9400200990 Rev I DGC-2020 BESTCOMSPlus Software 4-33
Figure 4-29. Sender Fail Configuration
A
Coolant Temp Sender Fail: None, Alarm, or Prealarm, time delay adjustable from 5 to 30 min in 1 min
increments.
B
Oil Pressure Sender Fail: None, Alarm or Prealarm, time delay adjustable from 0 to 300 s in 1 s
increments.
C
Fuel Level Sender Fail: None, Alarm, or Prealarm, time delay adjustable from 0 to 300 s in 1 s
increments.
D
Voltage Sensing Fail: None, Alarm, or Prealarm, time delay adjustable from 0 to 300 s in 1 s
increments.
E
Speed Sender Fail: Time delay adjustable from 0 to 300 s in 1 s increments.
GENERATOR PROTECTION
Two tiers of generator protection are offered. DGC-2020 controllers with style number xxxxxxSxx offer
standard protection consisting of undervoltage (27), overvoltage (59), overfrequency (81O),
underfrequency (81U), reverse power (32), and loss of excitation (40) elements. Controllers with style
number xxxxxxExx offer enhanced protection, which consists of the standard protection elements plus
phase-sequence voltage (47) and time overcurrent (51) elements.
The description of generator protection is organized as follows:
• Voltage (27, 59, 47)
• Frequency (81)
• Reverse Power (32)
• Loss of Excitation (40Q)
• Overcurrent (51)
Voltage Protection (27, 59, 47)
Voltage protection consists of two undervoltage elements, two overvoltage elements, and one phase-
sequence voltage element (style number xxxxxxExx only).
Undervoltage (27-1, 27-2)
Two sets of undervoltage settings are provided for each element: one for three-phase generator
connections and one for single-phase generator connections. The pickup setting entered is based on the
VT secondary side (DGC-2020). When a single-phase override contact input is received, the DGC-2020
automatically switches from the three-phase undervoltage settings to the single-phase undervoltage
settings.
An undervoltage condition is annunciated when the average of the three-phase (three-phase mode) or
the line-to-line voltage (single-phase mode) decreases below the corresponding 27 pickup setting
A
for the
duration of the corresponding 27 activation delay
B
. An undervoltage annunciation can be user-selected to
trigger a pre-alarm
C
(warning) or alarm
C
(shutdown). An undervoltage annunciation can also be user-
configured to close a programmable output.
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