4-22 DGC-2020 BESTCOMSPlus Software 9400200990 Rev I
Sensing Transformers
Three sets of transformer settings configure the DGC-2020 for operation with a specific system. These
settings, along with the generator voltage, generator current, and bus voltage detected by the DGC-2020,
enable the DGC-2020 to accurately meter system values, offer generator protection, and synchronize the
generator with the bus (style number xxxxxxxAx only).
Generator PT Settings
The generator PT settings establish the nominal primary
A
(generator side) and secondary
B
(DGC-2020
side) voltage levels at the generator voltage-sensing transformer.
Generator CT Setting
The generator CT setting
C
establishes the nominal, primary (generator side) current level at the generator
current sensing transformer. The secondary value of the generator CT is dictated by the style number of
the controller. A DGC-2020 with a style number of 1xxxxxxxx uses a nominal CT secondary rating of 1
Aac. A DGC-2020 with a style number of 5xxxxxxxx uses a nominal CT secondary rating of 5 Aac.
Bus Transformer Settings
Primary and secondary bus transformer ratings are used by the automatic transfer switch function, which
monitors a single-phase bus input to detect mains failure. Controllers equipped with an automatic
synchronizer (style number xxxxxxxAx) also use the primary and secondary bus transformer ratings. The
primary setting
D
establishes the nominal voltage present at phases A and C of the bus. The secondary
setting
E
establishes the nominal voltage seen at the bus voltage input of the DGC-2020.
BESTCOMSPlus sensing transformer settings (DGC-2020, System Parameters, Sensing Transformers)
are illustrated in Figure 4-20.
Figure 4-20. Sensing Transformers Parameters
A
Gen PT Primary Volts: Adjustable from 1 to 9999 Vac in 1 Vac increments.
B
Gen PT Secondary Volts: Adjustable from 1 to 480 Vac in 1 Vac increments.
C
Gen CT Primary Amps: Adjustable from 1 to 5,000 Aac in 1 Aac increments.
D
Bus PT Primary Volts: Adjustable from 1 to 9999 Vac in 1 Vac increments.
E
Bus PT Secondary Volts: Adjustable from 1 to 480 Vac in 1 Vac increments.
PROGRAMMABLE INPUTS
DGC-2020 contact inputs can be assigned to trigger various functions and, when triggered, annunciate an
alarm or pre-alarm. A user-assigned label can be assigned to each input to make identification easier.
The description of these settings is organized as follows:
• Configurable Local Inputs
• Programmable Functions
• Configurable Remote Inputs
Configurable Local Inputs
Each of the 16 contact inputs can be independently configured to annunciate an alarm or pre-alarm
A
when the input senses a contact closure. A user-adjustable time delay
B
can be set to delay recognition of
a contact input. By default, all inputs are configured so that they do not trigger an alarm or pre-alarm.
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