CBC-8000 capacitor bank control description
10 CBC-8000 capacitor bank control installation and operation instructions MN916001EN—October 2018 Eaton.com
If adaptive voltage sensing is also enabled, other automatic
control conditions will only be considered if a control
operation will not cause an OVUV condition.
Emergency voltage control
The emergency voltage control feature allows control of the
capacitor bank if the line voltage measured by the control is
outside of the emergency voltage thresholds for a
configurable period of time.
If adaptive voltage sensing is also enabled, other automatic
control conditions will only be considered if a control
operation will not cause an emergency OVUV condition.
VAR control
The VAR control feature allows control of the capacitor bank
if the fundamental kvar measurement is outside of a
configurable threshold for a configurable period of time.
• The configurable thresholds are the trip and close points,
which are in kvar.
• The configurable period of time that the kvar value must be
outside of a threshold is the var track time, which is in
seconds.
The control stops tracking kvar measurements if the
capacitor bank is already tripped and the kvar value is below
the trip point or the capacitor bank is already closed and the
kvar value is above the close point.
Time control
The time control feature allows daily control of the capacitor
bank when the local time reaches the On time or Off time.
• On time – When the local time reaches the On time, the
control closes the capacitor bank and it remains closed
until the local time reaches the Off time.
• Off time – When the local time reaches the Off time, the
control opens the capacitor bank and it remains open until
the local time reaches the On time.
Time control can be used during the week (Monday through
Friday) and on the weekend. In addition, the control supports
the following time control options:
• Holidays – User-defined holidays and perpetual holidays,
which are holidays that do not occur on a specific date,
such as Thanksgiving, Memorial Day, and Labor Day.
• ON/OFF control – On/Off control with a selectable Off
state. During the On time period, the control will only
operate local controls. During the Off time period, the
control will remain in one of three configurable states: Trip,
Close, or the last known state. Also, during the Off time
period, only manual, SCADA, fault, and emergency
controls will be allowed.
• Weekend ON/OFF control – Weekend On/Off control
only applies to Saturday and Sunday. When the local time
reaches the weekend On time, the control closes the
capacitor bank and it remains closed until the local time
reaches the Off time. When the local time reaches the
weekend Off time, the control opens the capacitor bank it
remains open until the local time reaches the On time.
Temperature control
The temperature control feature allows control of the
capacitor bank if the temperature is outside of the
temperature thresholds for a configurable period of time.
The control action that occurs is configurable:
• None – Do not perform an operation.
• Trip above – Perform a trip operation when the
temperature is above the threshold.
• Close above – Perform a close operation when the
temperature is above the threshold.
• Trip above close below – Perform a trip operation when
the temperature is above the threshold and perform a
close operation when the temperature is below the
threshold.
• Trip below – Perform a trip operation when the
temperature is below the threshold.
• Close below – Perform a close operation when the
temperature is below the threshold.
• Close above trip below – Perform a close operation when
the temperature is above the threshold and perform a trip
operation when the temperature is below the threshold.
Note: Make sure the actions that are specified for the
minimum and maximum thresholds do not cause
conflicting control operations. For example, the
minimum action cannot be trip above if the maximum
action is close below.
Sensor input control
The sensor input control feature allows control of the
capacitor bank if the sensor input value stays outside of a
configurable threshold for a configurable period of time.
Equipment damage.
The maximum input voltage that can be applied to sensor
inputs in the control is 10 V RMS.
Failure to comply may result in equipment damage. C1105.0
The control action that occurs is configurable:
• None – Do not perform an operation.
• Trip above – Perform a trip operation when the sensor
input value is above the threshold.
• Close above – Perform a close operation when the sensor
input value is above the threshold.
• Trip above close below – Perform a trip operation when
the sensor input value is above the threshold and perform
a close operation when the sensor input value is below the
threshold.
• Trip below – Perform a trip operation when the sensor
input value is below the threshold.
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