Winco DGC-2020 - Manual (Page 74)

4-24 DGC-2020 BESTCOMSPlus Software 9400200990 Rev B
Alarm and pre-alarm annunciations for loss of engine speed signals is not user-programmable and
operates as follows. If the MPU (magnetic pickup) or generator frequency is programmed as the sole
engine speed source and that signal source fails, an alarm (and shutdown) is triggered. If the engine
speed source is configured as MPU and generator frequency and a loss of one of the signal sources
occurs, a pre-alarm is annunciated. An alarm (and shutdown) is triggered if both speed signals are lost.
BESTCOMSPlus settings for the sender fail functions (DGC-2020, Alarm Configuration, Sender Fail) are
illustrated in Figure 4-23.
Figure 4-23. BESTCOMSPlus Sender Fail Setting
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), and
underfrequency (81U) 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)
• Overcurrent
(51)
Voltage Protection
Voltage protection elements consist of undervoltage, overvoltage, and phase-sequence voltage (style
number xxxxxxExx only). BESTCOMSPlus voltage protection settings (DGC-2020, Generator Protection,
Voltage) are illustrated in Figure 4-24.
Undervoltage (27)
Two sets of undervoltage settings are provided: one for three-phase generator connections and one for
single-phase generator connections. The pickup setting entered is based on the VT secondary side