1800 Series User Manual
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APPENDIX B: SYSTEM OVERLOAD
The 1800 Series UPS is capable of supporting short duration overloads.
Online Mode:
When operating in the On Line mode if the output load goes above the rated
load, the unit may start beeping indicating output overload. Output overload-
ing of 125% of the rated output current can be supported for 1 minute, and
150% for 30 seconds. If the overload continues and does not drop to the
nominal rated load, the unit will eventually transfer to bypass mode.
Bypass Mode:
If the output load is reduced below the output power rating, the unit will return
to normal. If the unit transfers to bypass due to output overload twice in 10
minutes, the “return to normal” function is disabled and will never return to
online mode until the alarm is reset by cycling (turning off then on) the input cir-
cuit breaker. If the unit is in bypass mode and the output load is not reduced,
the unit will eventually go to shutdown.
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