YASKAWA CIPR-GA50UВ001AJ Series Installation & Primary Operation page 138

15 Troubleshooting
Code Name
Dynamic Braking
rr
Transistor Fault
Short Circuit/IGBT
SC
Failure
SCF Safety Circuit Fault
138
Causes
The duty cycle is too high.
The braking load is too heavy.
The braking resistor is not
sufficient.
The drive control circuit is
damaged.
There is a malfunction in the
internal braking transistor of the
drive.
Overheating caused damage to
the motor or the motor
insulation is not satisfactory.
The motor main circuit cable is
contacting ground to make a
short circuit.
A short circuit or ground fault
on the drive output side caused
damage to the output transistor
of the drive.
When A1-02 = 5, 6 [Control
Method Selection = OLV/PM or
AOLV/PM], the output current
is more than the value set in L8-
27 [Overcurrent Detection
Gain].
The safety circuit is broken.
YASKAWA TOEPC7106170YB YASKAWA AC Drive GA500 Installation & Primary Operation
Possible Solutions
Examine the duty cycle.
Note:
When L8-01 = 1 [3% ERF DB
Resistor Protection = Enabled], the
maximum braking duty cycle is 3%.
• Calculate the braking load and
braking power again, and decrease the
braking load.
• Use a braking resistor that improves
braking power.
Use the braking resistor specifications to
select a sufficient braking resistor.
• Re-energize the drive.
• If the fault stays, replace the control
board or the drive. For information
about replacing the control board,
contact Yaskawa or your nearest sales
representative.
Measure the motor insulation resistance,
and replace the motor if there is electrical
conduction or unserviceable insulation.
• Examine the motor main circuit cable
for damage, and repair short circuits.
• Measure the resistance between the
motor main circuit cable and the
ground terminal. If there is electrical
conduction, replace the cable.
• Make sure that there is not a short
circuit in terminal B1 and terminals
U/T1, V/T2, and W/T3. Make sure
that there is not a short circuit in
terminals - and terminals U/T1, V/T2,
and W/T3.
• If there is a short circuit, contact
Yaskawa or your nearest sales
representative.
Set L8-27 correctly.
Replace the control board or the drive.
For information about replacing the
control board, contact Yaskawa or your
nearest sales representative.