YASKAWA CR700, Technical Manual, Page: 342 / 886

6.4 Fault
342 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
6.4 Fault
This section gives information about some of the causes and possible solutions of faults. You must use the Fault
Reset operation to remove the fault before you can operate the drive. Use the information in this table to remove
the cause of the fault.
Code Name Causes Possible Solutions
bAT Keypad Battery Low Voltage The keypad battery voltage is low. Replace the keypad battery.
Note:
Use o4-24 [bAT Detection Selection] to enable/disable bAT detection.
Code Name Causes Possible Solutions
bCE Bluetooth Communication Fault
The smartphone or tablet with DriveWizard Mobile
installed is too far from the keypad.
Use the smartphone or tablet 10 m (32.8 ft) or nearer to the
keypad.
Note:
bCE can occur when the smartphone or tablet is 10 m (32.8 ft)
or nearer to the keypad depending on the specifications of the
smartphone or tablet.
Radio waves from a different device are causing
interference with communications between the
smartphone or tablet and keypad.
Make sure that no device around the keypad uses the same radio
bandwidth (2400 MHz to 2480 MHz), and prevent radio
interference.
Note:
• The drive detects this error when you use the Bluetooth LCD keypad and operate the drive with a smartphone or tablet.
• Do a Fault Reset to clear the fault.
• Set the stopping method for this fault in o2-27 [bCE Detection Selection] .
Code Name Causes Possible Solutions
boL BrakingTransistor Overload Fault
The duty cycle of the braking transistor is high (the
regeneration power or repetition frequency is high).
• Install a braking unit (CDBR-series).
• Install a regenerative converter.
• Increase the deceleration time.
You enabled the protective function for the braking
transistor when you have a regenerative converter.
Set L8-55 = 0 [Internal DB TransistorProtection = Disable] .
The braking transistor in the drive is broken. Replace the entire drive.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
bUS Option Communication Error The drive did not receive a signal from the
controller.
The communications cable wiring is incorrect.
Correct wiring errors.
There is a short-circuit in the communications cable
or the communications cable is not connected.
• Repair short circuits and connect cables.
• Replace the defective communications cable.
Electrical interference caused a communication data
error.
• 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.
• Separate 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.
The option is incorrectly installed to the drive. Correctly install the option to the drive.
The option is damaged. If the fault continues and the wiring is correct, replace the option.
Note:
• The drive detects this error if the Run command or frequency reference is assigned to the option card.
• Do a Fault Reset to clear the fault.
• If the drive detects this error, the drive will operate the motor as specified by the stopping method set in F6-01 [Communication Error Selection] .
Code Name Causes Possible Solutions
CE Modbus Communication Error
The communications cable wiring is incorrect. Correct wiring errors.
There is a short circuit in the communications cable
or the communications cable is not connected.
• Repair short circuits and connect cables.
• Replace the defective communications cable.