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Rolling Shutter Motor Control(SN74LV14APWR)

2015-03-03 08:08  
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This article describes the Rolling Shutter Motor Control (SN74LV14APWR). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: SN74LV14APWR.

An electrically operated rolling shutter usually has a standard control panel with a three-position switch: up, down and stop. If you would like to automate the opening and closing with a time controlled switch, a few additional wires will have to be connected. Typically, the controls are implemented as indicated in the schematic ‘Normal Situation’. If this is indeed the case, then you can see in ‘New Situation’ how the shutter can be automated with a timer. There is only one method to determine the actual schematic of your control circuit, and that is to open the control box and using an ohmmeter, pencil and paper to check out and draw the circuit. Make sure you turn the power off ?rst though! Connect a 230-V relay (with both the contacts and the coil rated 230VAC) to the timer.

Figure:1 Circuit diagram

Figure 1 Circuit diagram

The changeover switch between automatic and manual control needs to be rated 230VACas well and may not be a hazard for the user. The relay and switch are preferably fitted in a plastic mains adapter enclosure with built-in plug, which is plugged into the timer. It is a good idea to check first if this will actually ?t. Because of the manual/automatic-switch, the operation is completely fail-safe and misunderstandings are out of the question. The switch prevents the issue of conflicting commands (with disastrous consequences) when, for example, the shutter is being automatically raised and manually lowered at the same time.

Figure:1 Circuit diagram

Figure 2 Circuit diagram



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