Fault codes covered
14-94
Low line voltage may result in increased electronic component temperatures and shorten the life of VFD. Since control voltage is based on line voltage, solenoids and relays may not pull in and hold correctly as well. “Line Voltage Low” fault is set when incoming line voltage drops below 180V AC RMS at any time, or when line voltage drops below 185V AC RMS for more than 5 seconds. Once line voltage increases above 187V, the fault will clear. While fault is active unit will not operate or will shut down if already running. This fault does not escalate to a malfunction.
On 26VNA/27VNA models, this measurement is taken at the secondary side of the 24VAC transformer and a scaler value applied at the factory to correct for transformer variation. On 27VPA models the VFD measures the line voltage directly.
Technician should first measure incoming line voltage at terminal block. Second, check tightness of all line voltage connections. Loose connections can cause excessive voltage drop and trigger this fault. If all connections are tight and line voltage is still low, additional steps involving the local power utility or addition of external power conditioner may be required.
Source: ACHPVSR454-02SM troubleshooting pages.