In order to implement the automated scheme of controlling the position of pipeline dampers (by moving the damper drives) to change the rate of filling of the water tanks and to control the performance of damper drives, you can use controllers of the «Impulse 112» series along with the sensors and control mechanisms for these controllers.
In order to implement the automated scheme of controlling the position of pipeline dampers (by moving the damper drives) to change the rate of filling the water tanks and to control the performance of damper drives, you can use controllers of the «Impulse 112» series along with the sensors and control mechanisms for these controllers.
In our case, we use the following automation equipment:
Three-phase current sensors SCG2-OW-25-3 are used to control current to the damper drives: excess of electrical current or the lack thereof will result in raising threshold signals in the controller that will activate an audiovisual signal to notify about the malfunctioning of the damper drives.
The module of relay outputs SDOG2-OW-8R is used to switch the equipment on or off.
The binary inputs module SDIG2-OW-16 is used to connect dry contacts of limit switches of the damper drives, to show the direction of the damper movement (up or down) and count the number of pulses as the feedback coming from the reducer. To organise the feedback channel from the reducer, it's shaft is equipped with a mechanism based on a wheel with an eccentric where each spin of the wheel results in a click on a micro button that clamps the connected "dry contact".
The modules of information display (SING2-OW-3) are used to indicate the current filling of water tanks and the current percentage of the opening of dampers. Three-section indication parts of the SING2-OW-3's are mounted on the door of the metal box along with LEDs for continuous showing the visual alerts.
Pressure sensors will be telling us the degree of filling of water tanks.
All of the said above sensors except for the pressure sensors, are connected in parallel to the digital bus with the controller «Impulse 112.3» with the transmission protocol being 1-Wire at 12 Volts. The analog pressure sensors are connected to the analog ports of the controller «Impulse 112.3». Connecting of analog pressure sensors is recommended using the shielded wire. The pressure sensor contacts are connected to terminals «+» and «D» of the analog port of the controller and the shield must be connected to terminal «-».
The «Impulse 112.3» controller transfers the data to the control room over an IP network via the wired Ethernet channel. This allows the operator in the control room to «see» the current positions of valves as well as the current filling of water tanks and to analyze how well the pumping station performs.
To set up the calculation of the current position of dampers the following software mechanisms of the controller «Impulse 112.3» are used:
Thus, as the pulses at the preconfigured discrete ports of the module SDIG2-OW-16 received, the controller initiates the recalculation of the according formulas for the damper position estimation, and the computation values with the latest damper positions are stored to the memory cells. After the memory cells contents are updated, these last values are sent to the registers of the digital information display modules.
A similar way it happens for the computation of the values of the current pressure to estimate the current volume of water in the tank in cubic meters (or other units), but in this case the formulas are based on the data from the analog ports that are connected to the «Impulse 112.3» controller.
If the threshold values of current at the damper drives are met (below normal and/or above normal values), the siren alarm and according indicator lights are enabled.
Automatic adjustment of the damper is made according with the threshold values spans that the overall scale of filling of the water tanks is split into.