Minor Faults/Alarms - YASKAWA GA800 600 V Drive Installation & Primary Operation

18 Troubleshooting
Code Name
UL3 Undertorque Detection 1
UL4 Undertorque Detection 2
UL5 Mechanical Weakening Detection 2
Uv1 DC Bus Undervoltage
Uv2 Control Power Undervoltage
Uv3 Soft Charge Answerback Fault
◆

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
AEr Station Address Setting Error
bAT Keypad Battery Low Voltage
bb Baseblock
bCE Bluetooth Communication Error
boL Braking Transistor Overload
bUS Option Communication Error
CALL Serial Comm Transmission Error
CE Modbus Communication Error
74
Causes
A fault occurred on the machine.
Example: There is a broken pulley belt.
A fault occurred on the machine.
Example: There is a broken pulley belt.
The drive detected undertorque as specified by the
conditions for mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect Select].
There is a phase loss in the drive input power.
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.
The relay or contactor on the soft-charge bypass relay
is damaged.
Causes
The node address for the communication option is not
in the permitted setting range.
The keypad battery voltage is low.
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.
The smartphone or tablet with DriveWizard Mobile is
too far from the keypad.
Radio waves from a different device are causing
interference with communications between the
smartphone or tablet and keypad.
The duty cycle of the braking transistor is high (the
regeneration power or repetition frequency is high).
The communications cable wiring is incorrect.
The communications cable wiring is incorrect.
There is a short circuit in the communications cable
or the communications cable is not connected.
A programming error occurred on the controller side.
There is damage to the communications circuitry.
The termination resistor setting for MEMOBUS/
Modbus communications is incorrect.
The communications cable wiring is incorrect.
There is a short circuit in the communications cable
or the communications cable is not connected.
YASKAWA TOEPC7106170VA GA800 600 V Drive Installation & Primary Operation
Possible Solutions
Examine the machine and remove the cause of the fault.
Examine the machine and remove the cause of the fault.
Examine the machine for deterioration.
Correct errors with the wiring for main circuit drive input power.
Connect the momentary power loss recovery unit to the drive.
• 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.
Possible Solutions
• 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.
Replace the keypad battery.
Examine the external sequence and timing of the baseblock
command input.
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.
Make sure that no device around the keypad uses the same radio
bandwidth (2400 MHz to 2480 MHz), and prevent radio
interference.
• Install a braking unit (CDBR series).
• Install a regenerative converter.
• Increase the deceleration time.
Correct wiring errors.
Correct wiring errors.
• Repair the short-circuited or disconnected portion of the cable.
• Replace the defective communications cable.
Examine communications at start-up and correct programming
errors.
• 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.
On the last drive in a MEMOBUS/Modbus network, set DIP switch
S2 to the ON position to enable the termination resistor.
Correct wiring errors.
• Repair short circuits and connect cables.
• Replace the defective communications cable.