AL.186 CAN Bus off Error – Delta servo troubleshooting

<= See All alarms of Delta servo

Name Description ALM WRN SRV ON Clear


CAN Bus off

CAN data transmission error     Yes

NMT:Reset node/

0x6040.Fault Reset

Causes Checking Method Actions
CAN Bus transfer error Check if the communication is correctly connected or if there is any interference Change the communication cable or clear the noise
  The number of slave station is excessive and the communication cycle period is too short Lengthen the communication cycle period

(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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