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


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

Product Line:
ATV212, ATV21

Environment:
All Models and serial numbers.

Cause:
To be determined

Resolution:
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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