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M
Molly BrownAug 20, 2025
What to do if the Advanced Energy Thyro-PX 2PX has no LEDs lit?
- MMaria RyanAug 20, 2025
If no LEDs are lit on the Advanced Energy Controller, it could be due to several reasons: * The customer-supplied power supply for the A70 control device might be missing. Verify that the voltage at terminal X1.1 and X1.2 of the A70 control device is within the range of 90 VAC to 265 VAC, or that X3.1 and X3.2 are at 24 VDC. * Check that fuses F2 and F3 on the A1, A3, and A5 controller cards are not open. * Also, ensure that the semiconductor load fuses are not open. * For transformer loads, the phase angle of the first half-wave might need optimization. Start with a phase angle (phase angle 1) = 60 degrees and slowly increase it until the inrush current is minimized.
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