GE 400 User Manual

Also see for 400 Series: Maintenance manual User manual Instruction Instructions Instructions

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GE 400 User Manual Manual pdf 15 page image

Modifications reserved Page 15/79OPM_SGS_USM_M40_M50_2US_V010.doc User Manual SG Series 400 & 500 UL S24.2.5 Automatic BypassIn normal operation, the Load is supplied by theInverter.When the control system detects a fault in theInverter, an overload condition or a short-circuitcondition, the Automatic Bypass will transfer thecritical Load to the Utility without interruption.When the Inverter recovers, or the overload orshort-circuit condition is corrected, the Load willbe automatically transferred back to the Inverter.If the UPS is unable to return to normal modefollowing an automatic transfer to Bypass mode,an alarm condition will be initiated.A Manual Bypass (operator initiated) will not beconsidered as an alarm condition.Fig. 4.2.5-1 Block diagram Automatic BypassIn case of parallel operationEach unit has its own internal Bypass.These units are continuously exchanging information, enabling all of the internal Bypass circuits in aparallel system to operate simultaneously.If the Inverter of a unit fails, its Bypass circuit remains available to the Parallel System.It is excluded only if the unit is separated from the common bus by opening its output switch Q1.4.2.6 Manual Bypass (option)The Manual Bypass circuit consists of Q1 and Q2manual switches, which permits transfer of theLoad directly to the unconditioned AC powerwithout interruption, leaving the UPS available formaintenance.Fig. 4.2.6-1 Block diagram Manual Bypass