OM 200MICRO 11
Analog Output Board (AOX)
The AOX board converts control instructions from the Microprocessor Control Board’s expansion
bus into an analog control signal suitable for driving a cooling tower bypass valve. Each AOX board
is factory set via jumper to provide an output signal range of 0 - 10 VDC. An additional output on the
AOX board provides an analog signal that is proportional to compressor motor current.
Figure 7, AOX Board
Analog Outputs (Optional)
The analog outputs available at the AOX board provide a variable voltage used to control field
mounted devices. The range of the output signal is jumper selectable: 0-10 VDC (default); 0-5 VDC; 4-
20 mA.
Table 4, AOX Board #1
No. Description Conversion
0 Cooling Tower Bypass Valve 0-255 : 0-100% Open
1 Proportional Motor Current Output 0-255 : 0-100% RLA
2 *Compressor Variable Frequency Drive 0-255 : 0-100% Open
3 *Cooling Tower Variable Frequency Drive 0-255 : 0-100%
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