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The SCR power controller does not deliver any output. What should I check? Jul 24
  1. Verify that the mains voltage is present on all phases.
  2. Check the semiconductor fuse(s) – an open fuse will block output.
  3. Confirm the setpoint signal (4–20 mA or voltage) is present and within range.
  4. Check that the Enable / Run input is active (usually a dry contact closure).
  5. Look for any alarm states (over-temperature, phase loss) that might inhibit firing.
  6. Ensure the correct firing mode is selected (e.g., zero-cross for resistive, phase-angle for transformer loads).

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