8
OM 200MICRO
Table 1, Digital Outputs
No.
Description
LED Off
LED On
0
Alarm LED and Contact
Programmable
Programmable
1
Unload Solenoid and Front Panel LED
-
Unload
2
Load Solenoid and Front Panel LED
-
Load
3
Motor Control Relay
Off
On
4
Motor Control Relay Latch
Unlatched
Latched
5
Oil Pump
Off
On
6
Oil Sump Heater
Off
On
7
Oil Cooler close
Off
On
8
Oil Cooler Open
Off
On
9
*Hot Gas Bypass Solenoid
Off
On
10
*Liquid Injection
Off
On
11
Cooling Tower #1
Off
On
12
Cooling Tower #2
Off
On
13
Cooling Tower #3
Off
On
14
Cooling Tower #4
Off
On
15
Evaporator Water Pump #1
Off
On
16
Evaporator Water Pump #2
Off
On
17
Condenser Water Pump #1
Off
On
18
Condenser Water Pump #2
Off
On
19
Spare
20
Spare
21
Spare
22
Spare
23
Spare
Analog/Digital Input Board (ADI)
The ADI Board provides low voltage power for the temperature and pressure sensors. It also
provides optical isolation between the Microprocessor Control Board and all 24V switch inputs.
LED's are furnished on the board to give a visual indication of the status of all digital inputs. All
analog and digital signals from sensors, transducers and switches are received by the ADI Board and
then sent to the Microprocessor Control Board for interpretation.
Figure 6, ADI Board
Analog Inputs
Analog inputs arriving at the ADI board are comprised of temperature, pressure, and flow signals. In
addition, the chiller control panel mA receive chilled water reset and demand limit signals in the range
