Basler Electric DGC-2020HD - Manual (Page 279)

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properly spin down before attempting to restart. This setting accepts values from 0 to 120 seconds, in
increments of 1 second.
Cranking
The DGC-2020HD can be programmed for either cycle or continuous cranking. Cycle cranking provides
multiple engine starting attempts. Each starting attempt consists of a fixed interval of engine cranking
followed by a rest interval of the same duration. Continuous cranking provides a single, extended engine-
starting attempt.
Crank Disconnect
Under normal operation, engine rpm is used to determine crank disconnect. The Crank Disconnect Limit
setting establishes the engine rpm percentage at which the starter is disconnected.
Oil Pressure Crank Disconnect provides a secondary indication that the engine is running. This ensures
that the starter is disconnected, even if no engine rpm sources are functioning. When enabled, oil
pressure is used to determine if the engine is running when no valid speed source is detected. If the
engine oil pressure is above the threshold and no valid speed source is detected, the starter is
disconnected from the engine. If a valid speed source is detected, the oil pressure crank disconnect
function is inhibited to prevent an undesired crank disconnect when oil pressure rises above the threshold
during normal engine cranking.
Cool Down
After the load is removed from a genset, the DGC-2020HD implements a smart cool down function. This
function ensures that the engine and turbocharger properly cool down by maintaining engine operation for
a user-defined duration.
This cool down function is initiated for any one of the following conditions:
•
Genset load is removed and engine shutdown is permitted while in AUTO mode
•
Auto Transfer switch (ATS) opens while operating in AUTO mode
•
Remote shutdown is initiated while in AUTO mode
•
Off Mode Cool down is initiated
•
Cool down Request logic element is initiated
•
Cool and Stop Request logic element is initiated
Smart Cool Down Function
The smart cool down function reduces unnecessary fuel expenditure by considering overall cool down
time through multiple requests. For example, a new cool down request is initiated after a previous cool
down sequence has already started. The cool down timer is not simply reset with each new request.
Instead, the amount of time that the engine has spent cooling down is factored into the new request. This
saves time and fuel by running the engine no longer than necessary to achieve proper cool down.
Automatic Restart Settings
BESTCOMSPlus Navigation Path: Settings Explorer, System Parameters, Automatic Restart
Front Panel Navigation Path: Settings > System Parameters > Auto Restart
When enabled, the Automatic Restart clears all alarms automatically if the DGC-2020HD shuts down due
to an alarm condition. An attempt to restart the engine is made, after a predetermined time delay, if the
ATS contact input is closed. If an ATS contact is not present, the unit remains in the READY state with
alarms cleared. A restart is not attempted if a low fuel alarm or emergency stop is present. The number of
restart attempts is programmable. Automatic restart attempts are recorded in the event log.
Auto Restart Interval accepts values from 0.5 to 30 minutes, in increments of 0.5 minutes. The Auto
Restart Attempts setting accepts values from 1 to 10, in increments of 1.
The BESTCOMSPlus Automatic Restart screen is illustrated in Figure 172.
DGC-2020HD Configuration