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boL
BrakingTransistor Overload
Fault
bUS
Option Communication
Error
CE
Modbus Communication
Error
CF
Control Fault
YASKAWA ELECTRIC SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
The duty cycle of the braking transistor
is high (the regeneration power or
repetition frequency is high).
You enabled the protective function for
the braking transistor when you have a
regenerative converter.
The braking transistor in the drive is
broken.
The drive did not receive a signal from
the controller.
The communications cable wiring is
incorrect.
There is a short circuit or the
communications cable is not connected.
Electrical interference caused a
communication data error.
The option card is incorrectly installed
to the drive.
The option card is damaged.
The communications cable wiring is
incorrect.
There is a short circuit or the
communications cable is not connected.
Electrical interference caused a
communication data error.
Motor parameters are set improperly.
The torque limit is too low.
The load inertia is too big.
The drive is trying to ramp to stop a
machine that cannot do ramp to stop or
on a machine for which deceleration is
not necessary.
6 Troubleshooting
• Install a braking unit (CDBR-series).
• Install a regenerative converter.
• Increase the deceleration time.
Set L8-55 = 0 [Internal DB TransistorProtection =
Disable].
Replace the entire drive.
Correct wiring errors.
• Repair short circuits and connect cables.
• Replace the defective communications cable.
• Examine the control circuit lines, main circuit
lines, and ground wiring, and decrease the
effects of electrical interference.
• Make sure that a magnetic contactor is not the
source of the electrical interference, then use a
Surge Protective Device if necessary.
• Use only the recommended cables or other
shielded line. Ground the shield on the controller
side or the drive input power side.
• Isolate the communication wiring from drive
power lines, and install a noise filter to the input
side of the power supply for communication.
• Decrease the effects of electrical interference
from the controller.
Correctly install the option card to the drive.
If the fault continues and the wiring is correct,
replace the option card.
Correct wiring errors.
• Repair short circuits and connect cables.
• Replace the defective communications cable.
• Examine the control circuit lines, main circuit
lines, and ground wiring, and decrease the
effects of electrical interference.
• Make sure that a magnetic contactor is not the
source of the electrical interference, then use a
Surge Protective Device if necessary.
• Use only the recommended cables or other
shielded line. Ground the shield on the controller
side or the drive input power side.
• Isolate the communication wiring from drive
power lines, and install a noise filter to the input
side of the power supply for communication.
• Decrease the effects of electrical interference
from the controller.
Correctly set the motor parameters and do Auto-
Tuning again.
Adjust L7-01 to L7-04 [Torque Limit].
• Adjust C1-02, C1-04, C1-06, and C1-08
[Deceleration Times].
• Set the frequency reference to the minimum
output frequency, and stop the Run command
when the drive stops deceleration.
Correctly set b1-03 [Stopping Method Selection].
325
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