- #Siemens vdo float switch how to#
- #Siemens vdo float switch install#
- #Siemens vdo float switch pro#
- #Siemens vdo float switch plus#
#Siemens vdo float switch plus#
We need to wire both float switches back to our control circuitry, plus we have to add the contacts and seal-in relay A. Great! We’ve got level control, reasonable pump-motor life, everything we could want, right? Let’s wire it up.
Regardless of level fluctuations, no more pump motor flutter. Similarly, once the high-level switch opens, the pump will not run until both switches have closed. The liquid level can fluctuate up and down, the low-level switch can open and close, and the pump will continue to run smoothly. Once the liquid level falls below the low-level switch, the pump will run until both switches are open. This cyclical action is called hysteresis. So when low-level switch L opens as the pump fills the tank, the seal-in relay keeps the circuit closed, and the pump keeps pumping. At the same time, seal-in relay A will be activated, closing the by-pass around low-level switch L. At that point, both the low-level and high-level switches will be closed, completing the circuit, and activating motor relay P to start the pump. In fact, the liquid level in the tank must fall below low-level switch L before the motor will start. But since both low-level switch L and seal-in relay A are open, the pump motor does not start. As the liquid level falls, high-level switch H closes. Let’s say a valve downstream of the tank is opened, allowing liquid to drain out of the tank. So no more liquid is coming into the tank from this pump. When the high-level switch opens, the motor relay P opens, stopping the motor, and seal-in relay A opens. However, seal-in relay A has been activated and closed, bypassing the now-open switch L (effectively “sealing it in”), so the pump continues to run until the high-level switch H opens. As the liquid fills past the first switch, it opens. When the liquid is below both switches, they are both closed the pump runs, filling the tank. The second switch (H) goes at the maximum desired level. The first switch (L) is set at the minimum liquid level desired in the tank. This circuit can be used to control a pump that fills a tank. So what can we do to protect the pump motor?Įnlarge ImageLet’s start by looking at Control Schematic 3 with two Normally Closed switches.
And now your simple solution has burned up a pump motor. It’s a very simple solution, but it’s also problematic because level fluctuations will cause the float to flutter, which will turn the pump motor on and off in quick succession. Mount or suspend your switch at the desired level, get your wires into a water-tight junction box (or out of the liquid containment area and then into a junction box), check the connections back to your control and power equipment, and you’re done. A two-wire float switch that can easily be used for turning a pump on or off. In both schematics, terminal 1 in the control circuitry represents the landing point for the float switch’s (+) wire, and terminal 2 for the (-) wire. Installation scenarios might include a Normally Open float switch turning on a pump to empty a tank (Control Schematic 2), or a Normally Closed float switch turning off a pump that fills a tank (Control Schematic 1). The rising action of the float can either close (i.e., turn on) a “Normally Open” circuit, or it can open (turn off) a “Normally Closed” circuit. Single Float Switch WiringĮnlarge ImageLet’s start with the most basic float switch: a two-wire, single-pole, single-throw float switch.
#Siemens vdo float switch pro#
However, with a little bit of fundamentals, you’ll be wiring like an old pro in no time. They certainly don’t apply in all scenarios, especially when additional control equipment is needed to handle large motors. These instructions and diagrams will serve to teach you the basics of float switch control wiring.
#Siemens vdo float switch how to#
We’ll look at single and double switch arrangements and how to wire them, and then look at equivalent circuits using Kari series float switches. We’re going to look at a progression of straightforward pump control arrangements using float switches.
Thinking carefully about when you want something off, and when it should turn on, will help you as you visualize the wiring and apply the schematic to real world control. Remember that what you’re wiring is a means of turning things on and off. Wiring a float switch isn’t necessarily hard, but it can be a little confusing if you don’t have a visual aid or two.
#Siemens vdo float switch install#
How do I install and wire my float switch? Where can I find a float switch circuit diagram? Where can I find a float switch wiring diagram? You asked, and today, we answer.
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