BECKWITH ELECTRIC M-6280A, Instruction Book

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M-6280A Digital Capacitor Bank Control
CAPACITOR BANK CONTROL OPERATION
Control Modes of Operation
The control includes two standard modes of Automatic Voltage Control (Classic Voltage Control and
Auto Adaptive Voltage Control), Optional VAr Control mode and Current Control mode are available.
Classic Voltage Control Mode: The control will make its Open and Close switching decisions based on
measured Line Voltage conditions and Time and/or Temperature overrides when applied. Voltage excursions
beyond the set value for greater duration than the time delay will result in appropriate control operation.
– Control Open Voltage: Adjustable from 95.0 to 140.0 V in 0.1 V increments
– Control Close Voltage: Adjustable from 95.0 to 140.0 V in 0.1 V increments
– Close and Open Time Delays: Definite or Inverse; adjustable from 0 seconds to 600 seconds, in 1
second increments. Timer reset can be selected as instantaneous or integrating.
– Time Override : In the Auto Control Mode a Time Override can be applied to capacitor bank Open
and Close operations. The Time Override feature considers Start Date, Start Time, End Date, End
Time, Duration, Recurrence Pattern and a Range Of Occurrences to implement the override.
– Temperature Override : In the Auto Control Mode a Temperature Override can be applied to capacitor
bank Open and Close operations. The Temperature Override feature considers sensed ambient
temperature and implements override action (Open, Close or None) for either above or below
temperature setpoint conditions.

NOTE : Time and Temperature Overrides can be overridden by Control Mode Limits.
Auto Adaptive Voltage Control Mode: This feature contains two control methods, Fixed or Average. The Fixed
method provides a Bandcenter setting the control compares to measure voltage to open or close the Capacitor
bank. The Average method uses an Effective Bandcenter based on a long term average of the input voltage to
compare to measure voltage to open or close the capacitor bank. Both methods employ an inverse timer and
Bandwidth to optimize bank operation and eliminate unnecessary switching. Also, Time and/or Temperature
overrides can be applied.
– Fixed-Band Center: Adjustable from 100.0 to 135.0 V in 0.1 increments
– Bandwidth (Multiple of Delta V): Adjustable from 1.0 to 2.0 in 0.1 increments
– Close and Open Time Delays: Inverse only; adjustable from 60 to 3600 seconds, in 1 second
increments. Timer reset is fixed as integrating.
– Time Override : In the Auto Control Mode a Time Override can be applied to capacitor bank Open
and Close operations. The Time Override feature considers Start Date, Start Time, End Date, End
Time, Duration, Recurrence Pattern and a Range Of Occurrences to implement the override.
– Temperature Override : In the Auto Control Mode a Temperature Override can be applied to capacitor
bank Open and Close operations. The Temperature Override feature considers sensed ambient
temperature and implements override action (Open, Close or None) for either above or below
temperature setpoint conditions.

NOTE : Time and Temperature Overrides can be overridden by Control Mode Limits.
*Only available with VAr and Current Control Mode option.