Choosing the Right
Power supply specialist RECOM
Power
DIN-rail power supplies offer several advantages over traditional power supplies.
They are modular, easy to install, and space efficient. They mount on a DIN-rail,
making them ideal for applications where space is limited or easy access to power
is required. They come in various sizes, voltages, and wattages, catering to different needs.
DIN-rail PSUs are standardized and trouble-free to install. The basic requirements
are fixed (single-phase or occasionally 3-phase input, a selection of standard outputs,
and power ratings), so many of the decisions are simplified.
In addition, the required input voltage operating range for most low or medium power ac-dc supplies is standardized worldwide to 90 V AC - 264 V AC, with only slight variations between countries.
That said, there are still a few specifications that can cause problems.
DIN-Rail
Temperatures outside of this range can cause a range of issues. High operating temperatures can cause performance to be derated; they also reduce operating life and increase the risk of malfunctions and failures.
Low temperatures can also cause performance problems, including increased output ripple and poor output regulation. In addition, changes in electrical characteristics at low temperatures may result in failure to start. When selecting a DIN-rail power supply, make sure that the unit can meet the requirements at the maximum operating temperature, taking derating into account if needed.
Also check that the unit is guaranteed to start at the lowest operating temperature.
Make sure that the power supply can accommodate the types of loads required by the application.
In addition, the required input voltage operating range for most low or medium power ac-dc supplies is standardized worldwide to 90 V AC - 264 V AC, with only slight variations between countries.
That said, there are still a few specifications that can cause problems.
DIN-Rail
Power Supply Considerations
Operating temperature
Make sure that the power supply does not exceed its rated operating temperature.Temperatures outside of this range can cause a range of issues. High operating temperatures can cause performance to be derated; they also reduce operating life and increase the risk of malfunctions and failures.
Low temperatures can also cause performance problems, including increased output ripple and poor output regulation. In addition, changes in electrical characteristics at low temperatures may result in failure to start. When selecting a DIN-rail power supply, make sure that the unit can meet the requirements at the maximum operating temperature, taking derating into account if needed.
Also check that the unit is guaranteed to start at the lowest operating temperature.
Very long power cables
Resistance losses on long supply lines can cause a voltage at the load that is below allowable limits. There are several methods to counteract resistive losses, such as increasing the wire gauge, or increasing the output voltage (from 24 V to 48 V) and then using local DC/DC regulation at the load (PoL regulation).Capacitive or Inductive loads
Supplying power to these types of loads can cause problems. Inductive loads including motors, solenoids, and relays can cause high voltage spikes; supplying capacitive loads can reduce the dynamic load response of the power supply, or lead to instability and increased output ripple.Make sure that the power supply can accommodate the types of loads required by the application.