YASKAWA L1000A Technical Manual page 288

6.3 Fault Detection
Digital Operator Display
CPF26 to CPF34
to
Cause
Hardware is damaged.
Digital Operator Display
Cause
A/D conversion is damaged.
Control circuit is damaged.
Digital Operator Display
Cause
Load is too heavy.
Accel/decel ramp is too short.
The load is locked up.
Parameters are not set appropriately.
The motor brake is not applied.
During Rescue Operation, either the DC bus voltage
dropped below S4-12 × (S4-13 - 10%), or 100 ms after
triggering Rescue Operation, the DC bus voltage did not
reach S4-12 × S4-13 before the motor started.
Digital Operator Display
Cause
Encoder is not connected, not wired properly, or is
damaged.
Digital Operator Display
Cause
Noise interference along the encoder cable.
Encoder cable is not wired properly.
PG option card or the encoder is damaged.
Digital Operator Display
Cause
The encoder offset is not set properly to E5-11.
An external force on the load side has caused the motor
to move.
Noise interference along the encoder cable is disturbing
the encoder signals.
Encoder is disconnected, not wired properly, or the PG
option card or the encoder itself is damaged.
Rotational direction for the encoder set to F1-05 is the
opposite of the order of the motor lines.
Digital Operator Display
Cause
The encoder offset is not set properly to E5-11.
Noise interference along the encoder cable is disturbing
the encoder signals.
Encoder is disconnected, not wired properly, or the PG
option card or the encoder itself is damaged.
288
Control Circuit Error
CPU error
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.
A/D Conversion Error
CPF35
An A/D conversion error or control circuit error occurred.
• Cycle power to the drive.
• If the problem continues, replace the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
Speed Deviation (for Control Mode with Encoder)
dEv
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.
Reduce the load.
Increase the acceleration and deceleration times (C1-01 through C1-08).
Check the machine.
Check the settings of parameters F1-10 and F1-11.
Ensure the motor brake operates properly with a brake control command from the drive.
• Check the DC bus voltage setting for Rescue Operation (S4-12).
• Lower the speed reference set for Rescue Operation (S4-15).
• Check the backup power supply. It may need to be replaced with another UPS if it has become worn and can no longer provide
enough power.
Encoder Z Pulse Fault
dv1
The motor turned one full rotation without the Z Pulse being detected.
• Make sure the encoder is properly connected and all shielded lines are properly grounded.
• If the problem continues after cycling power, then replace either the PG option card or the encoder itself.
Z Pulse Noise Fault Detection
dv2
The Z pulse is out of phase by more than 5 degrees for the number of times specified in parameter F1-17.
Separate the encoder cable lines from the source of the noise.
Rewire the encoder and make sure all shielded lines are properly grounded.
If the problem continues after cycling power, replace the PG option card or the encoder.
Inversion Detection
dv3
The torque reference and acceleration are in opposite directions and the speed reference and actual motor speed differ by over
30% for the number of times set to F1-18.
Set the encoder offset to E5-11 as specified on the motor nameplate. Replacing the encoder or changing the motor/encoder
rotation direction requires readjustment of the encoder offset.
• Make sure the motor is rotating in the right direction.
• Look for any problems on the load side that might cause the motor to rotate in the opposite direction.
Properly rewire the PG encoder and connect all lines including shielded line.
Properly connect the motor lines for each phase (U/T1, V/T2, W/T3).
Inversion Prevention Detection
Pulses indicate that the motor is rotating in the opposite direction of the speed reference. Set the number of pulses to trigger
dv4
inverse detection to F1-19.
Note: Set F1-19 to 0 to disable inverse detection in applications where the motor may rotate in the opposite direction of the speed
reference.
• Set the encoder offset to E5-11 as specified on the motor nameplate.
• If the problem continues after cycling power, then replace either the PG option card or the encoder itself. Replacing the encoder
or changing the motor/encoder rotation direction requires readjustment of the encoder offset.
• Make sure the motor is rotating in the correct direction.
• Look for any problems on the load side that might be causing the motor to rotate in the opposite direction.
• Rewire the encoder and make sure all lines including shielded line are properly connected.
• If the problem continues after cycling power, replace the PG option card or the encoder.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual