Using PULS UK’s QTD20 power supplies, companies can make use of kinetic energy produced by AC electric motors to safeguard PLC control circuits in the event of a mains failure.
Modern production machines use AC motors controlled by frequency converters or servo amplifiers and have an intermediate DC bus to which all individual drives are connected. By connecting the PULS QTD20 directly to the DC bus the need for a separate low voltage supply for control equipment can be avoided.
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, to support the PLC until the motor has come to a complete stop. This ensures that important equipment is kept operational long enough for a controlled shutdown to take place. Until recently this energy was not usable owing to the high EMC levels present. However, improved filtering technology has now made this possible.
PULS UK
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