SECTION 3
FUNCTIONAL DESCRIPTION
TABLE OF CONTENTS
SECTION 3 • FUNCTIONAL DESCRIPTION ........................................................................................... 3-1
INTRODUCTION.................................................................................................................................... 3-1
DGC-500 FUNCTION BLOCKS ............................................................................................................. 3-1
Power Supply ..................................................................................................................................... 3-1
Microprocessor ................................................................................................................................... 3-1
Voltage Sensing Inputs ...................................................................................................................... 3-2
Current Sensing Inputs ....................................................................................................................... 3-2
Transducer Inputs .............................................................................................................................. 3-2
Speed Signal Inputs ........................................................................................................................... 3-3
Contact Input Circuitry ........................................................................................................................ 3-3
Front Panel HMI ................................................................................................................................. 3-3
Remote Display Panel ........................................................................................................................ 3-4
RS-232 Communication Port.............................................................................................................. 3-4
SAE J1939 Interface (Optional).......................................................................................................... 3-4
Horn Output ........................................................................................................................................ 3-7
Output Contacts ................................................................................................................................. 3-7
SOFTWARE OPERATION .................................................................................................................... 3-8
Power-Up Sequence .......................................................................................................................... 3-8
Cranking ............................................................................................................................................. 3-8
Pre-Alarms.......................................................................................................................................... 3-9
Alarms .............................................................................................................................................. 3-10
Real-Time Clock ............................................................................................................................... 3-11
Generator Run Statistics .................................................................................................................. 3-12
Event Log ......................................................................................................................................... 3-12
Generator Protection ........................................................................................................................ 3-12
DISPLAY OPERATION ........................................................................................................................ 3-14
Normal Mode .................................................................................................................................... 3-14
Alternate Mode ................................................................................................................................. 3-14
ECU Parameters Mode .................................................................................................................... 3-16
Menu Mode....................................................................................................................................... 3-19
Sleep Mode ...................................................................................................................................... 3-20
Changing Settings ............................................................................................................................ 3-25
Setting the Real-Time Clock at the Front Panel ............................................................................... 3-25
Key Code .......................................................................................................................................... 3-25
Front Panel Adjustable Parameters ................................................................................................. 3-26
ENGINE CONTROL UNIT (ECU) SUPPORT ...................................................................................... 3-26
Enabling ECU Support ..................................................................................................................... 3-26
ECU Constraints ............................................................................................................................... 3-26
Alarms and Pre-Alarms .................................................................................................................... 3-27
Fuel Solenoid Relay ......................................................................................................................... 3-27
Display Values (ECU Support Enabled) ........................................................................................... 3-27
ECUs with an External Fuel Solenoid .............................................................................................. 3-28
STATE MACHINES ............................................................................................................................. 3-28
System Configuration ....................................................................................................................... 3-28
Operating States .............................................................................................................................. 3-28
State Transitions .............................................................................................................................. 3-29
Normal Program Control .................................................................................................................. 3-29
ECU Power Support Program Control ............................................................................................. 3-29
Initial State - Power Up/Reset .......................................................................................................... 3-30
Ready State ...................................................................................................................................... 3-31
Pulsing State .................................................................................................................................... 3-32
Connecting State .............................................................................................................................. 3-32
Pre-Start State .................................................................................................................................. 3-32
Cranking State .................................................................................................................................. 3-33
Resting State .................................................................................................................................... 3-33
9355400990 Rev H DGC-500 Functional Description i
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