Yaskawa MP920 Motion Module - Manual (Page 374)

8 Troubleshooting
8.2.1 Alarm IL††22
8-18
„ Broken PG Wiring
SVA-01A SVA-02A SVB-01 PO-01
Supported Supported Not supported Not supported
Detection Timing
• Enabled only in Position Control Mode, Phase Control Mode, and Zero Point Return Mode with
the pulse count system selected (A/B mode). The PG broken wire detection signal is monitored
in scan cycles through software.
Note: The PG broken wire detection signal is detected by a hardware circuit.
Alarm Processing
• Stop
• Position loop processing will be stopped and the machine will decelerate to a stop using the
open loop speed reference.
• The servo OFF command will be executed after decelerating to a stop.
• Create a user application that will set acceleration/deceleration time to 0 when a broken PG wire
is detected if you want to stop immediately rather than decelerating to a stop.
Errors and Causes
• Improper or disconnected encoder wiring.
• Encoder or SERVOPACK failure.
• SVA Module failure.
Action Taken
• Check the encoder wiring.
• Contact Maintenance.