4.) SVG SCADA - Hot Water System & Strip Chart Recorder

This shows a real-time interactive SVG SCADA drawing of the PID control loop for building's heating hot water system. The controller modulates the steam control valve at the converter to maintain the desired hot water supply (HWS) temperature. The controller set point is adjusted from a reset schedule based on outside air temperature (OAT). Included is a continuous strip chart that records the hot water supply temperature, the outside air temperature, and the hot water system flow.
Sequence Of Operation:

Initially the hot water pump is shown as "OFF" at the button. As the operator, you can click the button to request the pump be turned "ON".

When the operator requests the pump ON action, a value is sent to activate the pump starter field device. This then returns a value to SCADA to change the button status display from OFF(red) to ON(green). Also the pump's impeller symbol will then be rotating, and flow arrows will move along the hot water piping.

When the pump is ON (green), the data from the field-mounted transmitters are sent over the DSN every two(2) seconds. When the values arrive at the SVG SCADA drawing, the dial of the various gauges moves to display their associated values. The position of the steam valve is also monitored each second, and displayed at the digital gauge. The continuous strip chart displays its changing values at each minute (simulated: 2 seconds = 1 min).
TT IC TT IC
Tune Controller:
SP: P: I: D: CO:
OFF OFF
Magnetic FT + - OutsideAirSteamSetpointAdjustBuildingHeatingSteam-to-Hot Water Converter
Valve Position
0
Percentage Open %
Status:
Message Pump: OFF