Alpha APP60S Manuel de l'opérateur télécharger pdf (Page 7)

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The APP60S Service Power Supply is a portable device used to provide temporary power for

Alpha AP Series standby power supplies and XP Series uninterruptible power supplies while

they are being serviced. The APP60S can be used in either pole or ground-mount enclosures

to provide signal processing equipment in Cable Television and Broadband LAN distribution

systems with current-limited, regulated AC power.

The APP60S Service Power Supply contains a front panel ammeter to measure the output

current to the load; an output fuse to protect against excessive short circuit currents; a

"LINE" indicator to verify AC input power from the utility; an input fuse to provide additional

voltage protection; and a 30/60 VAC switch for output voltage selection (48/60 for 50 Hz

units).

UL Listed and CSA Approved, the APP60S Service Power Supply is designed to be rugged,

reliable and versatile. Alpha Technologies, recognized as an international market leader in

the field of backup power, offers complete technical support and prompt, reliable service

to ensure that your power supply continues to provide years of trouble-free operation.

1.2 Theory of Operation

The APP60S Service Power Supply contains a ferroresonant transformer and a resonant

capacitor. During AC LINE operation, utility power is fed into the primary winding of the

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

ferroresonant transformer which provides excellent noise and spike attenuation, short

circuit current limiting, and output voltage regulation. Note: The ferroresonant transformer

produces a "quasi" square wave output which resembles a rounded square wave.

During LINE operation, AC power enters the APP60S where it is regulated (at the required

output voltage) and passed onto the load via the SPI (Service Power Inserter) located inside

the power supply enclosure. A switch, located on the SPI, toggles output power from the

power supply requiring service to the APP60S.

IMPORTANT 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 ACCU

RATE READING WHEN MEASURING A "QUASI"

SQUARE WAVE OUTPUT.

1. INTRODUCTION

1.1 THE APP60S SERVICE POWER SUPPLY

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Alpha APP60S Manuel de l'opérateur Page 7