Serial Communication Transmission Error
Yaskawa · J1000 AC Drive
What does CALL mean?
This minor fault indicates that serial communication has not been established between the drive and the master, or that communication was interrupted. It is often caused by faulty wiring, incorrect termination resistor settings, or programming errors on the master side. If left unresolved, the drive will not be able to receive commands or send status updates, leading to system operational failure.
Complete Troubleshooting Guide
- 1
Check all communication wiring for errors, disconnections, or short circuits and correct as necessary.
- 2
Verify the termination resistor settings; ensure resistors are installed at both ends of the communication line and slave drives have their internal termination resistor DIP switch S2 set to ON.
- 3
Review the master-side programming for communication errors, especially during start-up, and make necessary corrections.
- 4
Perform a self-diagnostics check on the drive; if the problem persists, the control board or entire drive may need replacement.