Basler Electric DGC-2020HD - Manual (Page 81)

9469300990 Rev B 71
Contact Outputs
DGC-2020HD output contacts include PRE (Prestart), START, RUN, and 12 programmable outputs.
Additional output contacts can be accommodated with up to four optional CEM-2020s (Contact Expansion
Modules).
Output contact operation is controlled by the operating mode of the DGC-2020HD. 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.
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 prior to
re-entering the cranking state. If the Pre-crank delay is set 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. See the Terminals
and Connectors chapter for the location of the Prestart relay on the rear panel of the DGC-2020HD.
Start
This output closes when engine cranking is initiated by the DGC-2020HD 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 each crank cycle having a 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. See the Terminals and
Connectors chapter for the location of the Start relay on the rear panel of the DGC-2020HD.
Run
This output closes when engine cranking is initiated by the DGC-2020HD. 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. See the Terminals and
Connectors chapter for the location of the Run relay on the rear panel of the DGC-2020HD.
Relay Control
BESTCOMSPlus ® Navigation Path: Settings Explorer, System Parameters, Relay Control
Front Panel Navigation Path: Settings > System Parameters > Relay Control
In some applications, it may be beneficial to modify the standard operation of the DGC-2020HD Run,
Prestart, 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
Prestart relay may be assigned for another task. 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, Prestart, and Start relays
DGC-2020HD Contact Outputs