Winco DGC-500 - Manual (Page 46)

DGC-500 Functional Description 3-26
Figure 3-15. Normal Program Control Diagram
Figure 3-16. ECU Power Support Program Control Diagram
NOTE
ECU power support is not a selectable option. The DGC-500 will decide between
using the fuel solenoid output relay or controlling the fuel to provide ECU power
support. This is derived through the following method.
After the Pulse Cycle timer expires, the DGC-500 checks to see if ECU
communication is active. If so, then the DGC-500 will not pulse the ECU. The
same goes for Connecting, except the DGC-500 remembers if it skipped the
Connecting state. If it did, then it will also skip the Engine Shutting Down state
when the DGC-500 stops the engine.
ECU Power Support Program Control
If an engine has an ECU, then ECU support should be enabled so that the DGC-500 uses sender data
transmitted from the ECU over the J1939 interface. If the engine can be shut down only by powering off the
ECU, then the genset will need ECU power support enabled. An engine with ECU support enabled and a need
for ECU power support through the fuel solenoid will follow the ECU power support diagram of Figure 3-16.
Initial State - Power Up/Reset
This state begins after cycling power to the DGC-500, or after a software reset (i.e. a watchdog timeout) has
occurred. The unit will stay in reset for a short time. During this time, the firmware version number appears
on the front panel LCD and the DGC-500 averages out enough data counts to calculate accurate analog data.
During the Power Up/Reset state, if the previous system configuration was Run or Auto-Run with the ATS
closed and ECU support enabled, the fuel solenoid will close. This works to keep the engine running if the unit
temporarily losses power, and to gather engine speed data from the ECU to determine if it should go to Off
or stay in Run.