Digital Operator Display Fault Name
CPF22 Hybrid IC Failure
Cause Possible Solution
Hybrid IC failure on the power board
• Cycle power to the drive.
• If the problem continues, replace the power board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the power board.
Digital Operator Display Fault Name
CPF23
Control Board Connection Error
Connection error between the control board and the drive
Cause Possible Solution
Hardware is damaged
• Turn off the power and check the connection between the control board and the drive.
• If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
Digital Operator Display Fault Name
CPF24
Drive Unit Signal Fault
The drive capacity cannot be detected correctly (drive capacity is checked when the drive is powered up).
Cause Possible Solution
Hardware is damaged
If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
Digital Operator Display Fault Name
to
CPF26 to CPF34
Control Circuit Error
CPU error
Cause Possible Solution
Hardware is damaged
If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
Digital Operator Display Fault Name
dEv
Speed Deviation (for Control Mode with PG)
The deviation between the speed reference and speed feedback is greater than the setting in F1-10 for
longer than the time set to F1-11.
Cause Possible Solution
Load is too heavy Reduce the load.
Acceleration and deceleration times are set too
short
Increase the acceleration and deceleration times (C1-01 through C1-08).
The load is locked up Check the machine.
Parameters are not set appropriately Check the settings of parameters F1-10 and F1-11.
Incorrect speed feedback scaling when using
terminal RP as speed feedback input in V/f
control
• Set H6-02 to the same value as the speed feedback signal frequency when the motor runs at maximum
speed.
• Adjust the speed feedback signal using parameters H6-03 through H6-05.
• Make sure the speed feedback signal frequency does not exceed the maximum input frequency of
terminal RP.
Motor brake is engaged Ensure the motor brake releases properly.
Digital Operator Display Fault Name
dv1
Z Pulse Fault
The motor turned one full rotation without the Z Pulse being detected.
Cause Possible Solution
PG encoder is disconnected, improperly
wired, or the PG option card or PG encoder are
damaged
• Make sure the PG encoder is properly connected and all shielded lines are properly grounded.
• If the problem continues after cycling power, replace either the PG option card or the PG encoder.
Digital Operator Display Fault Name
dv2
Z Pulse Noise Fault Detection
The Z Pulse is out of phase by more than 5 degrees for the number of times specified in parameter F1-17.
Cause Possible Solution
Noise interference along the PG cable Separate the PG cable lines from the source of the noise.
PG cable is not wired properly Rewire the PG encoder and properly ground all shielded lines.
PG option card or the PG encoder is damaged If the problem continues after cycling power, replace the PG option card or the PG encoder.
6.4 Fault Detection
302
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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