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ATV31 and ATV312 has a blank display or the drive will not power up.
Altivar ATV31 ATV312
The digital display is blank or the drive will not power up.
Check the line voltage on L1 L2 L3 see if the input voltages are balanced.
Checked the DC bus on PA+ and PC- or + - terminals. 480VAC line voltage will give you a 680VDC bus, 230VAC Line voltage will give you a 330 VDC bus.
Check the +24vdc to com and the +10vdc to com.
Remove any or all control wires from the terminals of the drive then power up.
There are no repair parts for the ATV31 or ATV312 drives so if the drive is inop you will have to replace it.