Switch-mode power supplies with built-in diagnostics

High levels of efficiency as well as compact dimensions and moderate heat generation are distinguishing features of primary switch-mode power supplies. Weidmller has single and three-phase primary switch-mode power supply units on offer in versions from 25 W to 1000 W. Their first-class price/performance ratio is a compelling benefit.

Depending on the model, the input voltage of the single- and three-phase connectPower switch-mode power supplies is 115/230V AC or 3 x 400V AC.

Under maximum load the units achieve efficiency ratings of up to 88 per cent. Furthermore, they reduce harmonic currents through the use of power factor correction (PFC), and an integrated diagnostics and status output helps to maximise system availability. An optional signalling contact is implemented as a changeover contact.

Each device output is short-circuit proof by design. The 24V DC output voltage can be adjusted via a potentiometer from 24-28V DC. Output is electronically limited to 105-130 per cent.

If required, the units can easily be operated in parallel to increase power capacity or for redundancy purposes. In this case, a special diode module from the connectPower range is advisable for the modules CP SNT 70 W to CP SNT3 500. Both switch-mode power supply units operate in parallel with the diode module and share the power drawn by the load. If one of the units fails, the second unit provides the full amount of power required. The diode module completely decouples the two units; neither of the units can therefore negatively affect the other if a fault occurs.

A green LED indicator signals that the unit is operational. The more powerful versions are enclosed in a metal housing. CP SNT switch-mode power supplies operate reliably without derating between -10 and +55degC. The silicone-free units are designed to be mounted horizontally onto TS 35 mounting rails - with no tools needed. The CE mark and UL approval underline the supplies' suitability for applications across the globe.