Deif SGC 420 User Manual (English)

Questions and Answers:

J
Jennifer HodgesSep 6, 2025
Why Deif SGC 420 does not stop the engine when a Remote stop command is sent?
- A
  Alexis BrewerSep 6, 2025
  If the Deif Controller does not stop the engine when a Remote stop command is sent from an external device, check the wiring of the Remote stop signal to the controller's respective digital input terminal. Enter the Configuration mode in the controller and verify the configuration for the Remote stop digital input terminal. Also, check that the controller is in Auto mode.
J
juliewilkinsonSep 5, 2025
What to do if Deif SGC 420 shows incorrect mains voltage or incorrect main alternator voltage?
- J
  Jennifer WebbSep 5, 2025
  If the Deif Controller shows incorrect mains voltage or incorrect main alternator voltage, check the wiring of the respective phase to the controller.
B
Barbara CarterSep 4, 2025
How to fix incorrect engine RPM on Deif Controller?
- N
  noahnewmanSep 4, 2025
  If the Deif Controller shows an incorrect engine RPM, check the wiring of the main alternator’s L1-phase and neutral to the controller.
D
David JohnsonAug 23, 2025
Why does Deif SGC 420 Controller generate unnecessary Shutdown alarms or Warning alarms?
- P
  Patrick MartinezAug 23, 2025
  If the Deif Controller generates unnecessary Shutdown or Warning alarms, check the respective switch, sensor, and wiring. Also, enter the Configuration mode in the controller and verify the respective threshold configuration.
M
Melanie SaundersSep 2, 2025
What should I do if the engine runs, but the Deif Controller shows genset to be OFF?
- A
  Aaron CampbellSep 2, 2025
  If the engine runs, but the Deif Controller shows the genset to be OFF, check if the alternator voltage signal (L1 phase) is received by the controller terminal. Also, check if the LOP and LLOP are working OK, and verify the wiring to the controller.
M
mwilliamsSep 1, 2025
What to check if Deif SGC 420 shows incorrect PF value or kW or load current?
- A
  Angel MartinSep 1, 2025
  If the Deif Controller shows incorrect PF value, kW, or load current, check the wiring of the respective alternator phase voltage and the CT to the controller. Also, check the CT ratio if the kW or current reading is faulty.
M
mejiakeithAug 31, 2025
How to resolve Error C03 on Deif SGC 420?
- Z
  zmorganAug 31, 2025
  Error C03 on the Deif Controller can occur if the controller is disconnected from the PC during a configuration. To resolve this: 1. Press and hold the Stop/Config button during a power cycle to reset the controller. 2. Re-send the configuration file.
L
Lawrence AllisonAug 30, 2025
Why Deif SGC 420 Controller sends a Crank-start command immediately after power on?
- X
  xpattersonAug 30, 2025
  If the Deif Controller sends a Crank-start command immediately after power on, ensure that the controller's output terminal is not directly connected to the starter relay. The controller's output should be given to an intermediate relay which should in-turn power the starter relay. Check start-relay connection with the suitable controller terminal.
D
david15Aug 29, 2025
How to fix Deif Controller showing genset is ON while the genset is stopped?
- M
  Mason DunnAug 29, 2025
  If the Deif Controller shows the genset is ON while the genset is stopped, enter the Configuration mode in the controller and verify the configuration for the LLOP and LOP. Check the wiring. Ensure that the mains voltage wiring is not connected by mistake to the controller's genset voltage terminals.
D
David GarciaAug 28, 2025
What to do if Deif SGC 420 Controller fails to crank-start the engine?
- M
  mcculloughkathleenAug 29, 2025
  If the Deif Controller fails to crank-start the engine, you can try the following: * Check the battery voltage. * Enter the Configuration mode in the controller and verify the configuration for the Start output. * Check that the Start output is working correctly by measuring its output voltage. * Enter the Configuration mode in the controller and verify the configuration of the Crank disconnect method. * Verify the configuration of the LLOP Switch polarity. * Ensure that the lube oil pressure switch and sensor are working OK, and check their wiring.

