23
The following failure codes indicate problems (Schneider)
Display
Content
Cause
Corrective action
USF
Undervoltage
• Line supply too low
• Transient voltage dip
Check if the power voltage is
correct.
TJF
OHF
The inverter IGBT
is overheated.
Drive overheated.
• Drive temperature too high.
• IGBT internal temperature is
too high according to ambient
temperature and load.
• Ambient temperature is too
high.
• Work being performed is too
heavy.
Improve the ventilation
conditions.
Check the cooling fan.
Wait for the drive to cool before
restarting.
Reduce workload.
OSF
Main overvoltage
• Line voltage too high:
- At drive power-on only, the
supply is 10% over the
maximum acceptable voltage
level.
- Power with no run order, 20%
over the maximum line supply.
• Disturbed line supply.
Check power supply.
Turn Off the machine. Check
and adjust the line voltage.
After line come back to nominal
voltage (within tolerance) do
power On.
SCF 1
SCF 3
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 main circuit
power supply wiring.
Check the cables connecting
the drive to the motors, and
the motor insulations.
OLF
Motor overload
• Triggered by excessive motor
current.
Work being performed is too
heavy. Reduce workload.
SCF 5
Load short circuit
• Short-circuit at drive output.
• Short circuit detection at the
run order or DC injection order.
Check the cables connecting
the drive to the motors, and
the motor’s insulations.
OCF
Overcurrent
• Inertia or load too high
• Mechanical locking
Work being performed is too
heavy.
Check the state of the
mechanisms.
Check the ground connections
of drive, motor cables and
motor insulations.
For all other failure codes: write down the failure code and serial number of the BS-75.
Stop the machine and contact Blastrac.
