Basler Electric DGC-2020 - Manual (Page 145)

H Analog Expansion Module: Enable or Disable.
Crank Settings
The DGC-2020 can be programmed for either cycle or continuous engine cranking A . Cycle cranking
provides multiple engine starting attempts B . Each starting attempt consists of a fixed interval of engine
cranking C followed by a rest interval D . Continuous cranking E provides a single, extended engine-starting
attempt.
The DGC-2020 uses the engine speed signal (supplied by a magnetic pickup (MPU) or the generator
frequency) and the Crank Disconnect Limit setting
F to detect engine startup (and determine when engine
cranking can be stopped). The Crank Disconnect Limit setting is expressed as a percentage of the
nominal engine speed.
If desired, cycle or continuous cranking can be delayed after initiating engine startup. During this delay G ,
the Pre-Start output closes to energize the engine glow plugs or pre-start lubrication pump. The Pre-Start
output can be configured to open upon the conclusion of engine cranking or remain closed as long as the
engine is running
H .
The Pre-Start can be configured I 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
J 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
K , the starter will
be disconnected from the engine.
Engine Cooldown
After a genset’s load is removed, the DGC-2020 implements a smart cooldown function which ensures
proper engine and turbocharger cooldown by maintaining engine operation for a user-specified duration
L .
The cooldown time delay 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 Cooldown is initiated
•
The Cooldown Request logic element is initiated
•
The Cool and Stop Request logic element is initiated
Note that the DGC-2020 only goes through a cooldown sequence if the generator has supplied load (i.e.
there was enough current for the Supplying Load LED to illuminate on the front panel while the generator
was running) and one of the above conditions occurs to initiate the cooldown sequence. In addition,
cooldown can occur during normal running before any of the above conditions occur. If the engine was
loaded, then the load is removed during normal running and the cooldown timer begins timing since
cooldown is occurring due to the absence of load. If one of the above conditions occurs after the load has
been removed, there may be a shortened “normal” cooldown period since some cooling has already
occurred, or the cooldown may be skipped if the cooldown timer elapsed during normal engine running.
This reduces unnecessary fuel expenditure going through a cooldown cycle that is not required since
partial or complete cooldown has already occurred.
Off Mode Cooldown
When Off Mode Cooldown M is enabled, pressing the DGC-2020 front panel OFF button one time will
cause the unit to unload, open its breaker, and go through a cooldown cycle for the duration of the No
Load Cooldown Time
K . At the end of the cool down cycle, the unit will go to OFF mode. If it is desired to
stop the machine immediately, pressing the OFF button twice will cause the unit to go to OFF mode
immediately. Furthermore, if an Off Mode Cooldown is in progress and the OFF button is pressed, the unit
will immediately shut down. If the unit was in RUN mode when the OFF button was pressed, it remains in
RUN for the remainder of the cooldown cycle. If the machine was in the AUTO mode when the OFF
button was pressed, it remains in AUTO mode until the cooldown and shutdown cycle are completed, or
until the OFF button is pressed a second time forcing the unit to OFF mode. The OFF LED will flash to
9400200990 Rev X DGC-2020 BESTCOMSPlus
® Software
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