Basler Electric DGC-2020ES - Manual (Page 51)

9469200990 Rev C 43
Contact Outputs
Output contact operation is controlled by the operating mode of the DGC-2020ES. The state of the
Emergency Stop contact input also affects output contact operation. When the Emergency Stop contact
input is open (emergency stop condition), the PRESTART, START, and RUN outputs open and an
emergency stop alarm is annunciated. When the Emergency Stop input is closed, all output contacts
operate normally.
DGC-2020ES output contacts include PRESTART, START, RUN, and four programmable outputs.
Additional output contacts can be accommodated with an optional CEM-2020 (Contact Expansion
Module).
Prestart
This output closes to energize the engine glow plugs or run pre-lubrication pumps. The PRESTART
output can be programmed to close up to 30 seconds prior to engine cranking. The PRESTART output
can also be programmed to open upon engine startup or remain closed as long as the engine is
operating.
During the resting state, the PRESTART output can be set to Off, On, or Preheat Before Crank. If Preheat
Before Crank is selected, the PRESTART 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 PRESTART output will be closed for the entire rest time.
PRESTART output connections are made through terminals located on the PRESTART relay.
Start
This output closes when engine cranking is initiated by the DGC-2020ES and opens when the magnetic
pickup (MPU) or generator frequency indicates that the engine has started. Prior to engine starting, the
duration of cranking is determined by the cranking style (cycle or continuous) selected. Cycle cranking
permits up to seven crank cycles with crank cycle duration of 5 to 15 seconds. The continuous crank time
is adjustable from 5 to 60 seconds.
START output connections are made through terminals located on the START relay.
Run
This output closes when engine cranking is initiated by the DGC-2020ES. The RUN output remains
closed until it receives a command to stop the engine.
RUN output connections are made through terminals located on the RUN relay.
Relay Control
In some applications, it may be beneficial to modify the standard operation of the DGC-2020ES Run, Pre-
Start, or Start relays. If desired, these relays can be configured to operate outside their predefined
functionality. For example, if your genset does not require starting assistance from glow plugs, the Pre-
Start relay may be assigned for another purpose. Configuring these relays as programmable makes them
available in BESTlogic
™Plus programmable logic to be used in the same manner as the other
programmable relay outputs. Predefined or programmable operation of the Run, Pre-Start, and Start
relays is selected on the Relay Control screen (Figure 14). See the BESTlogicPlus chapter for more
information about DGC-2020ES programmable logic.
The Relay Control screen is found in the BESTCOMSPlus
® Settings Explorer under the System
Parameters category. If using the front panel, navigate to Settings > System Parameters > Relay Control.
DGC-2020ES Contact Outputs