Safety is the most important thing, so you need to look for solutions that will provide it. Protection of motors powered by a three-phase network is carried out using a phase loss sensor. It is worth learning more about it.
Check phase loss sensors at Onninen wholesaler
What is the phase loss sensor used for?
In the event of a power outage, a solution must be sought. It is worth knowing how important a role phase loss sensors play here. These are electrical devices that detect the absence of a phase in a three-phase network. In the event of a phase loss, the engine may be damaged, and as a consequence, it may need to be repaired, which may involve high costs.
Each phase loss sensor works on a simple principle, namely it compares the amplitude and phases of signals coming from three phases of the supply network. If a phase is missing, the signal of one of the phases will have a different amplitude. As a result, the engine will switch off. Voltage asymmetry may also occur. It is also worth knowing that a properly selected sensor will protect electric motors from damage or complete destruction. The sensor sends a signal to the relay about the incorrect operation.
As a result, the relay can protect the motor from further damage. Then, when the phase returns, it is necessary to reconnect. The sequence sensors switch on one after another. Each voltage drop is very harmful to the electric motor. Phases are switched off, for example, as a result of a voltage drop, but also when there is complete asymmetry.
How to connect a phase loss sensor?
The phase loss sensor can be easily connected. This will protect the motor when a phase loss occurs in at least one phase. Importantly, it will also switch off when the voltage in any phase increases. Installing the device is really very simple. First of all, check the correct operation of the motor by verifying the value between the phases. Then unscrew the fuses of all phases and mount the sensor at the contactor. Use terminals that can be marked L1, L2, L3. Connect the terminals to the mains terminals of the contactor. Always do this from the fuse side. Then disconnect the power supply cable of the contactor control circuit from the phase. Finally, connect it to the terminal.
Phase failure sensors at the Onninen wholesaler
It is worth choosing the phase loss sensor F&F CKF-317 contacts: 1P, I=10A, adjustable threshold:165-180V, 1 module . This work sensor is indeed extremely functional and very sensitive. It has an adjustable threshold and one module. It protects the direction of engine rotation. Note that it has phase loss detection. The type of connection that occurs in it is a screw connection.
A good choice will also be the F&F CZF-BR phase loss sensor, contacts: 1P, I=10A, adjustable threshold: 165-180V, 2 modules from the F&F manufacturer. This is another model that is very popular. Unlike its predecessor, it has 2 modules. This is a sensor with a fixed asymmetry threshold. This model is distinguished by the fact that the time delay in the event of a power failure is no longer than 4 seconds.
Phase loss sensor F&F CZF-310 contacts: 1P, I=10A, 1 module may also be a suitable solution. This relay has a fixed asymmetry threshold. It is equipped with phase asymmetry control. However, it does not have phase sequence control. Here too, the time delay is 4 seconds.