38 YASKAWA ELECTRIC TOBP C730600 75B YASKAWA AC Drive Option PG-B3 Installation Manual
7 Troubleshooting
7 Troubleshooting
u Drive-Side Error Codes
Table 11 lists the various fault codes related to the option and pulse generator. Refer to the
drive Technical Manual for further details on fault codes.
Confirm the following items upon receiving an error notification on the drive keypad:
1. Correct and secure cable connections including ground wiring.
2. Proper option installation.
3. No momentary power loss occurred.
Table 11 Fault Displays, Causes, and Possible Solutions
Keypad 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
The load is too heavy. Reduce the load.
The 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 set
inappropriately.
Check F1-10 and F1-11 settings.
Motor brake is engaged. Ensure the motor brake releases properly.
Keypad Display Fault Name
dv1
Z Channel Pulse Fault Detection
The motor turned one full rotation while failing to detect the Z channel pulse.
Cause Possible Solution
The PG option or PG encoder
are damaged.
1. Confirm that the PG encoder is properly connected and all shielded lines are
properly grounded.
2. Cycle power. Replace the PG option card or the PG encoder if the problem
continues after cycling power.
The PG encoder is not wired
properly or is disconnected.
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