Problem Description:

Drill rod limit switch failed.

Troubleshooting Steps:
– Height limit fault detected. Checked height limiter wire 503; had 24V. Measured wire 511 while holding the limit switch; had power. Still faulty. Checked power supply to the controller; found an open circuit at the upper mast connector.

Root Cause:

No specific record.

Required Parts:

Reconnected the circuit; fault repaired.