ABB CRB 15000, Product Manual, Page: 1065 / 1096

7.5 Drive system communication link and DC link are both down during robot running
Description
During robot running, the robot system enters system failure state with 34402 "DC
link voltage too low" and 39351 "The drive system communication link is down"
reported.
Consequence
No operation will be possible until the fault is corrected.
Possible causes
• The system power is derating when the robot system is running with incoming
mains lower than 180 VAC.
• The incoming mains voltage to the rectifier unit is out of specification.
• Cable between manipulator and controller is disconnected.
Recommended actions
1 Run warm-up cycles.
2 Reduce acceleration or speed.
3 Change to 230 VAC incoming mains, or add an external transformer to
upgrade the incoming mains to 230 VAC.
4 Check incoming mains voltage. Change the mains tolerance min so that the
mains voltage is inside the specified interval.
5 Check the cable connection between manipulator and controller.
6 Check for other hardware event log messages regarding connection problem.
Product manual - CRB 15000 1065
3HAC077389-001 Revision: L
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7 Troubleshooting
7.5 Drive system communication link and DC link are both down during robot running