The Digital Controller
ESIE07-05
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Part 2 – Functional Description
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1.2
General Description
Introduction
The Microtech II C Plus control panel contains a microprocessor based controller which provides all
monitoring and control functions required for the safe, efficient operation of the Chiller. The operator
can monitor all operating conditions by using the panel's built in 4 line by 20 character keypad/display
or by using an IBM compatible computer running MicroPlant monitor software release 2.0 and later. In
addition to providing all normal operating controls, the MicroTech II CV Plus controller monitors all
safety devices on the unit and will take corrective action if the chiller is operating of it's normal design
conditions. If a fault condition develops, the controller will shut the system 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 which only allows access by authorized personnel. A
password must be entered into the panel keypad by the operator before any configuration may be
altered
Lan layout
The illustration below shows the Lan layout.
DISPLAY
pLan
MASTER BOARD
COMPRESSOR #1
SLAVE BOARD
COMPRESSOR #2
SLAVE BOARD
COMPRESSOR #3
SLAVE BOARD
COMPRESSOR #4
DRIVER
EEXV #1
DRIVER
EEXV #2
DRIVER
EEXV #3
DRIVER
EEXV #4
ESIE07-05.book Page 4 Friday, December 21, 2007 3:21 PM
