YASKAWA GA700 Technical Manual page 357

Code Name
rF Braking Resistor Fault
Note:
Do a Fault Reset to clear the fault.
Code Name
rH Braking Resistor Overheat
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.
• L8-01 enables fault detection.
Code Name
rr Dynamic Braking
Transistor Fault
Note:
Do a Fault Reset to clear the fault.
Code Name
SC Short Circuit/IGBT Failure
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.
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Causes
The resistance of the dynamic braking
option that is connected to the drive is
too low.
A regenerative converter, regenerative
unit, or braking unit is connected to the
drive.
Causes
The deceleration time is too short and
excessive regenerative energy is flowing
back into the drive.
The duty cycle is too high.
The braking load is too large.
The braking resistor is not sufficient.
Causes
The drive control circuit is damaged.
There is a malfunction in the internal
braking transistor of the drive.
Causes
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.
Possible Solutions
Use a dynamic braking option that fits the model
and duty rating of the drive.
Set L8-55 = 0 [Internal DB TransistorProtection =
Disable].
Possible Solutions
• Check the load level, deceleration time, and
speed.
• Decrease the load.
• Increase the value set in C1-02, C1-04, C1-06,
or C1-08 [Deceleration Times].
• Use a dynamic braking option that lets you use
more power.
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.
Possible Solutions
• 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.
Possible Solutions
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.
6.4 Faults
6
357