Alpha Technologies XM2-300CE-HP - Manual (Page 13)

1.0 Introduction to the XM2-300HP, continued
1.1 Theory of Operation
The modular XM2-300HP is composed of the:
Chassis, which contains a transformer and transfer isolation relay. •
Inverter module, which is required for standby operations and contains circuitry needed •
for the three-stage temperature-compensated battery charger, DC to AC converter
(inverter), AC line detectors and Smart Display.
Optional communications module (DPM), used to provide external status monitoring and
•
communications.
1.1.1 AC (Line) Operation
During AC Line operation, utility power is routed into the primary winding of the
transformer through the contacts of the line isolation relay and voltage selection
relays. Simultaneously, in the inverter, power is directed to the rectifier circuitry
providing power for the control circuitry. The bidirectional inverter also serves as
a battery charger during line operation. The transformer and automatic tap relays
provide output voltage regulation.
Fig. 1-1, XM2-300HP
13 017-877-B1-001 Rev. A