25
Table 16 — Trip Messages for 50BV VFD (cont)
ERROR
CODE
COMMUNICATION
NO.
PROBLEM POSSIBLE CAUSES REMEDIES
OP3 C Overvoltage during
constant-speed
operation
• The input voltage fluctuates abnormally.
(1) The power supply has a capacity of
200kVA or more.
(2) A power factor improvement capacitor is
opened or closed.
(3) A system using a thyristor is connected
to the same power distribution line.
• The motor is in a regenerative state
because the load causes the motor to run at
a frequency higher than the inverter
output frequency.
• Insert a suitable input reactor.
• Install a dynamic braking resistor.
OL1 D Inverter overload • The acceleration ACC time is too short.
• The DC braking amount is too large.
• The V/F setting is improper.
• A restart signal is input to the rotating
motor after a momentary stop, etc.
• The load is too large.
• Increase the acceleration time ACC.
• Reduce the DC braking amount F251
and the DC braking time F252.
• Check the V/F parameter setting.
• Use F301 (auto-restart) and F302
(ride-through control).
• Use an inverter with a larger rating.
OL2 E Motor overload • The V/F setting is improper.
• The motor is locked up.
• Low-speed operation is performed
continuously.
• An excessive load is applied to the motor
during operation.
• Check the V/F parameter setting.
• Check the load (operated machine).
• Adjust OLN to the overload that the
motor can withstand during operation in a
low speed range.
*EPHO 9 Output phase failure • A phase failure occurred in the output line
of the main circuit.
• Check the main circuit output line, motor,
etc., for phase failure.
• Enable F605 (Output phase failure
detection).
*EPH1 8 Input phase failure • A phase failure occurred in the input line
of the main circuit.
• Check the main circuit input line for phase
failure.
• Enable F608 (input phase failure
detection).
OH2 2Eh External thermal trip • A thermal trip command is entered from
an external input device.
• Check the external input device.
*Ot 20h Over-torque trip • The load torque rises up to the over-torque
detection level during operation
• Enable F615 (Over-torque trip selection)
• Check whether the system is in a normal
condition.
OLr F Dynamic braking
resistor overload trip
• The deceleration time is too short.
• The dynamic braking amount is too large.
• Increase the deceleration time dEC.
• Use a dynamic resistor with a larger
capacity (W) and adjust F308 (PBR
capacity parameter) accordingly.
OH 10h Overheat • The cooling fan does not rotate.
• The ambient temperature is too high.
• The vent is blocked up.
• A heat generating device is installed close
to the inverter.
• The thermistor in the unit is broken.
• Restart the operation by resetting the
inverter after it has cooled down enough.
• The fan requires replacement if it does
not rotate during operation.
• Secure sufficient space around the
inverter.
• Do not place any heat-generating device
near the inverter.
•Makeaservicecall.
*UP1 1E Undervoltage trip
(main circuit)
• The input voltage (in the main circuit) is
too low.
• Check the input voltage.
• Enable F627 (undervoltage trip
selection).
• To cope with a momentary stop due to
undervoltage, enable F302 (ride-through
control) and F301 (auto-restart).
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