Alpha XM 6015 Series Operations Instructions download pdf (Page 11)

1. INTRODUCTION

1.2 Theory of Operation

The XP Series Uninterruptible Power Supply consists of an XM Series power module,

a pole or ground-mount enclosure, and a set of gelled electrolyte, no maintenance batter-

ies. The power module contains a ferroresonant transformer, resonant capacitor, dual-

mode temperature-compensated battery charger, DC to AC converter (inverter), transfer /

isolation relay, and a main circuit module assembly containing the logic circuit.

1.2.1 AC (LINE) Operation

During AC LINE operation, utility power is routed into the primary winding of

ferroresonant transformer T1 and through the contacts of the transfer / isolation relay K101.

At the same time, power is directed to the auxiliary transformer T101 which provides power

for the control circuitry. A charger / inverter winding on transformer T1 supplies the battery

charger circuit. AC capacitor C1 forms the resonant circuit of ferroresonant transformer T1

which provides excellent noise and spike attenuation, short circuit current limiting, and

output voltage regulation. The ferroresonant transformer produces a "quasi" square wave

output which resembles a rounded square wave.

NOTE: WHEN MEASURING THE OUTPUT VOLTAGE OF FERRORESONANT

TRANSFORMERS, USE ONLY A TRUE RMS AC VOLTMETER. NON-RMS READING

METERS ARE CALIBRATED TO RESPOND TO PURE SINE WAVES AND WILL NOT

PROVIDE AN ACCURATE READING WHEN MEASURING A "QUASI" SQUARE WAVE

OUTPUT.

The XP Series Uninterruptible Power Supply

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Alpha XM 6015 Series Operations Instructions Page 11