Follower communication

What does 59 mean?

Communication has been lost between the Master and Follower drives via the SystemBus or CAN communication link. This could be due to incorrect option board parameters or a damaged/disconnected communication cable (optical fibre or CAN). Loss of communication prevents synchronized operation in a master-follower system, leading to operational halts.

• Physical disconnection or damage to the SystemBus/CAN communication cable between master and follower drives.
• Incorrect termination resistors (e.g., 120 Ohm) on the CAN network, leading to signal reflection.
• Faulty or incorrectly installed communication option board (e.g., MCB-103) in the master or follower drive.
• Master drive communication parameters (e.g., P8-10, P8-11) or follower drive address (P8-01) mismatched.
• EMI interference or ground loops affecting communication cable integrity.

Click steps to track your progress.

1. 1

   Inspect SystemBus/CAN communication cable for physical damage, proper seating, and correct pinout between master and follower units.

2. 2

   Measure resistance across the CAN_H and CAN_L terminals at each end of the bus (should be approx. 60 Ohms if correctly terminated).

3. 3

   Verify communication option board (e.g., MCB-103, MCA-101) is securely installed and recognized by the drive (check P8-XX status).

4. 4

   Confirm master drive communication parameters (e.g., P8-10, P8-11 for baud rate) and follower addresses (P8-01) are identical across all connected drives.

5. 5

   Check for proper shielding and grounding of the communication cable to mitigate electromagnetic interference.

6. 6

   Swap communication cable with a known good one to rule out cable fault.