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Fault diagnosis

Answer a few questions to narrow down the cause. The steps follow the order technicians actually use: rule things out from the outside in, from cheap to expensive.

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What to do

Suspect unstable power

  1. Check whether it coincides with motors or welders starting up
  2. Measure the voltage while the machine is under load, looking for sag
  3. Re-check the terminal block screws — slightly loose ones lose contact under vibration
  4. Consider a larger PSU or adding a DC UPS

Need someone to take a direct look?

Describe the symptoms and what you have tried — an engineer will call back to help.

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Symptom: Suspect unstable power

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Before opening the machine. Disconnect power, wait for capacitors to discharge, and photograph the current wiring. If the machine is under warranty, call us first — opening it yourself may void the warranty.