Alpha Technologies USM2 - Manual (Page 7)

7
©2000 ™
704-587-B0-003 Rev.D
1. Introduction
1.2 Identification of ‘Old’ Vs. ‘New’ USM2s, continued
The “new” USM2 may be easily be identified by the board markings. All new USM2s will have the p/n “704-587-70-00x”
with their configuration marked in hand on the PCBA. e.g. “USM2-22”. This marking will be found on a yellow ‘square’ along
the bottom right edge of the board.
The “old” USM2s will have NO configuration markings on this yellow square and will have a p/n other than 704-587-70-
00x (e.g. 704-587-29-00x, 704-587-20-00x, etc.).
Using the correct documentation associated to the USM2 board when setting switches and jumpers will avoid configuration
issues related to output current settings.
Overview Of Switch Settings:
In order to represent the proper, 0.4V/AAC Output Current:
•
New USM2’s in XM2 with 15A or less output must have SW1-3 and SW1-4 placed in the “OFF” position
• New USM2’s in XM2 with 20A or 22A output must have SW1-3 & SW1-4 placed in the “ON” position.
• Generally speaking, “old” USM2’s installed in XM2 with 15A or less output should have SW1-3 & SW1-4
placed in the “ON” position.
Figure 1-1; “New” USM2 Identification
Notice how the USM2 is marking in this
picture of a “new” USM2.
1)
The Part Number contains “-70-”
is in this position.
2) Bears a configuration label.
Figure 1-2; “Old” USM2 Identification
Notice how the USM2 is marking in this
picture of an “old” USM2.
1)
The Part Number does not
contains “-70-” in this position.
2) Has no configuration label.