Unitronics UMI-B1 UL Series Operation Manual page 107

UMI-B1 UL Series Inverter
Fault
Fault type
code
SPO Output phase loss
OH1 Rectify overheat
OH2 IGBT overheat
EF External fault
Communication
CE
Current detection
ItE
tE Autotuning fault
Possible cause
of input R,S,T
U,V,W phase loss input
(or serious asymmetrical
three phase of the load)
1. Air duct jam or fan
damage
2. Ambient temperature is
too high.
3. The time of overload
running is too long.
SI external fault input
terminals action
1. The baud rate setting
is incorrect.
2. Fault occurs to the
communication wiring.
3. The communication
error
address is wrong.
4. There is strong
interference to the
communication.
1. The connection of the
control board is not good
2. Assistant power is bad
3. Hoare components is
fault
broken
4. The modifying circuit is
abnormal.
1. The motor capacity
does not comply with the
inverter capability
105
Fault tracking
Solutions
2. Check installation
distribution
1. Check the output
distribution
2. Check the motor and
cable
1. Refer to the
overcurrent solution
2. Redistribute
dredge the wind channel
or change the fan
3. Low the ambient
temperature
4. Check and reconnect
5. Change the power
6. Change the power unit
7. Change the main
control panel
Check the external device
input
1. Set proper baud rate
2. Check the
communication
connection distribution
3. Set proper
communication address.
4. Chang or replace the
connection distribution or
improve the
anti-interference
capability.
1. Check the connector
and repatch
2. Change the Hoare
3. Change the main
control panel
1. Change the inverter
mode
2. Set the rated