Product category:
AC/DC Power Supplies
News Release from: Puls UK | Subject: SL20
Edited by the Electronicstalk Editorial
Team on 12 November 2002
Supplies cut down on transients
Five new 480W power supplies feature a novel input circuit to reduce transient currents during cold-start operations.
High output power units normally create high transient currents that can cause the up-stream fuse to be triggered in error For example a 480W power supply normally produces 85A of transient current during the cold start process
This article was originally published on Electronicstalk on 2 Nov 2001 at 8.00am (UK)
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Smaller DIN-rail supply delivers up to 500W
With the new SL20.310 (24-28V/20 or 25A) Puls has released the latest version of its power supply classic, first introduced to the DIN-rail market by the Munich-based company five years ago.
DIN-rail supplies have voltage drops covered
The latest addition to the Dimension range of DIN-rail power supplies from Puls offers an answer to the age-old problem of the voltage drop inherent in longer cables.
Miniature supplies on the DIN rail
The ML15 range of DIN-rail power supplies offers a choice of 5, 12 and 24V DC single outputs in a tiny 22.5 x 75 x 91mm housing.
Puls now manufactures five different top-hat rail power supplies in this power range, with significantly reduced transient current.
An innovative circuit in the input reduces the current peaks to less than 17A at 25C and 37A at 50C.
Consequently there is no further interference to units in the vicinity of the mains supply and fuses are no longer triggered.
The limiter feature remains active in units which are still hot even in the event of temporary interruptions such as voltage drops in the mains supply, or temporary deactivation (eg for testing).
The new SL20 single-phase power supply series not only offers the standard 24-28V output voltage but also includes units with output voltages from 36 to 42 and 48 to 56V.
This means that a very wide range of applications can be met with low cost top-hat rail power supplies.
A unique feature for top-hat rail power supplies: one of the new units with an output voltage of 24-28V, the SL20.115, has a remote shutdown input for switching the unit on and off by remote control, either via a switch contact or an external signal voltage (eg from an SPS output).
All five new units have an AC115/230V auto select input, so they no longer have to be manually adjusted to the respective mains supply.
They are also fitted with the tried and tested Puls overload design, ie they do not shut down even in the event of a continuous overload (no hiccup) but instead continue to deliver up to 28A of continuous current with a reduced output voltage.
This provides for easy starting of even heavy loads such as motors with a high centrifugal mass or DC/DC convertors.
The units can be switched to a soft characteristic for parallel operation and in this way distribute the load evenly between the individual units.
Incidentally, in parallel mode even greater importance is attached to the active transient current limiter as all the power units are normally simultaneously connected to the mains supply and draw mains voltage.
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