Liebert Hipulse D Ups Manual Fix Jun 2026

The Hipulse D has a back-to-back thyristor (SCR) pair in the static bypass line. Over time, snubber circuits (resistor-capacitor networks) across these SCRs dry out, causing false detection of a short even when the SCR is healthy.

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Working on three-phase UPS systems carries risk of arc flash and electrocution. Always follow NFPA 70E and local regulations. The author is not responsible for misuse of these manual-based procedures. The Hipulse D has a back-to-back thyristor (SCR)