Details and Remedies for Fault Trips
Fault trip memory..... The cause of the trip can be saved in parameter n12 to n15.
The details on the latest trip and the three prior trips are saved even if the power is turned
OFF. ( The details of the shipment inspection are saved when the unit is shipped.)
Display
SC1
䊶Instantaneous overcurrent during
acceleration or abnormal heating
of heat sink fins
䊶
Check for an output short-circuit or ground faul
䊶Check the ambient temperature
䊶Increase the acceleration time
SC2
䊶Instantaneous overcurrent during
constant speed or abnormal heating
of heat sink fins
䊶Check for output short-circuit or ground fault
䊶Check ambient temperature
䊶Eliminate excessive changes in load
SC3
䊶Instantaneous overcurrent during
deceleration or abnormal heating
of heat sink fins
䊶Check for output short-circuit or ground fault
䊶Check ambient temperature
䊶Increase the deceleration time
OC1 䊶Overcurrent during acceleration
䊶Check for an open output phase and
Eliminate sudden changes in load
䊶Increase the acceleration and deceleration times
䊶Adjust the torque boost level
䊶Check the restart in inertia
䊶Do not switch the electromagnetic
contactor at the load side
OC2
䊶Overcurrent during constant speed
OC3 䊶Overcurrent during deceleration
OU1
䊶Excessive internal DC voltage during
acceleration
䊶Increase the acceleration time
OU2
䊶Excessive internal DC voltage during
constant speed
OU3
䊶Excessive internal DC voltage during
deceleration
䊶Increase the deceleration time
䊶Eliminate excessive changes in load
LU
䊶Power supply voltage drops to less
than 85% of rating
䊶Measure the power supply voltage and Check
output open-phase
䊶Consider using the instantaneous power
failure restart function
OL
䊶An output current exceeding 125%
of the electronic thermal setting current
or 140% or more of the inverter rated
current (3.6A) occurs for more than 1 minute.
䊶Check the electronic thermal setting current
䊶Check and adjust the torque boost level
䊶Reduce the load
AU
䊶The abnormal stop command was sent.
䊶Check the communication processing of controller
OP
䊶The power supply was applied while
the run signal was ON
䊶The run signal was turned ON while
setting data in the stopped mode, and
the mode was returned to the operation
mode with the MODE button
䊶Timeover was detected
䊶The communication connector was
removed during the operation
䊶Check the start mode (parameter P23)
䊶Check the run signal when the data is being set.
䊶Check the communication setting and wirings
䊶Reduce the noise around the inverter
Details and cause of fault Remedies
89
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