4-40 DGC-2020 BESTCOMSPlus Software 9400200990 Rev I
Figure 4-37. Overcurrent Protection Settings
A
Pickup: Adjustable from 0.9 to 7.75 Aac for 5 Aac current sensing (style number 5xxxxxxxx) or 0.18 to
1.18 Aac for 1 Aac current sensing (style number 1xxxxxxxx).
B
Alarm Configuration: None, Alarm, or Prealarm
C
Time Dial: Adjustable from 0 to 30 s for F (fixed) curve, 0 to 9.9 for all other curve selections.
D
Curve: A, B, C, D, E1, E2, F, G, I1, I2, L1, L2, M, S1, S2, V1, or V2.
E
Overcurrent Pickup Curve.
F
Low Line Scale Factor: Adjustable from 0 to 3.000 in 0.001 increments.
G
Display: 1 Phase or 3 Phase.
BREAKER MANAGEMENT
DGC-2020 breaker management features include the control of two, continuous- or pulse-controlled
breakers, load transfer upon detection of a mains failure, two modes of automatic genset synchronization,
and settings for stable or dead bus detection. Open transitions are implemented in load transfers to and
from the mains.
The description of breaker management is organized as follows:
• Breaker Hardware
• Bus Condition Detection
• Synchronizer
Breaker Hardware
By default, one (generator) breaker is enabled
A
for control and monitoring by the DGC-2020. In
applications requiring control of a generator breaker and mains breaker, a second (mains) breaker can be
enabled
B
and configured.
When two breakers are configured (enabled), the DGC-2020 can be enabled to automatically transfer
load power from the mains to the genset during a mains failure
C
. This feature also enables the DGC-2020
to transfer the load back to the mains once mains power is restored. Settings include a transfer delay
D
,
return delay
E
, and max transfer time
F
.
Breakers controlled by pulse or continuous inputs are supported
G
. Separate settings for each breaker’s
open
H
and close
I
pulse widths are provided.
During synchronization of the generator with the bus (Anticipatory mode only), the DGC-2020 uses the
breaker closing time
J
to calculate the optimum time to close the breaker.
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