DPI Series

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Voltage DIP Proof Inverters

The DPI (Dip Proof Inverter) protects against voltage interruptions (zero volts) AND momentary sags. A VDC (Voltage Dip Compensator) only protects against momentary voltage sags. The DPI provides a voltage ride through solution for process controls that suffer from voltage interruptions (including sags) less than 3 seconds in duration. Losses incurred from power quality disturbances far outweigh the cost of installing a DPI.

Category:

Data Sheets & Downloads

DPI 54S & 54L DPT Manual (462.6 Kb) [PDF]

Bypass Switch (BPSW25A) Brochure (1.1 Mb) [PDF]

Promotional Literature:

Brief Intro to Power Quality Problems (16.8 Kb) [PDF]
Difference between VDC and DPI (1.1 Mb) [PDF]
Why a DPI should not be compared to a UPS (20.2 Kb) [PDF]

 User Manual:

DPI 54S / 54L Manual (462.6 Kb) [PDF]
DPI 53S / 54L Manual (889.7 Kb) [PDF]
DPI 52 Series Manual (809.1 Kb) [PDF]

Options:

Two Level Timer Data Sheet (14.9 Kb) [PDF]
High Noise Immunity Data sheet (15.7 Kb) [PDF]
Inverter Running Monitor Output (19.6 Kb) [PDF]

Tools:

DPI Sizing Guide
Sag Simulator User Manual (254.9 Kb) [PDF]
PSCOS – Programmable Static Switch (226 Kb) [PDF]

Product Description

The reliability of electrical power to industry is in general very high, nevertheless voltage sags and short power interruptions or voltage dips occur. These instabilities are caused by short circuits, lightning strikes on overhead power lines and heavy load switching. The duration of such faults is generally shorter than one second.

The VOLTAGE DIP- PROOFING INVERTERS (DPI) are designed to maintain the switch gear control voltage during voltage dips, effectively keeping the plant connected. The stored electrical and magnetic energy is allowed to flow, supporting the mechanical inertia of the machinery. When the power is restored after a short voltage dip, the plant is still running at near synchronous speed, the inrush currents will be small and the stress to the system minimal.

The VOLTAGE-DIP PROOFING INVERTER (DPI) is designed to be maintenance free and highly reliable. It consists of a static switch in series with, and an inverter parallel to, the load. Energy is stored in a capacitor bank.

The up-time that a DPI can achieve is dependent on the usable energy in the storage capacitors and on the characteristics of the supported load. Load characteristics are critical in determining the up-time. Resistive loads with a power factor near 1 consume real power and the up-time will be shortest. Resistive loads include lamps, switch mode power supplies and linear power supplies. Contactors use little real power as they are a reactive load with power factors around 0.15. Reactive loads such as contactors give the longest up-time.

Features

  • Supports components susceptible to voltage events ie. Contactors, relays, solenoids, PLC and other control elements
  • Batteryless, therefore no replacement and maintenance costs or hazardous waste
  • Fast (<700 micro-seconds) transfer, offline system that fails to safety
  • No need to oversize as with a UPS or CVT
  • Sized depending on load current, power factor and desired ride through time
  • Accurate application control with adjustable ride through time and variable voltage transfer level

Applications

  • Control Contactors and Relays
  • Motor Starter Circuits
  • Continuous Factory Control processes
  • Semiconductor equipment processes
  • Instrumentation Systems
  • Industrial PLC Controls
  • Plastic Extrusion processes
  • Beverage and Bottling processes
  • Material handling systems

Specifications

Mechanical Construction

54S Series – The DPI case is made from extruded aluminium sections. The four parts that make up the case are interlocked and secured by screws. NOTE: there are no user serviceable parts inside the unit. All adjustment points are marked on the top cover plate and can be reached by removing the two screws securing the main label.

54L Series – The DPI case is made from extruded aluminium sections. The six parts that make up the case are interlocked and secured by screws. NOTE: there are no user serviceable parts inside the unit. All adjustment points are marked on the top cover plate and can be reached by removing the two screws securing the main label.

Electrical

54S Series
Max Current: 8A
Max Voltage: 120, 208, 240Vac

54L Series
Max Current: 25A
Max Voltage: 120, 208, 240Vac

NOTE: 50A Models – On Request

Temperature

Maximum Working Temperature 45°C (113°F)

Housing

Construction: Extruded Aluminium

54S Series
Height: model dependent (see manual)
Width (mm): 150
Depth (mm): 110
Mass: model dependent (see manual)

54L Series
Height: model dependent (see manual)
Width (mm): 350
Depth (mm): 231
Mass: model dependent (see manual)

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