7.4 Fault
274 YASKAWA SIEPC71061753C GA500 Technical Manual
Code Name Causes Possible Solutions
rF Braking Resistor Fault
The resistance of the dynamic braking option
connected to the drive is too low.
Use a dynamic braking option that fits the model and duty rating
of the drive.
A regenerative converter or regenerative unit is
connected to the drive.
Set L8-55 = 0 [Internal DB TransistorProtection = Disable].
Note:
Do a Fault Reset to clear the fault.
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.
Note:
• The drive detects this error if the braking resistor overheat protective function is active.
• The magnitude of the braking load causes the braking resistor overheat alarm, NOT the surface temperature. If the duty cycle is higher than the braking resistor rating, the
drive will show the alarm.
• Do a Fault Reset to clear the fault.
• Parameter L8-01 enables and disables rH detection.
Code Name Causes Possible Solutions
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.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
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.
Note:
• The drive detects this error if there is a short circuit or ground fault on the drive output side, or an IGBT failure.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
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.
Note:
Do a Fault Reset to clear the fault.
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