Trouble Shooting
103
Fault Code
Fault Type
Reason
Solution
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.03)
4. Sudden change of
load.
1. Select variable
frequency motor.
2. Check and adjust
V/F curve.
3. Check and adjust
PB.03
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.
OH1
Rectify
overheat
OH2 IGBT
overheat
1
．
Ambient temperature is
too high.
2
．
Near heat source.
3. Cooling fans of inverter
stop or damaged.
4
．
Obstruction of
ventilation channel
5
．
Carrier frequency too
high.
1. Install cooling unit.
2. Remove heat source.
3. Replace cooling fan
4. Clear the ventilation
channel.
5. Decrease carrier
frequency.
EF External
fault
Sx: External fault input
terminal take effect.
Inspect external
equipment.
CE
Communication
fault
1. Improper baud rate
setting.
2. Receive wrong data.
3. Communication is
interrupted for Long time
1. Set proper baud rate.
2. Check
communication devices
and signals.
