7.4 Faults
254 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
7.4 Faults
This section gives information about 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 smart device with DriveWizard Mobile
installed is too far from the keypad.
Use the smart device 10 m (32.8 ft.) or nearer to the keypad.
Note:
bCE can occur when the smart device is 10 m or nearer to the
keypad depending on the specifications of the smart device.
Radio waves from a different device are causing
interference with communications between the
smart device 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 operating the drive with a smart device using the Bluetooth LCD keypad.
• Do a Fault Reset to clear the fault.
• Set the stopping method for this fault in o2-27 [BLE Disconn.Selection@BLE Ctrl].
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 [DB IGBT Protection = 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 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.
• 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.
The option card is incorrectly installed to the drive. Correctly install the option card to the drive.
The option card is damaged. If the fault continues and the wiring is correct, replace the option
card.
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 [Comm.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 or the communications cable
is not connected.
• Repair short circuits and connect cables.
• Replace the defective communications cable.
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