Atlas Copco LT20/30

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Instruction book

Example: LE

Stopping pressure: 7 bar(e)

Starting pressure: adjustable between 3 and 5.7 bar(e)

Fig. 5.6 Pressure difference diagrams, MDR4S/11 bar and MDR4S/25 bar

2920 1585 00 - 58 -

Main Page

Table of Contents3
Leading Particulars5
General Description5
Compressor Variants8
Air Flow9
LE/LF2 up to -5, LE7 and LE10 50 Hz (Fig. 1.10)9
LE10 60 Hz, LE15, -20, LF7, -10 and LT (Fig. 1.11)9
Regulating System12
LE/LF/LT2 up to -7 with DOL Starter (Fig. 1.10)12
LE/LT5 up to -20, LF5 up to -10, each with Y/D Starter (Fig. 1.11)12
LE/LF/LT Trolley (Fig. 1.12)13
Installation and Handling15
Dimension Drawings15
Installation Proposals36
Le/Lf/Lt38
LE/LF/LT Trolley39
Electrical Connections39
Settings of Overload Relay - Fuses - Cable Size43
Settings of Overload Relay - Fuses of Compressors with DOL Starter43
Settings of Overload Relay - Fuses of Compressors with Y-D Starter44
Cable Size45
Pictographs46
Operating Instructions47
Initial Start-Up47
Starting47
Stopping48
Taking out of Operation at End of Compressor Service Life49
Maintenance50
Petrol Engine Maintenance50
Preventive Maintenance Schedule of the Compressor 1)50
Lubrication of LE/LT Compressors51
Service Kits51
Servicing and Adjustment Procedures53
Unloader or Check Valve53
Valves53
Replacement of Valve Discs (Figs. 5.1 and 5.2)55
Air Filter56
Adjustment of MDR4S Pressure Switch (Figs. 5.4 up to 5.6)57
Adjustment of MDR3 Pressure Switch (Figs. 5.7 and 5.8)59
Adjustment of Pilot Valve on Trolley (Fig. 5.9)60
Safety Valve (SV-Figs. 1.4, 1.6 and 1.8) 1)61
Testing on LE/LF/LT61
Testing on LE/LF/LT Trolley61
Relief Valve (8-Fig. 1.1) on LF7, -10, LE10 up to -20 and LT61
Problem Solving62
Principal Data64
Reference Conditions64
Limitations64
Compressor Data for LE 10 Bar64
50 Hz64
60 Hz65
Compressor Data for LF 10 Bar66
50 Hz66
Compressor Data for LT 15 Bar67
50 Hz67
60 Hz67
Compressor Data for LT 20 Bar68
50 Hz68
Compressor Data for LT 30 Bar69
50 Hz69
Conversion List of si Units into Us/British Units70
PED (Pressure Equipment Directive)70
Components Subject to 97/23/EC Pressure Equipment Directive70
Overall Rating70

Atlas Copco LT20/30

Table of Contents

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