Alpha Technologies USM2 - Manual (Page 15)

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704-587-B0-003 Rev.D
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3. Configuration
3.1 USM2 Configuration, continued
Always verify USM2 configuration especially after upgrading or modifying the XM2 Series 2 Power Supply.
Function Switch SW1 Reference
The following information describes each switch position (1–8) for the DIP switch SW1. SW1 is an eight switch
component used primarily to select analog scaling and digital signal polarity for the USM2 card.
SW1 (1 and 2): Inverter Battery Voltage Scaling Select
SW1, positions 1 and 2 are used together to select the appropriate scaling for the XM2 Series 2 battery
voltage measurement.
SW1 (1) SW1 (2) Battery Scaling
OFF
OFF 0.1VDC/VDC
OFF ON 0.3VDC/VDC
ON OFF 0.3VDC/VDC Same as previous setting.
ON ON 0.5VDC/VDC
SW1 (3): Output Current Scaling
SW1, position 3 is used to select the appropriate scaling for the XM2 Series 2 AC OUTPUT CURRENT#1.
SW1 (3) Output Current #1
OFF
0.4VDC/AAC for Output Current less than 20A.
ON 0.4VDC/AAC for Output Current equal to or greater than 20A.
The switch settings for the Output Current Scaling are for “new” USM2, see Note following SW1 (4) on the next page.
Figure 3-1; USM2 Jumper and Switch Locations