Unit installation

13
MICROPROCESSOR CONTROLLER
The microprocessor controller works on a state of art microprocessor technology. This controller monitors analog and
digital inputs to achieve precise control & safety functions of the unit.
The Software works on the Proportional Integral Derivative (PID) algorithm for precise control logic.
The simple to use push button keyboard allows accessing to the operating conditions, control set points & alarm
history that are clearly displayed on a multi-line back illuminated LCD panel.
An easy to install serial port/ modem option allows remote monitoring of the operating parameters. With
corresponding windows software, the system allows data to be viewed in tabular or graphic format as well as interact
with system set up. This chiller controller is compatible with Building Management System (BMS) “BAC NET/
MODBUS” protocols through corresponding optional gateway interfaces.
It is also compatible with GSM protocol through GSM optional gateway that sends up to 3 mobile phones SMS
messages whenever alarm takes place, indicating the type of alarm, the corresponding compressor, the related chiller
and which location.
The microprocessor consists of the following hardware:
1. User Interface Board: Provided with simple to use push button keyboard and menu driven software to access
operating conditions, control set points & alarm history clearly displayed on the LCD panel.
2. Main Board: This control up to two (2) compressor system.
3. Auxiliary Boards: Required for controlling an additional two (2) or more compressors.
4. Remote Monitoring System [Optional]: The micro controller is complete with all hardware and software necessary
to remotely monitor and control the chiller unit.
Display Information:
In the normal operating mode the 20 x 4 characters LCD panel display the system status, the temperature of the water
inlet & outlet, the set point, run time of the compressor & the alarm history.
Easily accessible measurements for each circuit include the following:
• Suction and discharge temperatures
• Suction, discharge and oil pressures
• Water inlet/ outlet temperatures
• Compressor status
• Fan status
• Liquid line solenoid status
• Unit/ Compressor run time
The control temperature is continuously displayed on the 3 Digit 7 segments LED Display. The 3 LED lights indicate
the Power ON, Menu adjustment and Fault.
System protection:
The following system protection is provided to ensure system reliability:
• Compressor winding overheating
• Low suction pressure
• High discharge pressure
• Freeze protection.
• Low oil pressure
• Sensor error
• Time delay – anti recycle time for compressor
• Serial communication error.