Winco DGC-2020 - Manual (Page 86)

selected, the Fuel Solenoid output will still close during cranking and genset operation to provide a
separate indication that the genset is running. For applications where pulsing of the ECU is not desired,
this pulsing feature
E may be disabled.
ECU Limitations
For some ECUs, an external source cannot stop the engine without removing power from the ECU.
Turning off power to the ECU is the only way to remove fuel from the engine and shut it down. Different
ECU manufacturers have their own rpm setpoints for reapplying fuel to an engine. If the ECU is powered
up and the engine is still spinning above 60 rpm, then the ECU will automatically turn the fuel on. Detroit
Diesel J1939 ECUs, for example, have a setpoint of 60 rpm.
Not being able to stop the engine without removing ECU power causes two problems. The first problem is
that the only way to stop the engine is to turn the ECU off and wait for the engine speed to decrease
below 60 rpm before powering the ECU back on. Otherwise, the engine will take off running. The second
problem is that while the ECU is off, you can no longer meter and update coolant level, coolant
temperature alarm/pre-alarm, and crank control.
The DGC-2020 Solution
The DGC-2020 resolves ECU limitations by using four timers:
 Engine Shutdown.
F The time in seconds to stay disconnected from the ECU when going from running
to shutdown before starting the first pulse. This timer should allow enough time for the engine to slow
down so that when the DGC-2020 pulses, the ECU will not start the engine.
 Pulse Cycle Time. G The time in minutes that the controller waits before pulsing.
 Settling Time. H The time in tenths of seconds to gather data after connecting to the ECU during the
pulsing state. This allows all the metered values to be sent and ramp as designated by the J1939
protocol. ECU values initially sent are low and the ECU takes time to average out its own data values.
 Response Timeout. I The time in seconds to attempt communication with the ECU when the DGC-
2020 is in the pulsing state or connecting state.
Figure 4-16. CANbus Setup
A Enable ECU Support: Check box to enable ECU support.
B Enable DTC Support: Check box to enable DTC support.
C CANbus Address: Accepts an address number from 0 to 253 in increments of 1.
D Output Select: Fuel Contact or Pre-start Contact.
E Pulsing: Enable or Disable.
F Engine Shutdown: Adjustable from 1 to 60 s in 1 s increments.
G Pulse Cycle Time: Adjustable from 1 to 60 s in 1 s increments.
H Settling Time: Adjustable from 5,500 to 30,000 ms in 1 ms increments.
I Response Timeout: Adjustable from 1 to 60 s in 1 s increments.
ECU Setup
The DGC-2020 can be configured for Standard, Volvo Penta , MTU MDEC, MTU ADEC, or MTU ECU7 A .
Configuring the DGC-2020 for Volvo Penta necessitates the configuration of two additional settings:
Speed Select and Accelerator Position. The Speed Select setting
B configures the Volvo Penta ECU to
operate the engine at the primary or secondary base speed. If the engine is configured by Volvo for 60 Hz
applications, the primary base speed is 1,800 rpm and the secondary base speed is 1,500 rpm. If the
engine is configured by Volvo for 50 Hz applications, the primary base speed is 1,500 rpm and the
4-16 DGC-2020 BESTCOMSPlus Software 9400200990 Rev K