Trouble Shooting
82
OV1
Over-voltage when
acceleration
OV2
Over-voltage when
deceleration
OV3
Over-voltage
when constant
speed running
1. Dec time is too short and
regenerative energy from the
motor is too large.
2. Input voltage is too high.
1. Increase Dec time or
connect braking resistor
2. Decrease input
voltage within
specification.
UV
DC bus
Under-voltage
1. Open phase occurred with
power supply.
2. Momentary power loss
occurred
3. Wiring terminals for input
power supply are loose.
4. Voltage fluctuations in
power supply are too large.
Inspect the input power
supply or wiring.
OL1 Motor overload
1. Motor drive heavy load at
low speed for a long time.
2. Improper V/F curve
3. Improper motor’s overload
protection threshold (PB.01)
4. Sudden change of load.
1. Select variable
frequency motor.
2. Check and adjust V/F
curve.
3. Check and adjust
PB.01
4. Check the load.
OL2 Inverter overload
1. Load is too heavy or
Acc/Dec time is too short.
2. Improper V/F curve
3. Capacity of inverter is too
small.
1. Increase Acc/Dec
time or select bigger
capacity inverter.
2. Check and adjust V/F
curve.
3. Select bigger capacity
inverter.
SPI Input phase failure
1. Open-phase occurred in
power supply.
2. Momentary power loss
occurred.
3. Wiring terminals for input
power supply are loose.
4. Voltage fluctuations in
power supply are too large.
5. Voltage balance between
phase is bad.
Check the wiring,
installation and power
supply.
SPO
Output phase
failure
1. There is a broken wire in
the output cable
2. There is a broken wire in
the motor winding.
3. Output terminals are
loose.
Check the wiring and
installation.
EF External fault
Sx: External fault input
terminal take effect.
Inspect external
equipment.
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