6.3 Fault Detection
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
C P F 3 5
CPF35
A /D Conversion Error
A n A /D conversion error or control circuit error occurred.
C a u s e
P o s s ib le S o l u t i o n
A /D conversion is damaged.
Control circuit is damaged.
• 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.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
d E u
dEv
Speed D eviation (for Control M ode with Encoder)
The deviation betw een the speed reference and speed feedback is greater than the setting in F1-10 for longer than the tim e set to
F1-11.
C a u s e
P o s s ib le S o l u t i o n
Load is too heavy.
Reduce the load.
A ccel/decel ramp is too short.
Increase the acceleration and deceleration tim es (C1-01 through C1-08).
The load is locked up.
Check the machine.
Parameters are not set appropriately.
Check the settings o f parameters F1-10 and F1-11.
The motor brake is not applied.
Ensure the motor brake operates properly with a brake control command from the drive.
During R escue Operation, either the DC bus voltage
dropped below S4-12
X
(S4-13 - 10%), or 100 m s after
triggering Rescue Operation, the DC bus voltage did not
reach S4-12
X
S4-13 before the motor started.
• Check the DC bus voltage setting for R escue Operation (S4-12).
• Lower the speed reference set for Rescue Operation (d1-25).
• Check the backup power supply. It may need to be replaced with another UPS if it has becom e worn and can no longer provide
enough power.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
d u i
dv1
Encoder Z Pulse Fault
The motor turned one full rotation without the Z Pulse being detected.
C a u s e
P o s s ib le S o l u t i o n
Encoder is not connected, not wired properly, or is
damaged.
• 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.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
d u E
dv2
Z Pulse N o ise Fault Detection
The Z pulse is out o f phase by more than 5 degrees for the number o f tim es specified in parameter F1-17.
C a u s e
P o s s i b l e S o l u t i o n
N oise interference along the encoder cable.
Separate the encoder cable lines from the source o f the noise.
Encoder cable is not wired properly.
Rewire the encoder and make sure all shielded lines are properly grounded.
PG option card or the encoder is damaged.
If the problem continues after cycling power, replace the PG option card or the encoder.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
d u 3
dv3
Inversion Detection
The torque reference and acceleration are in opposite directions and the speed reference and actual motor speed differ by over
30% for the number o f times set to F1-18.
C a u s e
P o s s ib le S o l u t i o n
The encoder offset is not set properly to E5-11.
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 o f the encoder offset.
A n external force on the load side has caused the motor
to move.
• Make sure the motor is rotating in the right direction.
• Look for any problems on the load side that m ight cause the motor to rotate in the opposite direction.
N oise interference along the encoder cable is disturbing
the encoder signals.
Properly rewire the PG encoder and connect all lines including shielded line.
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 o f the order o f the motor lines.
Properly connect the motor lines for each phase (U/T1, V/T2, W/T3).
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
d u 4
dv4
Inversion Prevention Detection
Pulses indicate that the motor is rotating in the opposite direction o f the speed reference. Set the number o f pulses to trigger
inverse detection to F1-19.
N o t e :
Set F1-19 to 0 to disable inverse detection in applications where the motor may rotate in the opposite direction o f the speed
reference.
C a u s e
P o s s ib le S o l u t i o n
The encoder offset is not set properly to E5-11.
• Set the encoder offset to E 5 -1 1 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 o f the encoder offset.
N oise interference along the encoder cable is disturbing
the encoder signals.
• Make sure the motor is rotating in the correct direction.
• Look for any problems on the load side that m ight be causing the motor to rotate in the opposite direction.
Encoder is disconnected, not wired properly, or the PG
option card or the encoder itself is damaged.
• 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.
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YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
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