OM AGSB-5 5
General Description
General Description
The AGS MicroTech ΙΙ distributed control system consists of multiple microprocessor-
based controllers that provide monitoring and control functions required for the controlled,
efficient operation of the chiller. The system consists of the following components:
• Unit Controller
, one per chiller − controls functions and settings that apply to the unit
and communicates with all other controllers. It is located in the control panel for circuit
#1 and is labeled “UNIT CONTROL”.
• Circuit Controller
for each compressor/circuit (two or three depending on model size)
that control compressor functions and settings specific to the circuit. The controllers are
located in their circuit's control panel that is mounted between the condenser coil
sections and are labeled “CIRCUIT CONROL”.
In addition to providing all normal operating controls, the MicroTech II control system
monitors equipment protection devices on the unit and will take corrective action if the
chiller is operating outside of its normal design envelope. If an alarm condition develops,
the controller will shut the compressor down and activate an alarm output. Important
operating conditions at the time an alarm condition occurs are retained in the controller’s
memory to aid in troubleshooting and fault analysis.
The system is protected by a password scheme that allows access only by authorized
personnel. The operator must enter the operator password into the controller's keypad
before any setpoints can be altered.
Control Architecture
Figure 1, Major Control Components
Chiller A
Unit
Controller
Circuit #1
Controller
4x20 LCD
Solid
State
Starter
pLAN
BACnet MS/TP
BACnet IP
BACnet Ethernet
LonTalk
RS485/LON/Ethernet
RS485
(future)
4x20 LCD
(future)
EXV
Other Circuit
Controllers
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