SG+ Controller Description

The SG+ controller is a two-piece, self contained microprocessor for diesel generator sets. The SG+ display is mounted on the control box cover. The SG+ microprocessor is mounted inside the control box. Three external relays - two ECU Relays and the Start Relay are also mounted inside the control box near the microprocessor. Another Relay - the Preheat Relay, is located in the Engine Compartment.

This system automatically controls generator operation by providing:

  • Automatic unit preheat and engine startup during initial startup or delayed restart

  • Variable glow plug preheat time

  • Automatic Pretrip Test capability

  • Delayed alternator excitation for 2 minutes

  • Unit shutdown protection for the engine and alternator. The controller stops the unit due to low engine oil pressure, low engine oil level, high coolant temperature, or alternator overload.

  • Automatic unit restart 20 minutes after unit shutdown due to an unknown condition, high engine water temperature, engine failure to start, check fuel alarm, or alternator overload (also low engine oil pressure if enabled). It will attempt three (3) restarts and then stop.

    SG+ Controller Display

Parent topic: SG+ Controller and Operating Instructions

Microprocessor

SG+ Microprocessor

1. J6 Connector – To AC Circuits 10. 2C Circuit Connection
2. Fuse SI1 – 30 Amp Fuse Power Relay 11. 8 Circuit Connection
3. Fuse SI2 – 30 Amp Protects Battery Charger Output Circuit 12. Fuse SI3 – 10 Amp Protects Microprocessor Power Input Circuit
4. 2A Circuit Connection 13. J4 Connector – To External Relay Circuits
5. CH Circuit Connection 14. RL1 – Ignition Relay
6. GND Circuit Connection 15. RL2 – Run Relay
7. Serial Port – For Flash Loading Software 16. RL3 - Fuel Pump Relay
8. J2 Connector – To SG+ Controller Display 17. J1 Connector – To Sensor and Fuel Solenoid Circuits
9. J20 - Connector to CAN    

Controller Overview

1. Display A vacuum lucent display on the front panel shows operating information including output voltage, current test state during a Pretrip test and the controller menu. Normally it shows the Output Voltage (this is called the Standard Display). It will be blank when the unit On/Off switch is OFF.
2. Escape Key Press this key to escape a new setting or jump to the parent menu.
3. Up Key Press this key to scroll UP through the menu display, or increase the value of a setting.
4. Down Key Press this key to scroll DOWN through the menu display, or decrease the value of a setting.
5. Enter Key Press this key to enter or execute controller menu tasks or commands.
6. Alarm Key Press this key to go directly to the Alarm List Menu and view the alarm information in the display.
7. Alarm LED Flashes when the controller has detected an alarm condition. It is off when there are no alarms.
8. Power LED Lights up while the Unit On/Off Switch is in the ON position. It is off when the Unit On/Off Switch is in the OFF position.
9. Language Key Press this key to change the language used on the display. English and Spanish are the languages that are currently available.
10. Download Port Is used to download the event logger and flash load new software.
11. Unit ON / OFF Switch In the ON position, the electrical control system energizes for unit operation. In the OFF position, the electrical control system including the fuel solenoid de-energizes to stop the engine. The unit will not operate.

Miscellaneous Controller Features

  • Internal self-checking/diagnostic capability

  • Pretrip test capability

  • Hourmeter: The controller has a built-in run hourmeter that can be accessed through the Timers/Counters Submenu under the Misc. Functions Menu.

  • The application software version is displayed by selecting the Program Version Submenu under the Misc. Functions Menu.

  • Display menus: The SG+ controller contains extensive display menus that can be navigated via the keypad. The display menus are organized into seven Main Menus: Data Menu, Alarm List Menu, Warning List Menu, Commands Menu, Misc. Functions Menu, Configuration Menu, and Event Log Menu.

Microprocessor Inputs:

  • Alternator Voltage

  • Battery Voltage

  • Coolant Level Sensor

  • Ignition Relay Feedback

  • Run Relay Feedback

  • Fuel Sender (Optional)

Microprocessor Outputs:

  • Start Relay

  • Ignition Relay

  • Run Relay

  • On Light

  • Alarm Light

  • Fuel Pump

  • Quad Relay