Alpha Technologies XM3-HP Series - Technical Manual - Manual (Page 16)

16 017-882-B0-001 Rev. C2 (10/2013)
1.0
Introduction
The Intelligent CableUPS ® powers signal processing equipment in cable television and broadband LAN
distribution systems. The transformer module provides a critical load with current-limited regulated AC power
that is free of spikes, surges, sags and noise.
During AC line operation, AC power entering the Power Supply is converted into a quasi square wave and is
regulated by a ferroresonant transformer at the required output voltage. The regulated voltage is connected
to the load via the output connectors and some power is directed to the battery charger to maintain a float
charge on the batteries.
When the incoming AC line voltage significantly deviates from normal, the Inverter Module automatically
switches to standby operation and maintains power to the load. During the switch to standby operation,
energy in the module’s ferroresonant transformer continues to supply power to the load. In standby mode,
the Power Supply powers the load until the battery voltage reaches a low-battery cutoff point.
When utility power returns, the transformer module waits a short time (approximately 10 to 20 seconds) for the
utility voltage and frequency to stabilize and then initiates a smooth, in phase transfer back to AC line power.
Once the transfer is complete, the battery charger recharges the batteries in preparation for the next event.
The Alpha XM3-HP CableUPS contains the following:
• Smart Display
• Hot-swappable Inverter Module
• Built-in Self Test
• Wide Input voltage range
• High efficiency transformer
• Communications menu with DOCSIS
®
parameters (only with optional DSM3 or IDH4
installed)
• Optional factory-installed AlphaDOC (PIM)
allows the XM3-HP to provide programmable
current limits for two output channels.
The duration of battery-backed standby operation depends upon the type and number of batteries and the load on
the Power Supply.
NOTE:
During a no-load start-up, the Power Supply may reduce output voltage to 75-80% of rated output voltage until a
load of greater than 1.5A is applied.
NOTE:
1.0 Introduction
1.1 Alpha XM3-HP Intelligent CableUPS ®
Fig. 1-1, Alpha XM3-HP Intelligent CableUPS
• Optional Smart AlphaGuard (SAG)
• Optional AlphaAPPs (APPS) card
• Via the Smart Display, the operator can
view all of the Power Supply’s operating
parameters.
• Troubleshooting tips automatically display
in the Alarm menu screen.
• Built-in metering circuits measure voltage
and current, without the need for external
test equipment.