YASKAWA T1000A Technical Manual page 279

Digital Operator Display
Cause
Load is too heavy.
Acceleration and deceleration times are set too short.
The load is locked up.
Parameters are not set appropriately.
Incorrect speed feedback scaling if terminal RP is used
as speed feedback input in V/f control.
Motor brake engaged.
Digital Operator Display
Cause
PG encoder is not connected, not wired properly, or is
damaged.
Digital Operator Display
Cause
Noise interference along the PG cable.
PG cable is not wired properly.
PG option card or the PG encoder is damaged.
Digital Operator Display
Cause
The Z pulse 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 PG cable affecting the A or
B pulse.
PG encoder is disconnected, not wired properly, or the
PG option card or PG itself is damaged.
Rotational direction for the PG encoder set to F1-05 is
the opposite of the order of the motor lines.
Digital Operator Display
Cause
The Z pulse offset is not set properly to E5-11.
Noise interference along the PG cable affecting the A or
B pulse.
PG encoder is disconnected, not wired properly, or the
PG option card or PG itself is damaged.
Digital Operator Display
Cause
Disconnection in the motor coil winding.
Loose output terminals.
Digital Operator Display
Cause
An external fault was received from the PLC with other
than F6-03 = 3 "alarm only" (the drive continued to run
after external fault).
Problem with the PLC program.
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Speed Deviation (for Control Mode with PG)
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.
• 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.
Ensure the motor brake releases properly.
Z Pulse Fault
dv1
The motor turned one full rotation without the Z pulse being detected.
• Make sure the PG 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 PG 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 PG cable lines from the source of the noise (very possibly drive output wiring).
Rewire the PG encoder and make sure all shielded lines are properly grounded.
If the problem continues after cycling power, then replace either the PG option card or the PG encoder itself.
Inversion Detection
dv3
The torque reference and acceleration are in opposite directions from one another (one is in reverse and the other is forward)
while at the same time the speed reference and actual motor speed differ by over 30% for the number of pulses set to F1-18.
Set the value for Δθ to E5-11 as specified on the motor nameplate. Replacing the PG encoder or changing the application so that
the motor rotates in reverse instead requires readjustment of the Z pulse offset.
• Make sure the motor is rotating in the right direction.
• Look for any problems on the load side that might be causing the motor to rotate in the opposite direction.
Rewire the PG encoder and make sure all lines including shielded line are properly connected.
Make sure motor lines for each phase (U, V, W) are connected properly.
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: Disable inverse detection in applications where the motor may rotate in the opposite direction of the speed reference.
Setting F1-19 to 0 disables this feature.
• Set the value for Δθ 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 PG encoder itself. Replacing the PG
encoder or changing the application so that the motor rotates in reverse instead requires readjustment of the Z-pulse 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 PG encoder and make sure all lines including shielded line are properly connected.
• If the problem continues after cycling power, then replace either the PG option card or the PG encoder itself.
Initial Polarity Estimation Timeout
dv7
Drive was unable to detect polarity within the specified time.
Measure the motor line-to-line resistance and replace the motor if the motor coil winding is disconnected.
Check for loose terminals. Apply the tightening torque specified in the Technical manual or Quick Start Guide to fasten the
terminals.
Option Card External Fault
EF0
An external fault condition is present.
• Remove the cause of the external fault.
• Remove the external fault input from the PLC.
Check the PLC program and correct problems.
6.4 Fault Detection
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
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