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1. Introduction
1.1
About
The SGC 421 controller contains all the functions needed to protect and control the genset, the genset breaker, and a mains
breaker. The values and alarms are shown on the LCD display screen, and operators can control the system from the
display.
You can use the SGC 421 to monitor the site battery and significantly reduce your fuel consumption. The controller can also
be used to monitor the shelter temperature, engine and alternator parameters, and the true RMS voltage and current.
The controller can do electronic governing for engines with mechanical fuel systems when you have installed a rotary
actuator.
1.2
Function overview
This is an overview of the most important functions.
Monitoring
Use the SGC controller to monitor the site battery and the shelter temperature. The controller can also monitor the mains,
and engine and alternator parameters.
Inputs and outputs
• Analogue current/voltage inputs
• Analogue resistive inputs
• Differential input for site battery voltage
• Digital switch input
• DG alternator input
• Mains voltage input (AMF)
• Input for fuel reference selection
• Digital outputs
Communication
• RS-485 for Modbus communication
• CAN bus engine communication
• USB interface to PC
Modes of operation
The SGC controller can operate in AUTO mode, manual mode, and test mode.
In AUTO mode, you can select these functions:
• Island
• Site battery monitoring
• Automatic mains failure (AMF)
• Cyclic mode
• Remote start/stop
• Auto exercise
• Engine drive
Display and language functions
• Backlit display
• Supports many languages, including English, Spanish, and Chinese
User manual 4189341355A EN
Page 5 of 92
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