Alpha Technologies USM2 - Manual (Page 6)

6
©2000 ™
704-587-B0-003 Rev.D
1.1 USM2 Introduction
This Operator’s and Technical Manual will cover the installation, signal definition, operation, and basic troubleshooting
for the USM2 (Universal Status Monitor) when used with the popular Alpha XM2 Series 2 Power Supply. This manual also
contains detailed information necessary for the successful implementation of the USM2.
The USM2 card is a logic controller PCB which may be used to upgrade any XM2 Series 2 Power Supply for the purpose
of remote status monitoring. As part of the Communications Module upgrade, the USM2 connects directly to the XM2’s
Inverter Module via an 18 pin jumper. No recalibration of the power supply is required at the time of installation.
System Concept
The USM2 remote status monitoring system is comprised of the following basic building blocks:
•
An Alpha XM2 Series 2 Uninterruptible Power Supply.
• A CATV status monitoring system from an approved vendor.
• The USM2 status monitoring card.
Operating under the same status monitoring program as the amplifier system, the operator may issue commands
intended to control the operating mode of the power supply, evaluate potential fault conditions reported by the software, or
run routine checks on the power supply.
For example, the operator may issue a command that initiates a “Self-Test” mode to check the inverter circuitry, status
of the batteries, or obtain values for battery voltages. This kind of information allows for a more accurate assessment of the
operating condition, and ability to supply satisfactory uninterrupted performance of each power supply. More importantly,
proper USM2 operations allow for preventive maintenance on an “as required” basis. This has obvious advantages over a
scheduled maintenance program, since service personnel can be dispatched when required with the appropriate parts and
tools.
1.2 Identification of ‘Old’ Vs. ‘New’ USM2s
With the release and implementation of XM2 products in the 20A and 22A range, a change in the USM2 method of
configuration was required. This change affected the function of specific switch settings on the USM2 related to output
current scaling (SW1-3 and SW1-4).
It is unfortunate that the USM2 could not maintain consistent configuration switch settings from assembly version to
assembly version while still accommodating the 20A/22A XM2, however, this was not possible.
For USM2s manufactured after April 1999:
Configure per this manual:
•
USM2; Operators and Technical Manual (p/n 704-587-B0-001, Revised 1/99 or later)
For USM2s manufactured before April 1999:
Configure per the documentation shipped with the unit or:
•
XM2; Technical Manual (p/n 017-805-B0-001, Revision 5/98)
• Configuration Information is also provided in this manual.
Important Note Related to ‘OLD’ USM2’s When Used with XM2 Power Supplies:
Older (pre-April ’99) versions of USM2 may only be used (if configured with the proper documentation) on XM2 power
supplies configured for less than 20A maximum output current. ONLY new USM2’s are compatible with XM2 power supplies
configured for greater than 20A maximum output current.
1. Introduction