13 Troubleshooting
106 YASKAWA TOEPC71061752B GA500 Drive Installation & Primary Operation
Code Name Causes Possible Solutions
rH
Braking Resistor
Overheat
The deceleration time is too short
and excessive regenerative energy
is flowing back into the drive.
• Check the load level, deceleration time,
and speed.
• Decrease the load.
• Increase the values set in C1-02, C1-04,
C1-06, or C1-08 [Deceleration Times].
• Use a dynamic braking option that lets
you use more power.
The duty cycle is too high. Examine the duty cycle.
Note:
When L8-01 = 1 [3% ERF DB Resistor
Protection = Enabled], the maximum
braking duty cycle is 3%.
The braking load is too heavy. • Calculate the braking load and braking
power again, and decrease the braking
load.
• Use a braking resistor that improves
braking power.
The braking resistor is not
sufficient.
Use the braking resistor specifications to
select a sufficient braking resistor.
rr
Dynamic Braking
Transistor Fault
The drive control circuit is
damaged.
There is a malfunction in the
internal braking transistor of the
drive.
• 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.
SC
Short Circuit/IGBT
Failure
Overheating caused damage to the
motor or the motor insulation is
not satisfactory.
Measure the motor insulation resistance, and
replace the motor if there is electrical
conduction or unserviceable insulation.
The motor main circuit cable is
contacting ground to make a short
circuit.
• 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.
A short circuit or ground fault on
the drive output side caused
damage to the output transistor of
the drive.
• 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.
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].
Set L8-27 correctly.
SCF Safety Circuit Fault
The safety circuit is broken. Replace the control board or the drive. For
information about replacing the control
board, contact Yaskawa or your nearest sales
representative.
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