19 Troubleshooting
106 YASKAWA TOEPC71061732E HV600 Drive Installation & Primary Operation
Code Name Causes Possible Solutions
The relay or contactor on the soft-charge bypass relay
is damaged.
U4-06 [PreChargeRelayMainte] 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.
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.
VLTS Thermostat Fault
The digital input from the terminal set for Thermostat
Fault [H1-xx = 88] is active.
Examine the wiring or wait for the motor to cool.
◆ 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
AFBL Analog Fbk Lost, Switched to Net
The analog input source is defective or broken. • Make sure that you install the PID Feedback source and it
operates correctly.
• If the drive does not have an analog PID Feedback source, set
Y9-02 = 3 [System Feedback Source = Network Only] to set the
drive to read the network PID Feedback from another drive.
The parameter setting is H3-xx ≠ B [MFAI Function
Selection ≠ PID Feedback].
• Set H3-xx = B to use the analog input source for PID Feedback.
• If the drive does not have an analog PID Feedback source, set
Y9-02 = 3.
AuDis Low PI Aux Fdbk Drive Disabled
• Parameter setting of Y9-51 = 1 [PI Aux Control
Turn-Off Method = Enabled] does not let the drive
operate in Memobus Multiplex.
• PI Auxiliary Feedback is less than the YF-06 [PI
Aux Control Wake-up Level] setting, and the drive
is stopped or running as a Lag drive.
• Make sure that the YF-06 setting is correct.
• Wait for the PI Auxiliary Feedback to recover.
AUXFB PI Aux Feedback Level Loss
The analog input from the terminal set to H3-xx = 27
[MFAI Function Selection = PI Auxiliary Control
Feedback Level] is more than 21 mA or less than 3
mA for longer than 1 s.
Repair transducer or wiring.
AuFbl PI Aux Fdbk Lost Switched to Net
The analog input source is defective or broken. • Make sure that you install the Auxiliary PI Feedback source and
it operates correctly.
• Make sure that the YF-19 [PI Aux Ctrl Feedback WireBreak]
setting is correct.
• If there is no analog feedback, set Y9-50 = 3 [PI Auxiliary
Control Source = Network Only] to set the drive to read the
network Auxiliary PI Feedback from another drive.
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.
Move to 10 m (32.8 ft) or less from the keypad.
Note:
bCE can occur when the smartphone or tablet is 10 m (32.8 ft)
or nearer to the keypad for different smartphone and tablet
specifications.
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.
BuDif Main Fdbk Lost, Using Diff Fdbk
Parameter Y4-41 = 1 [Diff Lvl Src Fdbk Backup
Select = Enabled] and the drive detected a wire-break
on the analog input terminal set for PID Feedback
[H3-xx = B].
Examine the connection of the Main PID Feedback Transducer.
Main PID Feedback Transducer is broken. Replace Main PID Feedback Transducer.
Bu-Fb Main Fdbk Lost Using Backup Fdbk
The drive detected wire-break on the analog input
terminal set to H3-xx = B [MFAI Function Selection
= PID Feedback].
Examine the connection of the Main PID Feedback Transducer.
Main PID Feedback Transducer is broken. Replace Main PID Feedback Transducer.
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