Rockwell Automation 1413-ME-PEA Capacitor Bank Controller - Series B - Manual (Page 7)

5 Publication 1413-UM001C-EN-P - May 2006
Chapter
1
General Information
Introduction The capacitor bank controller is a replacement for standard,
fixed-function capacitor controllers currently on the market. The
controller consists of standard, off-the-shelf, Allen-Bradley hardware
with the application ladder code necessary to perform power factor
correction. The controller is designed to provide the same base
functionality as a fixed-function capacitor bank controller. Also, you
may add additional code to the controller to fit its functionality to
special circumstances.
Description of the
Capacitor Bank Controller The capacitor bank controller is a pre-engineered control system
containing a MicroLogix 1500 controller, a standard data access
terminal (DAT), one or more Powermonitor 3000 modules, and an
optional additional human-machine interface (HMI). Pre-engineered
ladder logic code in the controller gathers real and reactive power
data from up to four power feeds (utility feeds and/or generators).
The logic operates on the data in standard engineering units of kVAR
and kW and acts to minimize imported and exported reactive power
by switching up to 10 steps of capacitance. This strategy controls
power factor while reducing the likelihood of voltage surge caused by
excessive kVAR export.
Functions
• Auto configure
• Manual configure
• Discharge timer on each step
• Selectable operating modes
– Manual operation
– Linear, last-in, first-out
– Balanced, level-out usage of capacitor steps
– Optimal, finds best match of capacitor step to system kVAR
needs
– Special, customer-defined
– %THD, Linear mode with a voltage %THD setpoint