24V power supply is an important part of anymodern industrial automation system, which provides electricity. From its quality and reliability depends on the work of the other components of the industrial control system. Therefore, his choice must be approached very thoroughly. If it breaks down, other equipment of such a measuring system can fail.
The scheme
The 24V power supply consists of the following important components:
- protection element;
- transformer;
- diode bridge;
- filter.
As a security feature most oftenuse a fuse. In the event of any unforeseen situation in the input circuits, it will burn out and thus ensure the safety of the remaining elements of the device. In this case, the transformer lowers the input voltage (usually 220 V or 380 V) to the required 24 V. In turn, the diode bridge converts the alternating signal into a constant one. The last element (filter) is designed to prevent ripples at the output of the device.
Main settings
The main technical parameters that characterize the power supply 24V:
- number of output channels;
- output voltage and current;
- device power;
- mounting method.
Let's start with the last one.Outdated modifications of such devices are bolted. Newer for these purposes use DIN-rails. The power of the block is the current multiplied by the voltage. That is, these parameters are interrelated. In turn, the output current characterizes the load capacity of this element of the power supply system. The bigger it is, the more powerful consumers can connect to it. Quite often there are modifications of power supplies, which have one input channel and several output.
Various measuring transducers for pressure, temperature or flow can be provided.
Customize
Recent developments in this area have already been built.based on microprocessor technology. This innovation allows you to connect them to personal computers using RS-232 or USB and, using specialized software, configure the power supply to 24 Volts. As an example of such a device, BPS-4090 from the domestic company "Elemer" can be cited. It connects using the RS-232 serial port. The necessary software is provided free of charge, and it can be easily downloaded from the official website of the manufacturer. There is one minus in such a situation - the wire for connection is not included in the kit, and it must be purchased separately or independently manufactured.
Connectivity
Most devices like the 24V power supply, uses a standard connection scheme. The only difference is the number of output channels. Three wires are used at the input:
- L - phase (brown wire).
- N is zero (blue).
- GND - ground (yellow-green or black).
The output circuit is connected to the “+” and"-". At the same time, the plus of the consumer was connected to the first, and its minus to the second. If the source is multichannel, then it is important to track that there is one consumer on one channel. In the event of a switching error, the failure of any component of the system is possible.
Conclusion
24V power supply is a necessary componentmodern measuring systems. Without his participation, it is no longer possible to present their work. The characteristics and recommendations given within the framework of this material allow you to select and connect any device of this class.
