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Troubleshooting Guide

Power Is On but the Crane Won’t Move — Electrical Fault Causes and Solutions

Causes and solutions for the "power is on but the crane won’t move" problem. Kale Vinç Sistemleri 24/7 electrical fault service.

Power On but Crane Not Moving — Kale Vinç Sistemleri

The complaint "the crane has power but won’t move" is one of the most common fault scenarios in industrial cranes. The possible causes should be examined systematically before it leads to a production stoppage.

Possible Causes and Diagnosis

  • Contactor failure: Motion contactors (forward-reverse, up-down) may jam mechanically or electrically. The contactor coil may carry 230V AC while the contact points are burnt. If the signal LED is lit and the contacts are not clean, the contactor is replaced.
  • Limit switch fault: If a limit switch stays permanently triggered, that direction of motion is blocked. In particular, a failed hoist-up limit switch stops the lifting motion entirely.
  • Thermal relay trip (motor overheating): Overheating of the motor winding trips the thermal relay. The relay usually resets itself after a few minutes, but the root cause (overload, poor ventilation, winding fault) must be investigated.
  • Phase loss: Loss of one phase in the three-phase supply prevents the motor from running. A phase-monitoring relay can prevent this issue.
  • Control transformer or fuse: The control circuit is fed by 24V or 110V AC. A blown fuse in this circuit stops all motion and the control panel (joystick/buttons) becomes unresponsive.
  • Encoder / frequency inverter fault: In variable-frequency drive (VFD) systems an encoder error code or an inverter fault can block all motion. The error code should be recorded and reported to the service team.

Electrical Fault Response Procedure

  1. 1Apply safe isolation (LOTO); if no load is suspended, shut the system down.
  2. 2Record any error code or warning light on the control panel.
  3. 3Try resetting the thermal relay; if it trips again, have the motor checked.
  4. 4Test the limit switches manually.
  5. 5Check the contactors, fuses and control transformer.
  6. 6If the problem persists, call the Kale Vinç Sistemleri 24/7 service line: +90 532 376 69 12

Unauthorised intervention in electrical faults can cause fire, equipment damage or injury. Always assign a certified electrical technician.

Frequently Asked Questions

If the crane has power but no motion works, what should be checked first?

First check the control-circuit fuse and control transformer; when this circuit fails the joystick and buttons become completely unresponsive. Then inspect for phase loss and the emergency-stop loop.

What if the thermal relay keeps tripping?

Repeated thermal trips indicate a root cause: overload, poor ventilation or a motor winding fault. Instead of resetting the relay repeatedly, measure the motor current and test the winding insulation.