VSPFC Variable Step Power Factor Controller0 pages

Cognito Quam
Industrial Electronics, Control, Robotics and Automation
VSPFC Variable Step Power Factor Controller
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.
The VSPFC Variable Step Power Factor Controller
Variable compensating
capacitance step
Compensating or
regulating mode
Connection
Twelve bit inputs and
outputs
Option to use one bit
output to drive a fan
Current detection with
standard transformer
Dual standard serial
port
Functional front panel
Fully programmable
Supplies all relevant
quantities
Complete integration
Operation by nonspecialist personnel
Standard dimensions
VSPFC Feature Summary
Variable compensating capacitance step can be any combination of the
driven banks, effectively realizing an up to 4095 step system.
Operates in compensating or regulating mode 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.
Specific bit output can be assigned to drive a fan as a function of the
connected bank size sum.
5A CT secondary interface detects the CT apparent current and its phasedetected component (locked to the VSPFC supply voltage).
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.
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 regardless
of mode (regulating or compensating) and installation type (single- or threephase) for the line and the load.
Complete integration within a Quamatic or similar network or other
supervisory systems via an assigned bit input and output pair.
Simple, self-contained, unattended operation by non-specialist personnel.
Standard front panel cut-out dimensions (per DIN 43700).
r.1 Sep12 Copyright © 2012. Cognito Quam Ltd, PO Box 67212, Melissia, Athens 15102, Greece.
Tel/fax: +30.210.8049475 - http://www.cognitoquam.gr
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