVT:
Under voltage
Long-lasting action
Is motor overloaded? Lighten load.
of stall preventive Change motor/
function inverter capacity.
Low power supply Is a motor having Check power supply
voltage
a large capacity
line.
(connected in the,
same power line)
started?
GF:
Ground fault
overcurrent
Ground fault in
output line
Is output line or Check output line
motor short-circuited and motor, and
to ground? remove short-
circuiting.
OHT:
Thermal relay provided Does motor Lighten load or
External thermal in external circuit is overheat?
duty.
relay trip activated.
OPT: Option unit is not
Is connector engaged Securely engage
Built-in option connected to inverter securely. connector.
unit connection properly.
failure
If an indicator lamp lights, the motor stops after coasting.
To resume motor operation,
remove the cause, reset the protective function
and restart the inverter.
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