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What can cause the screen to be blank when power is applied to the ATV212?

The screen remains blank even though voltage has been applied to the line supply terminals.

Product Line:
ATV212, ATV21

All Models and serial numbers.

To be determined

1.  Verify proper voltages are applied to the line supply terminals L1 L2 L3.
2.  Measure the DC bus.  With the multimeter set on DC put the positive lead on PA+ and the negative lead on PC-.  This value will be approximately the line voltage times the square root of 2.  Example if the line voltage is 480Vac the DC bus voltage should measure approximately 679Vdc (480 * 1.414 = 679vdc).  
3.  If the DC bus is correct check all connections.  Verify the control terminal board is seated properly.   
4.  Remove all wires from the terminal control board and measure terminals PP (+10) and CC (power supply common).  This should measure 10vdc.   
5.  Check your P24 (+24) and CC (power supply common).  This should measure 24vdc.
If any voltages of steps 2, 4, and 5 read 0v then the drive will need to be repaired or replaced.  

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