19 Troubleshooting
118 YASKAWA TOEPC71061737B GA800 Drive Installation & Primary Operation
Code Name Causes Possible Solutions
Uv2 Control Power Undervoltage
The value set in L2-02 [Power Loss Ride Through
Time] increased and the momentary power loss
recovery unit is not connected to the drive.
Connect the momentary power loss recovery unit to the drive.
Uv3 Soft Charge Answerback Fault
The relay or contactor on the soft-charge bypass relay
is damaged.
• Re-energize the drive.
• If the fault stays, replace the control board or the drive.
• Check monitor U4-06 [PreChargeRelayMainte], which shows
the performance life of the soft-charge bypass relay. If U4-06 is
more than 90%, replace the board or the drive. For information
about replacing the board, contact Yaskawa or your nearest sales
representative.
◆ Minor Faults/Alarms
This section gives information about the causes and possible solutions when a minor fault or alarm occurs. Use the
information in this table to remove the cause of the minor fault or alarm.
Code Name Causes Possible Solutions
AEr Station Address Setting Error
The node address for the communication option is not
in the permitted setting range.
• For CC-Link communication, set F6-10 [CC-Link Node Address]
correctly.
• For MECHATROLINK communication, set F6-20
[MECHATROLINK Station Address] correctly.
• For CANopen communication, set F6-35 [CANopen Node ID
Selection] correctly.
bAT Keypad Battery Low Voltage
The keypad battery voltage is low. Replace the keypad battery.
bb Baseblock
An external baseblock command was entered through
one of the MFDI terminals Sx, and the drive output
stopped as shown by an external baseblock command.
Examine the external sequence and timing of the baseblock
command input.
bCE Bluetooth Communication Error
The smartphone or tablet with DriveWizard Mobile is
too far from the keypad.
Use the smartphone or tablet within 10 m (32.8 ft) from 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.
boL Braking Transistor Overload
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.
bUS Option Communication Error
The communications cable wiring is incorrect. Correct wiring errors.
CALL Serial Comm Transmission 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 the short-circuited or disconnected portion of the cable.
• Replace the defective communications cable.
A programming error occurred on the controller side. Examine communications at start-up and correct programming
errors.
There is damage to the communications circuitry. • Do a self-diagnostics check.
• If the problem continues, replace the control board or the drive.
Contact Yaskawa or your nearest sales representative to replace
the control board.
The termination resistor setting for MEMOBUS/
Modbus communications is incorrect.
On the last drive in a MEMOBUS/Modbus network, set DIP switch
S2 to the ON position to enable the termination resistor.
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.
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.
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