Unitronics UMI-B1 UL Series Operation Manual page 106

UMI-B1 UL Series Inverter
Fault
Fault type
code
Over-voltage
OV1
when acceleration
Over-voltage
OV2
when deceleration
Over-voltage
OV3 when constant
speed running
DC bus
UV
Under-voltage
OL1 Motor overload
OL2 Inverter overload
OL3 Electrical overload
SPI Input phase loss
Possible cause
7. The overvoltage stall
protection is not open.
1. The input voltage is
abnormal.
2. There is large energy
feedback.
3. No braking
components.
4. Braking energy is not
open
1. The voltage of the
power supply is too low.
2. The overvoltage stall
protection is not open.
1. The voltage of the
power supply is too low.
2. The motor setting rated
current is incorrect.
3. The motor stall or load
transients is too strong.
1. The acceleration is too
fast
2. Reset the rotating
motor
3. The voltage of the
power supply is too low.
4. The load is too heavy.
5. Close loop vector
control, reverse direction
of the code panel and
long low-speed operation
The inverter will report
overload pre-alarm
according to the set
value.
Phase loss or fluctuation
104
Fault tracking
Solutions
interference.
7. Check the setting of
relative function codes.
1. Check the input power
2. Check if the DEC time
of the load is too short or
the inverter starts during
the rotation of the motor
or it needs to increase the
energy consumption
components.
3. Install the braking
components.
4. Check the setting of
relative function codes.
1. Check the input power
of the supply line.
2. Check the setting of
relative function codes.
1. Check the power of the
supply line
2. Reset the rated current
of the motor
3. Check the load and
adjust the torque lift
1. Increase the ACC time
2. Avoid the restarting
after stopping.
3. Check the power of the
supply line
4. Select an inverter with
bigger power.
5. Select a proper motor.
Check the load and the
overload pre-alarm point.
1. Check input power