The DPI25 Series voltage dip proofing inverters available from Westek Electronics are designed for voltage dip compensation in motor control applications.
The DPI25 Series voltage dip proofing inverters are designed for motor control applications in situations where:
- There are frequent voltage dips and momentary interruptions to power
- Momentary interruptions to processes are expensive
- It is critical to maintain operations such as lifts and conveyors
Essentially an offline inverter in series with the load, the DPI25 is powered by an electrolytic capacitor normally kept fully charged via a static switch.
In the event of a voltage dip, momentary short circuit or interruption, the static switch opens and the inverter connects to the load.
A timer controls the duration of operation of the inverter so as to time out and disconnect power to the load if mains have not been restored within this period.
When power is restored within the set time period, the inverter is first synchronised to the mains before handing control back to the static switch to avoid voltage build-up on the load and ensure a smooth transition.
The DPI25 Series voltage dip proofing inverters are ideal for operation in motor control centres and switchboards, and generally where control relays need to remain energised for short periods so as to provide ‘ride-through’ for motors, for instance.
The DPI25 Series offers excellent performance in applications where constant voltage transformers such as ferro-resonant transformers would otherwise be installed, as these do not operate in constant voltage mode below 60% of nominal voltage.
The DPI25 will support the load even at zero mains voltage.
The DPI25 Series voltage dip proofing inverters are full bridge IGBT inverters providing a rectangular AC voltage whose peak is equal to the sine wave peak of the mains, and has a pulse duration providing the identical RMS value.
This allows loads such as relays and contactors to experience virtually the exact conditions as provided by mains voltage.
Models available in the DPI25 Series cover 120 volts and 208/230 volts at 50/60 Hz.