TROUBLE SHOOTING
7-12
Possible Causes What to Check and Suggested Measures
3. Inter – phase
unbalance rate of three
phase voltage was too
large.
Measure the input voltage.
→ Connect an AC reactor (ACR) or a DC reactor (DCR) to lower
the rate.
→ Raise the inverter capacity.
4. Overload cyclically
occurred.
Measure ripple wave of DC link circuit voltage.
→ If the ripple is large, raise the inverter capacity.
5. Single – phase voltage
was inputted to the
inverter instead of
three – phase voltage
input.
Check the inverter type.
→ Change the inverter to one for single – phase voltage input.
5. “OPL” Output phase loss protection
Problem Output phase loss occurred.
Possible Causes What to Check and Suggested Measures
1. Inverter output wires
are broken
Measure the output current.
→ Replace the output wires.
2. Wire for motor
winding are broken
Measure the output current.
→ Replace the motor.
3. The terminal screws
for inverter output
were not tight enough.
Check if any terminal screws have become loose.
→ Tighten the terminal screws to the recommended torque.
4. A single-phase motor
has been connected
Single – phase motor cannot be used. Note that the FRENIC – Mini
only drives three – phase induction motors.
6. “OH1” Overheat protection for heat sink
Problem Temperature around heat sink rose.
Possible Causes What to Check and Suggested Measures
1. Temperature around
the inverter exceeded
that of inverter
specifications.
Measure the temperature around the inverter.
→ Lower the temperature around the inverter (e.g. ventilate the
enclosure well).
→ Lighten the load.
2. Accumulated running
time of the cooling fan
exceeded the standard
period for
replacement, or the
cooling fan
malfunctioned
Check the accumulated running time (E52=2). Refer to “Reading
Maintenance Information”.
→ Replace the cooling fan.
Visually check that the cooling fan rotates normally.
→ Replace the cooling fan.
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