VSPFC Variable Step Power Factor Controller

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The VSPFC variable step controller provides for different capacitor banks of any size to correct power factor in practically any arbitary minimum step and correction range size. At every sampling instant, the controller calculates the required compensation step and connects or disconnects a combination of banks whose sum is equal or closest to the calculated step value. As an example, four banks sized as x5, x2, x2 and x1 multiples of the smallest required step provide a decade of compensating operation and function as a typical ten equal step system. The maximum correction range possible with the VSPFC is when all its 12 outputs are employed in a binary weighted system (x1, x2, x4, x8 .. x2048) and equal to 4095 steps.
 

VSPFC Variable step power factor controller

  The controller has been designed for power factor control applications with the following features and characteristics:

• Variable compensating capacitance step can be any combination of the driven banks, effectively realizing an up to 4095 step system,
• Compensating or regulating mode of operation with the detecting current transformer (CT) either on the line or load side,
• Single- or three- phase connection,
• Twelve bit inputs and outputs to drive up to twelve capacitor bank switches with individual or group fault/error feedback,
• Option to use one bit output to drive a fan,
• Current detection with standard transformer,
• Dual standard serial communication port EIA(RS)232 for local communications and/or EIA(RS)485 for connection to Quamatic (and similar byte oriented) networks and remote sensors,
• Functional front panel with five digit plus sign LED display with four operator switches on the front panel protected to IP54 and covered by a polyester membrane,
• Fully programmable parameters and function can be set via the front panel or the serial port,
• Provides all quantities relevant to power factor control applications,
• Complete integration within a Quamatic or similar byte-oriented network or other supervisory systems via an assigned bit input and output pair,
• Simple, self-contained, unattended operation by non-specialist personnel, and
• Standard front panel cut-out dimensions (per DIN 43700).

The VSPFC operates in regulating or compensating mode. In regulator mode the current is detected at the line side and equals to the sum of the load and connected capacitor currents. In this mode the Controller switches capacitor banks in and out of the line to minimize reactive current at the line side. In compensator mode the current is detected at the load side and is equal only to the load current. In this mode the Controller switches the banks in and out of the line to compensate the detected reactive load current as closely as feasible by the available bank sizes.

The VSPFC is offered with accompanying setup and monitoring PC software, downloaded here (736K, zip archive).

Our CACSW integrated PF capacitor AC switch interfaces directly to each VSPFC bit I/O pair in switching and monitoring capacitor banks up to 3x25 A. Other power factor related products are summarized here with sampling/small quantities being available for online purchase here.

 

Assembled, ready-to-install power factor correction systems in wall mountable or free standing cabinets are available on a custom basis.