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Q : How to troubleshoot a VFD keypad screen that flickers or fails to display?
A: The VFD keypad receives its 24V power supply from the switching power supply section of the drive board. You can check if the power supply is functioning properly by measuring the 24V and GND connections on the control board. If the 24V power supply is normal, replace the keypad or control board for testing, as the keypad may be damaged or the keypad cable may be loose. If the 24V supply is unstable, replace the switching power supply section. Please consult INVT professionals.
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