Alpha Technologies AlphaNet Series External DOCSIS - Manual (Page 14)

14 745-838-B2-001 Rev. A
3.0 Installation Instructions for Specifi c Power Supplies
These are specifi c installation instructions for standby power supplies supported by the XP-EDH-A2
transponder. Each set of instructions include the interface card settings, a system diagram, and the
output voltage calibration needed to successfully operate.
NOTE:
All settings and instructions specifi ed here supercede information found in previous manuals.
3.1 Alpha XM2 Series
ATTENTION:
Alpha's XM2 power supply installations using USM2 (both new and old versions) and USM2.5 cards require
switch/jumper settings to be made for proper operation.
1. Determine the characteristics of the power supply, such as the inverter voltage (36V or
48V), and the maximum capable output current (typically <20A or >20A).
2. If commercial power is present at the site and the power supply is currently being
powered by commercial AC line voltage, turn the battery breaker OFF on the inverter
module.
NOTE:
When monitoring commercial line power, the XM2 (with the USM2.5 card) does not require an input voltage
transformer because the USM2.5 card provides a scaled voltage representing the line input to the power
supply. In this situation, the transponder makes the measurement via the interface cable connected to the
USM2.5 card.
3. Slide the inverter drawer out to gain access to the switches or jumpers located on the
various types of USM2 and USM2.5 cards. If you need to install a USMx card, refer to
the manual supplied with the card and complete the installation process.
4. Refer to the following diagram and adjust the switch settings to match your power
supply.
5. Re-insert the inverter module and tighten the retaining screws.
NOTE:
Turning the battery breaker OFF disables standby power.
NOTE:
The EDH-A2 supports AC Scaling for Output Voltage measurements as opposed to DC scaling for the EDH-A.
As a result the USM2/USM2.5 switch settings are different and calibration is no longer necessary. Refer to
the EDH-A Installation Manual for EDH-A installation procedures.