A907_O: AC Input Undervoltage
On the VSODC, this fault would be displayed on the seven-segment LED as a number 27.
The Drive LED's will be flashing the yellow LED 9 times.
This fault indicates that the incoming power is below the minimum allowable voltage. Check incoming voltage at the lower left corner of the drive where the black and yellow wires are connected.
The proper measurement is from L1 to L2. Measuring either to ground is a waste of time because it does not matter
The voltage between L1 and L2 needs to be between 187 VAC and 253 VAC. In the event the voltage is less than 187 VAC, Check for loose connections between the breaker and disconnect, between the disconnect and incoming power terminal block, to and through the low pass filter. contact the local utility and have them increase the line voltage.
