LG RCWW Operation & Maintenance Manual page 24

4. CONTROL SYSTEM
24
Features of control unit
The Control unit of LG chiller controls temperature, pressure, flow rate, current, voltage, power and capacity control
valve using high capacity microprocessor. It is constructed to provide the high reliability chiller operation using LG's
unique optimum control algorithm.
Our controller unit has the following features.
1. 7 inch Color wide LCD Display (800*480 Graphic)
2. Remote operation/stop function which allows the chiller to be operated remotely.
3. Scheduled operaton function which allows setting the operation time period in holiday and weekdays.
4. Soft loading function for the low load startup
5. Various preventive control function for preventing overload, condenser high pressure, evaporator low pressure,
surge, etc.
6. Advanced control function for the optimum control
7. Improved control function to protect the chiller
8. Self diagnosis function for easy checking of abnormal situation
9. Help function describing actions to take when problem occurs
10 Operation data and operaton status(error and control action) saving function
11. Automatic sensor setting function to set the sensors automatically(set by software)
12. Automatic repeat key function for setting values easily
13. Modbus protocol communication function for remote surveillance control
- RS485: Standard installation
- BACnet & RS232C: Optional
14. Graphictrend function showing the chilled water outlet temperature and operation current change in real time.
15. Print function for printing operation or problem data(Optional)
16. Cooling tower fan control function for keeping stable cooling water temperature
17. Interlock check function for checking peripherals and malfunction
18. Time display function showing number of operations and total run time of the pump and motor which are at-
tached to main body.