Grant OPTIMA RANGE GD120 User Manual

IN THE LABORATORY
SERVICE MANUAL
for the OPTIMA RANGE
GENERAL PURPOSE TEMPERATURE
CONTROLLER GD100 & GD120
Part No. 17592/Issue 1 July 2002

Grant OPTIMA RANGE GD120 Specifications

General

Control Algorithm	PID
Input Type	PT100
Output Type	Relay
Display	LCD
Power Supply	230V

Summary

Introduction to Grant GD100/GD120 Controllers

Electrical Safety Precautions

Details safety requirements for electrical connections, compliance with IEC61010, and earth connections.

AC Power Supply Connection

Instructions for connecting the unit to AC power, including voltage versions and fuse details.

Fault Finding Procedures

Initial Tests for Fault Diagnosis

Outlines basic tests to perform before diagnosing specific faults in the unit.

Fault Diagnosis Steps

Provides general steps and guidance for diagnosing unit faults.

Display and Temperature Fault Flowcharts

Troubleshooting flowcharts for common display and temperature-related issues.

Motor and Heater Fault Flowcharts

Troubleshooting flowcharts for motor and heater malfunctions.

Removal and Access Procedures

Removal of the Outer Cover

Front Panel Assembly Removal

Display PCB Removal

PSU PCB Removal

Heater Component Removal

Temperature Probe Removal

Float Switch Component Removal

Float and Float Shaft Removal

GD120 Motor Removal

GD100 Motor Removal

Over-temperature Cut-out Replacement (GD120)

Setting Up and Testing Procedures

Functional Test Execution

Setting Up the DAC Output

Heater Control Verification

Temperature Calibration Process

Detailed procedure for calibrating the temperature controller for accurate readings.

Storing Calibration Figures

Accuracy Check Procedure

Procedure to verify the accuracy of the unit's indicated temperature against an external thermometer.

Electrical Safety Tests

Earth Bonding Test Procedure

Procedure to test the integrity of the earth bonding connection.

Insulation Resistance Test

Test to measure the insulation resistance between earth and live/neutral pins.

Final Inspection Checklist

List of Spare Parts