Din-Rail Power Supply Holds-Up When Mains Fails

The PULS DIMENSION QTD20 power supply can be connected directly to the intermediate DC-bus removing the need for a separate mains or low voltage supply for control equipment.

In the event of a mains failure, the QTD20 utilises the power from the DC-bus capacitors, which are charged from the kinetic energy of the motor until the motor has come to a complete stop. This ensures that the control equipment and other important peripheral equipment is kept operational long enough for a controlled shutdown to take place.

Intermediate DC-buses are not usually filtered and have high EMI noise superimposed. The PULS QTD20 has a very robust input stage with an appropriate input filter included. Additionally, the QTD20 is UL 508 approved and is equipped with input fuses rated and tested for 600VDC applications.

Harry Moore, Managing Director of PULS UK comments, “Our new QTD20 DIN-Rail power supply makes use of existing system power simplifying installation and wiring. Using the inherent hold-up capacity of the drive power is a unique feature of the QTD20, simplifying system design and ensuring safe operation.”

Key features include 600VDC input voltage optimised for intermediate DC-busses of drive systems, efficiency up to 95% with 125% peak load capability, active input transient filter, full output power between -25°C and +60°C, minimal inrush current, reverse input polarity protection, DC-OK relay contact, time saving quick-connect spring-clamp terminals and a 3 year warranty.