MPS Doc: M359_USER_MANUAL REV G January 17, 2010 Page 5 of 30
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The Battery Charger is a voltage-regulated and current-limited DC to DC converter. It
is powered from the 270VDC output of the AC-to-DC LID Converter and provides
temperature-compensated float charge to the Battery Pack. This charging method
preserves the batteries and provides the longest batteries-life possible.
The DC-to-AC Inverter generates clean sine-shape 115VAC voltage from the
270VDC output of the AC-to-DC LID Converter. The DC-to-AC Inverter is current-
limited and overload protected. The M359 provides failure isolation between the
load on its output, to the Prime source that feeds the M359. Overloading the UPS
output will not result in an overload on the prime AC source that feeds the M359.
When the UPS is in the By-pass mode, all of its active circuits (including Overload
Protection) are by-passed or disabled. Therefore, overload protection in the By-pass
mode should be provided by the external 32 to 46 Amp circuit breaker (or fuses) at
the AC outlet that feeds the M359 input.
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The Control Circuit is a microcontroller-based circuit that provides monitoring of the
unit’s status (battery charge, load level, input and output levels, etc.) and supports the
communication and front panel status indicators.
Figure 1, on next page, shows the main functional blocks of the M359. The relays in
Figure 1 are shown in their unenergized state. For simplicity sake, only one pole is
shown for each relay. However, each is a two-pole device that disconnects both of
the AC lines.
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