20 PFS 155C - 315C OM 135
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 5, AOX board
Signal Converter Board
The AC current signal generated by the starter is converted by the signal converter board into a 0-5
VDC signal that is directly proportional to the chiller amp draw. The amp draw signal is sent to the
ADI board for conditioning and then to the M280 controller.
Figure 6, Signal converter board
TB1 TB2
To Next Page
Loading...
Need help?
General
