4-20 DGC-2020 BESTCOMSPlus Software 9400200990 Rev I
output can be configured to open upon the conclusion of engine cranking or remain closed as long as the
engine is running
G
.
The Pre-Start can be configured
H
during the resting state. If Preheat Before Crank is selected, the Pre-
Start output will be closed for a time equal to the Pre-crank delay time prior to re-entering the cranking
state. If the Pre-crank delay setting is longer than the rest interval, the Pre-Start output will be closed for
the entire rest time.
Under normal operation, engine rpm is used to determine crank disconnect. The Oil Pressure Crank
Disconnect
I
provides a secondary indication that the engine is running so that the starter will be
disconnected even if no engine rpm sources are functioning. When enabled, oil pressure is used as a
check of whether the engine is running. If the engine oil pressure is above the threshold
J
, the starter will
be disconnected from the engine.
BESTCOMSPlus engine cranking settings (DGC-2020, System Parameters, Crank Settings) are
illustrated in
Figure 4-17.
Figure 4-17. Engine Crank Settings
A
Cranking Style: Cycle or Continuous.
B
Number of Crank Cycles: Adjustable from 1 to 7 cycles in 1 cycle increments. Controllers configured for
NFPA compliance have a 1 to 3-cycle range.
C
Cycle Crank Time: Adjustable over the range of 5 to 15 seconds in 1 second increments.
D
Continuous Crank Time: Adjustable from 5 to 60 seconds in 1 second increments. Controllers
configured for NFPA compliance have a 1 to 45 second range.
E
Crank Disconnect Limit: Adjustable from 10 to 100% of nominal engine speed.
F
Pre-Crank Delay: Adjustable from 0 to 30 seconds in 1 second increments.
G
Pre-Start Contact Configuration: Open After Disconnect or Closed While Running.
H
Prestart Rest Configuration: Off During Rest, On During Rest, or Preheat Before Crank.
I
Oil Pressure Crank Disconnect Enable: Disable or Enable.
J
Crank Disconnect Pressure (psi): Adjustable from 3 to 150 psi in increments of 1 psi.
Automatic Restart
If the DGC-2020 has shut down due to an alarm condition, the automatic restart, when enabled
A
, will
automatically clear alarms. An attempt to restart the engine is made after a predetermined time delay
B
if
the ATS contact input is closed. If an ATS contact is not present, the unit will remain in READY state with
its alarms cleared. A restart will not be attempted if a low fuel alarm or emergency stop is present. The
number of restart attempts
C
is programmable. Automatic restart attempts are recorded in the event log.
BESTCOMSPlus automatic restart settings (DGC-2020, System Parameters, Automatic Restart) are
illustrated in Figure 4-18.
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