ELTRA CS-800 - Page 40

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Due to high voltage in the range of 7000 Volts (amplitude), there should be no

measurement on the rectifier under power. If no spare rectifier available to

exchange, then test by using a scope according to the following drawing.

Fig. 19: Rectifier

220 VAC

Insulating

transformer

220 VAC

Adjustable

transformer

Rectifier

about

4000 Ω

Main Page

Table of Contents4
Notes on the Service Manual8
Modification Overview9
Up to S/N 0766Xxxxxx9
From S/N 0767Xxxxxx to 0950Xxxxxx13
From S/N 0951Xxxxxx to 1079Xxxxxx15
From S/N 1080 XXXX to 1556Xxxxx20
From S/N 1557Xxxxxx25
New Pneumatics (from End 2007)26
Fault Messages27
Check Base Lines27
Fluctuating Gas Flow28
Blocked Metal Dust Filter29
Blocked Chemicals29
Blocked Paper Filters30
Blocked Lance Hole over the Crucible30
Blocked Furnace Outlet30
Too Low Oxygen Pressure30
Outlet Tap of the Oxygen Regulator Is Not Properly Open30
Contaminated or Corroded Solenoid Valve30
Faulty Oxygen Regulator30
Bent Plastic Tube of Oxygen Supply30
Heavy Item Is Placed on the Plastic Tube of the Oxygen Supply31
Twisted Plastic Tube Inside the Analyzer31
Oxygen Supply Is Interchanged with the Compressed Air Supply31
Blocked Dust Filter Cartridge31
Blocked Fittings31
Blocked Flow Sensor Assembly31
Electronic Problem31
High Carbon Results Are Erratic32
No Combustion33
No Oxygen Pressure33
No Flow34
Pre-Purging34
Waiting for Stability34
Integration Delay35
Analyzing35
The Command from the Microcontroller to Start the Generator Is Not Received35
Measurements on TP935
Checking the Generator Tube36
If the Filament of the Generator Tube Doesn't Glow37
Checking the Primary Voltage on the High Voltage Transformer38
The Rectifier Could also be Faulty39
Loud Buzzing Sound When the Generator Turns on42
Bad Combustion42
Electronic- Drivers Malfunctioning43
Furnace Does Not Close45
Analysis Takes too Long46
Additional Reasons for Excessive Analysis Duration Could be47
One of the IR-Sources Is Unstable47
Development of Dust When Closing the Furnace50
Irregular Results50
The Results Are Always 0.0000% or 00.0Ppm51
Combustion Tube - Life Time Is too Short51
IR-Cell Temperature Control Is out of Range53
Breaker Turns off at the Beginning of Combustion53
Further Causes Could be Found in the Oscillator Circuit55
Breaker Turns off at the End of the Analysis57
Furnace - Large Collection of Dust When Opening58
No or Low Oxygen Pressure59
Possible Faults on the Front Panel of the Analyzer59
On the Rear-Side of the Analyzer60
Inside the Analyzer60
3.17.3.1 Oxygen Solenoid Valve (V5) May be Defective60
3.17.3.2 Outflow Valve Does Not Close61
3.17.3.3 if the Voltage on the Outflow Valve Is Constantly at 24 V, then61
Other Faults61
No Oxygen Flow61
Status Window Message: "Waiting for Stability61
Reasons for Instability62
3.19.1.1 too Low Deviation Value62
3.19.1.2 too High Noise62
3.19.1.3 too High Drift62
Furnace Opens with Delay after the End of Analysis62
Oxygen Pressure Falls When the Furnace Opens64
Combustion Without Starting Analysis65
Crucible Cracks or Melts68
Analysis Doesn't Start / no Peak on Screen68
Vibrations on Setting 268
Analysis Cycle Stops before the Peak Begins69
Chopper Motor Doesn't Rotate70
Sample Burns but no Peak on the Screen70
IR Signal Does Not Come down to the Base Line at the End of Analysis70
Too Long Combustion of a very Low Carbon Sample71
Copper Oxide Has a Bad Quality72
Path Window Is Not Sealed or It Is Broken72
Flow Stops During Analysis73
Adjustments, Tests and Working Instructions74
Gas Flow Controller Adjustment and Jumper Settings74
Jumper Settings75
Gas Flow Regulation76
Infrared Base Line Adjustments78
Infrared Cell Modification - General Information78
General Test Points81
Supply Voltages and Thermostatic Control Circuit81
Supply Voltages for IR Signal Processing Circuit81
Test Points IR-Ranges83
Supply Voltages for IR Signal Processing Circuit83
Outputs (Base Lines about 8VDC. for Golden Paths Adjust 6VDC)83
Base Line Adjustments84
Infrared Cell Board Irc1.X Sections Assignment84
Explanations84
Example84
Voltage of a Base Line Is too High (Higher than 9.5V)85
Source Voltage - Reducing85
Drift too Large86
IR Source Voltage Setting87
IR Cell Temperature Control88
Examples88
Modifications for Higher Sensitivity (Gain) in the Low Sulphur Range89
IRC Board and Cross-Talk89
Pneumatics90
Pneumatics Adjusting for Correct Furnace Movement92
Pressure Regulation93
Purge Pressure94
Closing Cone Adjustment96
Linearisation97
Balance Programming97
Induction Generator Control97
Service100
IR-Paths, Cleaning and Replacing100
Available Infrared Paths101
Infrared Electronics102
General Test Points103
Supply Voltages and Thermostatic Control Circuit103
Supply Voltages for IR Signal Processing Circuit103
IR-Channels Test Points104
Supply Voltages for IR Signal Processing Circuit104
Outputs (Base Lines about 8VDC. Less no Problem)104
Infrared Power Supply105
IR-Source106
Leak Checking108
Furnace Inlet System - Leaks111
Leaks in the Furnace111
Leaks in the Furnace Outlet System111
Leaks Inside the Analyzer111
Solenoid Valves Cleaning112
Flow Sensor - Replacing / Cleaning113
Flow Sensor Replacing113
Furnace Pneumatics - Additional Safety Features (Optional)114
Halogen Trap - Installing115
Gas Saving Mode115
Miscellaneous117
Ordering Numbers117
Infrared Cells118
Front Side120
Right Side122
Pneumatics124
Oscillating Circuit126
Furnace128
Furnace Cleaning130
Wiring (I)133
Uni 1143
Gas Flow System144
Valve Controlling146
Opening the Furnace147
Closing the Furnace147
Spare Parts Kits147
Common Spare Parts Kit for All Analysers147
Maintenance151
Index152

ELTRA CS-800 - Page 40

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