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9900D SERIES UPS
1-9
OWNERS / TECHNICAL MANUAL
the Static Transfer Switch line through CB3 (herein after STS contactor CB3) supplies the power
immediately, and then the Internal Bypass line through 52S supplies the power. In the event of a
switching to the Bypass line, the power to the critical load will be uninterrupted. The purpose of this
Internal Bypass line is to route power to the critical load while the UPS module is de-energized
(converter and inverter), and during Start-up before the system is fully operational.
Each UPS internal static bypass line will equally share the power supplied to the critical load in the
Parallel Operation if a cable length of bypass line is equal each other. For a MMS unable to equalize
the cable length, additional rectors should be installed to compensate the difference in cable
impedance.
In the event of a load overcurrent, the UPS transfers to bypass without interruption to the critical
load. In the case of the Parallel Operation, all UPS will transfer to bypass without interruption to the
critical load.
The internal control system determines the operation of the two paths, with the load powered from
the inverter being the normal operation.
MITSUBISHI ELECTRIC 9900D SERIES UPS
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