7200 TROUBLESHOOTING
E - 3
2.1 Overcurrent [oC]
If overcurrent is detected [OC] will appear on the inverter display. The following
conditions may be the cause of this error:
1. Excessive load inertia.
2. Acceleration time is too short -- increase it.
3. Starting frequency is set too high.
4. Motor connections are incorrect -- verify proper voltage connection.
5. If a motor brake is used, brake coil cannot be fed from the inverter output
terminals.
6. Phase-to-phase or phase-to-ground short at the inverter output -- check for
short in wiring or motor.
2.2 Overvoltage [oV]
[oV] will be displayed on the inverter if overvoltage occurs. This error can occur if
the deceleration time is set too fast for load inertia. To correct this problem,
increase the deceleration time.
2.3 Undervoltage [Uv]
If undervoltage is detected, [Uv] will be displayed on the inverter. Low input
voltage is the cause of this error. Check for low voltage at inverter input terminals.
This can be caused by instantaneous power failure or a brownout.
2.4 Overheating [oH]
If overheating occurs, [oH] will be displayed on the inverter. If this error occurs,
check the cooling fans (if applicable) and/or clean the cooling fins on heat sinks. If
the fans are operating properly and the fins are clean, check for excessive ambient
temperature.
2.6 Motor Overload [oL1]
When a motor overload is detected, [oL1] is displayed on the inverter. When this
error occurs, restart the inverter and check output current. If it is higher than the
specifications on the nameplate, correct the overload.
2.6 Drive Overload [oL2]
When a drive overload is detected, [oL2] is displayed on the inverter. Be sure the
drive’s capacity is correctly rated.
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