Deif SGC 420 Specifications

General

Storage temperature	-40°C to +85°C
Protection	IP20
Protection Class	IP20
Input Voltage	100 to 690 V AC
Communication	RS485, Ethernet
Dimensions	144 x 144 x 35 mm

Summary

Introduction

About SGC 420/421

General information about DEIF's SGC 420/421 genset controllers.

Key functions

Overview of the main features and capabilities of the SGC 420/421 controllers.

Product overview

Summary of the SGC 420/421 controller's features and specifications.

Passwords

Controller Buttons

Overview of controller buttons

Description and identification of the physical buttons on the controller.

Legal Information

Contains warranty, disclaimer, and copyright information.

Safety Instructions

General Safety Instructions

General guidelines and warnings for safe installation and maintenance.

Electrical Safety

Specific safety precautions related to electrical hazards and shock prevention.

In Operation Safety

Safety measures to follow during the operation of the controller and genset.

Technical Specifications

Terminals

Details on the types and specifications of terminal blocks used in the SGC 420/421.

Power Supply

Specifications related to the controller's power supply requirements and operation.

Genset Voltage and Frequency Measurements

Technical details for measuring genset voltage and frequency.

Genset Current Measurements

Technical specifications for measuring genset current.

Earth Leakage/Fan Current Monitoring

Specifications for earth leakage and fan current monitoring.

Mains Voltage and Frequency Measurement

Technical details for measuring mains voltage and frequency.

Digital Inputs

Specifications and configuration options for digital inputs.

Analogue Resistive Sensor Inputs

Details on analogue inputs for resistive sensors, including range and accuracy.

Analogue Inputs Used as Digital Inputs

Wiring diagrams showing how analogue inputs can function as digital inputs.

Analogue Voltage/Current Input

Specifications for analogue voltage and current sensing inputs.

Site Battery Inputs

Details on inputs for site battery monitoring and run hours.

Magnetic Pick-up (MPU) Input

Specifications for the magnetic pick-up input used for engine speed sensing.

Digital Outputs

Specifications for the controller's digital output terminals.

Actuator Outputs (SGC 421 only)

Details on actuator outputs for electronic governing applications on SGC 421.

D+ Charger Alternator

Specifications for the D+ terminal used for charging alternator control and monitoring.

Sensor Common Point

Description of the sensor common point terminal for analogue sensors.

Communication Ports

Details on USB, RS-485, and CAN communication ports.

Installation

Dimensions

Physical dimensions of the controller and panel cut-out requirements.

Mounting in Panel

Instructions and illustrations for mounting the controller into a panel.

Terminal Details

Detailed description of each terminal on the rear of the controller.

Typical Wiring Diagrams

Illustrative wiring diagrams for the SGC 420 controller.

Monitoring Mode

Explanation of the monitoring mode and how display views shift.

Configuration Mode

Step-by-step guide to entering and navigating the controller's configuration mode.

Configurable Parameters

Overview of the parameters that can be configured on the controller.

Module

Configuration options related to the controller module settings.

Digital Inputs

Configuration options for digital inputs, including source, polarity, and action.

Analogue Inputs

Configuration details for analogue inputs, including sensor selection and calibration.

Outputs

Configuration of digital output sources and activation settings.

Timers

Configuration of various timers, including cranking and start/stop delays.

Generator

Configuration settings for the generator, including voltage and frequency monitoring.

Mains

Configuration for mains monitoring, including voltage, frequency, and phase reversal.

Engine

Configuration settings related to engine parameters and monitoring.

Maintenance

Settings related to maintenance alarms and due dates.

Password ID

Configuration of password IDs for controller access.

Rotary Actuator (SGC 421 only)

Configuration options specifically for the rotary actuator on SGC 421.

