Volume 8 – Mechanical and Electrical Services - Malaysia Geoportal

Chapter 10 SCADA AND AUTOMATION SYSTEM
The system shall build in 2 control profiles for installed system namely Irrigation mode and Drainage
mode. In drainage mode, the system will drain out the water automatically as the tide low, and close
the gate as the tide going high. In irrigation mode, the system will reserve the water at setting level
for irrigation level and drain out the water as the level achieve the setting level during tide low. The
system shall close the gate as the tide up or the water level achieves irrigation low level.
These two modes of control operation are totally contrary to one another. If one sets the control to
irrigation mode, the control system keeps the water. But if one sets the control to drainage mode,
the control will flushes the water instead. A good Watergate system must able to handle both of
these controls in the same system. Thus, the consultant team proposed that the system should build
in both of these two modes for users convenient. Users only need to change the setting on the
control panel and the system will start to perform that particular mode of control without any
modification or changes in the system. This is what so call user friendly Watergate control system.
10.5.2 Automatic Control mode
The system shall be able to detect the high tide and low tide and prevent the sea water to flow into
river. However, the system shall intelligent enough to open the gate as upstream level is higher than
downstream during high tide and at the same time prevent the sea water to flow into the river.
Control algorithm of automatic control shall be intelligent enough to make accurate decision on gate
control. Gate shall not open and close too frequent to avoid actuator from burn out. The system shall
be intelligent enough to take accurate tide level and not affected by any interference like boat’s
wave.
10.5.3 Remote Control and Remote Monitoring Mode
The system shall able to provide remote control mode with password protected. Users shall be able
to login to system remotely at any moment and any location using any notebook or any PC without
any special software to do remote monitoring and remote control as long as users have username
and password to do so. (For remote control, multi layer password shall be applied for security
purposes). User shall be allowed to access remote control mode from MMI through web server OR
directly from RTU web SCADA.
10.5.4 Manual Push Button Control Mode
The system shall provide manual control mode where users can only control the gate at site by
pressing open or close button at the panel. Manual control mode shall have higher priority than auto
and remote control for security purposes especially during maintenance.
10.5.5 Local Control Mode
The system shall provide local control at actuator and local gear box. There are two local control
modes available for the system includes:
a) Local actuator control mode whereby operator may lift up the gate by select the
actuator to actuator local control mode at actuator and push on open button to open
and close button to close the gate. Operator may also push on stop button to stop
the operation of the actuator.
b) Local Manual Control mode whereby operator may open or close the gate by turn on
manually on the handwheel provided at actuator or gear box.
10-16 March 2009