A929_O: 240V Missing or Comm Failure
On the VSODC, this fault would be displayed on the seven-segment LED as a number 16. A 16 displayed is one of several inverter faults. You will need to validate this fault at the EcoNet Thermostat or by looking at the red or yellow flashing LED's in the upper right quadrant of the drive itself
The Drive LED's will be either completely void of any lit LED's or flashing the Red LED 11 times.
When you get this fault, or see it in the history it means the VSODC cannot communicate with the drive. First and foremost, check for line voltage at the bottom left corner of the drive board from Black to Yellow (L1-L2). This often means nothing more than there is no legitimate power to the drive itself. Make sure the breaker is on, the disconnect is in correctly, and power is present at both legs. Measuring voltage to the drive is done by reading AC voltage at Black to Yellow. Do not read voltage from either leg to ground as this is not a proper voltage measurement. The voltage going into the drive must be between 187 Volts AC and 253 Volts AC.
If there is indeed proper voltage measured with a meter to the drive AND drive LED's are lit, make sure the grey mod-bus cable from the VSODC to the drive itself is firmly connected. Pay special attention to the connection at the VSODU and ensure none of the wires or pins have pulled out the back of the connector.