Digital Input Source Selection

Guide to selecting sources for digital inputs displayed on the controller.

Digital Output Source Selection

Guide to selecting sources for digital outputs.

Running Modes

Auto Mode

Detailed explanation of the Auto mode operation, including Site Battery Monitoring.

Manual Mode

How to operate the controller in Manual mode.

Start and Stop Sequences

Flowcharts and explanations of engine start and stop sequences.

Load Detection

Load Detection in Auto Mode

How the controller detects load in Auto mode using contactor outputs.

Load Detection in Manual Mode

Methods used by the controller to detect load in Manual mode.

Features

About Features

General information about controller features.

Auto Config Exit Mode

How the controller exits configuration mode automatically.

Load Histogram

Functionality for displaying engine running hours in load groups.

Alarms

Explanation of alarm types, actions, causes, and handling.

Modbus Communication Protocol

About the Modbus Communication Protocol

Introduction to the Modbus protocol used by the SGC 420.

Modbus Connection Details

Information on how to connect the controller for Modbus communication.

Modbus Functions

Supported Modbus functions and their descriptions.

Modbus Communication Settings

Configuration parameters for RS-485 Modbus communication.

Register Map (Function Code 03)

Mapping of registers for reading data using Modbus function code 03.

Register Map (Function Code 16)

Mapping of registers for writing data using Modbus function code 16.

Engine Communication

Introduction to Engine Communication

Overview of engine communication capabilities via CAN bus.

Default Settings

Information about default engine communication settings.

Supported Engines

List of engine manufacturers supported for J1939 communication.

Engine Values on the Display

How to configure the display to show ECU values.

Engine Communication Settings

Detailed steps for configuring engine communication using DEIF Smart Connect software.

Generic J1939

Information on using the generic J1939 protocol for engine communication.

CAN Communication

About the CAN Communication Protocol

Introduction to the CAN communication protocol supported by SGC 420/421.

CAN Communication Structure

Details on the structure of CAN communication data and commands.

CAN Packet Structure

Structure of command messages sent over CAN.

Troubleshooting

Common faults, their causes, and remedial actions for the controller.

Related product manuals

Deif SGC 420 User Manual

Table of Contents

Questions and Answers:

Deif SGC 420 Specifications

Summary

Introduction

About SGC 420/421

Key functions

Product overview

Passwords

Controller Buttons

Overview of controller buttons

Legal Information

Safety Instructions

General Safety Instructions

Electrical Safety

In Operation Safety

Technical Specifications

Terminals

Power Supply

Genset Voltage and Frequency Measurements

Genset Current Measurements

Earth Leakage/Fan Current Monitoring

Mains Voltage and Frequency Measurement

Digital Inputs

Analogue Resistive Sensor Inputs

Analogue Inputs Used as Digital Inputs

Analogue Voltage/Current Input

Site Battery Inputs

Magnetic Pick-up (MPU) Input

Digital Outputs

Actuator Outputs (SGC 421 only)

D+ Charger Alternator

Sensor Common Point

Communication Ports

Installation

Dimensions

Mounting in Panel

Terminal Details

Typical Wiring Diagrams

Monitoring Mode

Monitoring Mode

Configuration Mode

Configuration Mode

Configurable Parameters

Module

Digital Inputs

Analogue Inputs

Outputs

Timers

Generator

Mains

Engine

Maintenance

Password ID

Rotary Actuator (SGC 421 only)

Digital Input Source Selection

Digital Output Source Selection

Running Modes

Auto Mode

Manual Mode

Start and Stop Sequences

Load Detection

Load Detection in Auto Mode

Load Detection in Manual Mode

Features

About Features

Auto Config Exit Mode

Load Histogram

Alarms

Alarms

Modbus Communication Protocol

About the Modbus Communication Protocol

Modbus Connection Details

Modbus Functions

Modbus Communication Settings

Modbus Communication Settings

Register Map (Function Code 03)

Register Map (Function Code 16)

Engine Communication