Schneider Electric Altivar 12 Manual De Usuario

108

BBV28581  05/2010

OCF

Overcurrent

• Parameters in the 

Motor control 

menu 

drC-

 page 

 are not 

correct

• Inertia or load too high
• Mechanical locking

• Check the parameters
• Check the size of the motor/drive/load
• Check the state of the mechanism
• Connect line chokes
• Reduce the 

Switching frequency

 

page 

• Check the ground connection of drive, motor 

cable and motor insulation.

SCF1

Motor short circuit

• Short-circuit or grounding at the 

drive output

• Ground fault during running status
• Commutation of motors during 

running status

• Significant current leakage to 

ground if several motors are 
connected in parallel

• Check the cables connecting the drive to the 

motor, and the motor insulation

• Connect motor chokes

SCF3

Ground short circuit

SCF4

IGBT short circuit

• Internal power component short 

circuit detected at power on

• Contact your local Schneider Electric 

representative

SOF

Overspeed

• Instability
• Overspeed associated with the 

inertia of the application

• Check the motor
• Overspeed is 10% more than 

Maximum 

frequency

 

 page 

 so adjust this 

parameter if necessary

• Add a braking resistor
• Check the size of the motor/drive/load
• Check parameters of the speed loop (gain 

and stability)

tnF

Auto-tuning

• Motor not connected to the drive
• One motor phase loss
• Special motor
• Motor is rotating (being driven by 

the load, for example)

• Check that the motor/drive are compatible
• Check that the motor is present during auto-

tuning

• If an output contactor is being used, close it 

during auto-tuning

• Check that the motor is completely stopped