A 24V power supply is an important component of any modern industrial automation system that provides power. From its quality and reliability depends on the operation of the other components of industrial control systems. Therefore, his choice must be approached very thoroughly. If it breaks down, other equipment of such a measuring system may also fail.
Scheme
The 24V power supply consists of the following important components:
- security element;
- transformer;
- diode bridge;
- filter.
As a protection element, a fuse is most often used. In the event of any unforeseen situation in the input circuits, it will burn out and thereby 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 to a constant one. The last element (filter) is designed to prevent ripple at the output of the device.
main parameters
The main technical parameters that characterize the 24V power supply :
- number of output channels;
- output voltage and current;
- device power;
- mounting method.
Let's start with the last one. Outdated modifications of such devices have a bolt mount. Newer ones use DIN rails for these purposes. The power of the block is the current multiplied by the voltage. That is, these parameters are interconnected. In turn, the output current characterizes the load capacity of a given element of the power supply system. The larger it is, the more powerful consumers can be connected to it. Quite often, there are modifications of power supplies that have one input channel and several output.
For example, MTM-140 from one input to 220 V can make 5 output circuits to 24 V. A similar practice occurs in cases where consumers are low-power. As an example
various pressure, temperature or flow transmitters can be provided.
Customization
Recent developments in this area have already been built on the basis of microprocessor technology. This innovation allows them to be connected to personal computers using RS-232 or USB and, using specialized software, configure a 24-volt power supply. An example of such a device is the BPS-4090 from the domestic company Elemer. It connects using the RS-232 serial port . The necessary software is provided free of charge, and it can be downloaded without problems from the official website of the manufacturer. There is only one drawback in this situation - the wire for connection is not included, and it must be purchased separately or made independently.
Connection
Most devices such as a 24V power supply, uses a standard circuit to connect. 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 - grounding (yellow-green or black).
The output circuit is connected to the contacts "+" 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 multi-channel, it is important to track that there is one consumer on one channel. In the event of an error during switching, failure of any component of the system is possible.
Conclusion
A 24V power supply is a necessary component of modern measuring systems. Without his participation, it is already impossible to imagine their work. The characteristics and recommendations given within this material allow you to select and connect any device of this class.