MD-1000I / MD-2000I / MD-3000I Trouble Shooting Guide
8. Trouble Shooting Guide
Only authorised qualified service personnel are to perform repairs or cor-
rective actions to remedy UPS system malfunctions.
Situation Description Audible Signal Description
UPS malfunction, serious
problem
Long continuous audible signal
UPS malfunction, power still
provided via inverter or bypass
Single continuous audible signal with ~2-
second interval
Battery mode Single short audible signal with ~1-
second interval
Battery low Very fast and short continuous signal
Verify/RS-232 connection 2 short, fast audible signal tones
Service mode ok 1 faster and shorter audible signal tone
UPS starts first with self-test 2 continuous fast and short audible
signal tones repeating in ~2-second
intervals.
MD Series 77
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