A906_O: AC Input Overvoltage
On the VSODC, this fault would be displayed on the seven-segment LED as a number 28.
The Drive LED's will be flashing the yellow LED 10 times.
This fault indicates that the incoming power exceeds the maximum allowable voltage. Check incoming voltage at the lower left corner of the drive where the black and yellow wires are connected. According to the drive supplier, the voltage read at the drive would have to exceed 275 volts for at least 12 seconds to set the alarm. The voltage would have to drop to below 253 volts to send a reset signal. It is possible the drive reads a slightly different voltage than your meter due to calibration or tolerances. VSODU firmware version 62 or later [ A models ] and VSODU Firmware version -02 or later [ B models ] models will reset the voltage at 265 volts.
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 greater than 253 VAC, contact the local utility and have them reduce the voltage to the home.
