Fagor alarm E307: Power bus voltage too low (software)
DDS drive display code (seven-segment; PS/XPS/RPS power supplies) · Fagor PS/XPS/RPS
What it means
Bus voltage stayed below the permissible minimum, with rated mains under 380 V AC being the documented trigger. High-impedance or weak supply lines sag when the application draws sharp current peaks. Disconnect, verify line condition/tightness of bus plates and mains voltage balance.
Likely causes
- mains supply below 380 V AC or single-phase sagging episodes
- long/small-gauge feed cables with high impedance
- loose bus-bar fastening between modules
- one mains phase weak or contactor pole burnt
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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Mains input contactor/terminal upgrade per installer
component · Check if others ruled out
Need the part urgently?
Send us alarm E307 with your machine details — typical RFQ turnaround is 24–48h.