74
z
Fault trip memory ... The cause of the trip is saved in parameters P67 to P70.
The details on the latest trip and the three prior trips is saved even if the
power is turned OFF. (The details of the shipment inspection are saved
when the unit is shipped.)
Display
Details and cause of faults
Remedies
SC1 •
Instantaneous
overcurrent
during acceleration or abnormal
heating of heat sink fins
• Check for an output short-circuit
or ground fault
• Check the ambient temperature
and fan operation
• Increase the acceleration time
SC2 •
Instantaneous
overcurrent
during constant speed or
abnormal heating of heat sink
fins
• Check for output short-circuit
and ground fault
• Check ambient temperature
and fan operation
• Eliminate excessive changes in
load
SC3 •
Instantaneous
overcurrent
during deceleration or abnormal
heating of heat sink fins
• Check for output short-circuit
and ground fault
• Check ambient temperature
and fan operation
• Increase the deceleration time
OC1
• Overcurrent during acceleration
• Check for an open output phase
• Increase the acceleration time
• Adjust the torque boost level
OC2
• Overcurrent during constant
speed
• Check for an open output phase
• Eliminate excessive changes in
load
OC3
• Overcurrent during deceleration
• Check for an open output phase
• Increase the deceleration time
OU1
• Excessive internal DC voltage
during acceleration
• Increase the acceleration time
OU2
• Excessive internal DC voltage
during constant speed
• Eliminate excessive changes in
load
OU3
• Excessive internal DC voltage
during deceleration
• Increase the deceleration time
LU
• Power supply voltage drops to
less than 85% of rating
• Measure the power supply
voltage
• Consider using the
instantaneous power failure
restart function
OL
• An output current exceeding
125% of the electronic thermal
setting current or 140% or more
of the inverter rated current
occurs for more than 1 minute
• Check the electronic thermal
setting current
• Check and adjust the torque
boost level
• Reduce the load
Individual Details and Remedies
for Fault Trips