Alpha Technologies XM2, XM2-HV, XM2-HP - Manual (Page 14)

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 Intelligent CableUPS 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 20 to 40
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.
1.0 Introduction
The Intelligent CableUPS contains an impressive list of features, including:
• Smart Display
• Built-in self test
• Battery test
• An optional factory-installed Protective Interface Module (PIM)
Also available is the High Performance Intelligent CableUPS which features:
• A high efficiency transformer
• Improved Status menus
• Communications menu with DOCSIS
® parameters
• An optional factory-installed Protective Interface Module (PIM)
Via the Smart Display, the operator can view all of the power supply’s operating parameters.
Automatic scrolling (AUTO-SCROLL) is always active so there is no need to press any buttons to
view the power supply’s status or system parameters. In place of operating parameters, active alarms
automatically indicate in the Smart Display so the operator can immediately see what fault is being
detected. Troubleshooting tips automatically display in the Alarm menu screen.
Built-in metering circuits measure voltage and current, without the need for external test equipment.
In legacy models (manufactured prior to July 2006) front panel test points provide access for manual
measurements if desired.
The factory-installed Protective Interface Module (PIM) option allows the Intelligent CableUPS to
function in an N+1 redundant supply system and also provides 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:
To minimize the possibility of the transformer becoming unstable, a minimum load of at least
1A is required to be connected to the output (for the XM2-906G6 and XM2-906HP, minimum
load is 0.5A). Unstable transformers will self-correct as soon as a load of 1A or greater is
connected to the power supply. DO NOT operate unloaded.
CAUTION!
14 017-805-B0-010 Rev. K2