AL.185 CAN Bus hardware Error – Delta servo troubleshooting

Name Description ALM WRN SRV ON Clear


CAN Bus H/W Error

The communication of CAN Bus is breakdown or Error Rx/Tx Counter is over 128 No NMT:Reset node/

0x6040.Fault Reset

Causes Checking Method Actions
Abnormal CAN Bus hardware
  1. Check if the communication cable of CAN Bus is good.
  2. Check if the communication quality is good. (It is suggested to use common grounding and shielded cable)
NMT: Reset node or re-servo on

(The above information is referenced from Delta Electronics IMSBU)

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Other reasons Checking Method Actions
Bad communication quality ?


  1. Is the original isolation line used?
  2. Is the terminating resistor connected?
  1. It is recommended to use the original shielded communication cable to avoid noise interference!
  2. Connect terminal resistors to improve communication quality
  3. Note: Delta’s CAN and DMCNET’s terminal resistance is different, please choose correctly!

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