Atlas Copco LT40 User Manual

Atlas Copco Stationary Air Compressors
*2920125704*
No. 2920 1257 04
Registration code: APC L / 38 / 989
Replaces 2920 1257 03
2000-10
LE/LT15, -22, -40, -55, -75, -110, -150
LF15, -22, -40, -55, -75
www.atlascopco.com
• Copyright 2000, Atlas Copco Airpower n.v., Antwerp, Belgium.
Any unauthorized use or copying of the contents or any part thereof is prohibited. This applies in
particular to trademarks, model denominations, part numbers and drawings.
• This instruction book meets the requirements for instructions specified by the machinery directive
98/37/EC and is valid for CE as well as non-CE labelled machines.
Instruction Book

Atlas Copco LT40 Specifications

General

Brand	Atlas Copco
Model	LT40
Category	Air Compressor
Language	English

Summary

1 Leading particulars

2 Installation and handling

2.1 Dimension drawings

Provides dimensional drawings for various compressor power pack and complete unit models.

2.2 Installation proposals

Provides guidelines for installing compressors in various configurations.

2.3 Electrical connections

Details the requirements for electrical installation and connections.

2.4 Settings of overload relay - fuses - cable size

2.4.1 Settings of overload relay - fuses of compressors with DOL starter

Provides overload relay and fuse settings for DOL starter compressors.

2.4.2 Settings of overload relay - fuses of compressors with Y-D starter

Provides overload relay and fuse settings for Y-D starter compressors.

3 Operating instructions

Safety precautions

General safety precautions for operating the compressor.

3.1 Initial start-up

Step-by-step guide for the initial start-up of the compressor.

3.2 Starting

Instructions for starting LE/LF/LT and LE/LF/LT Trolley compressors.

3.3 Stopping

Procedures for stopping LE/LF/LT and LE/LF/LT Trolley compressors.

4 Maintenance

4.2 Preventive maintenance schedule for the compressor

Provides a schedule for preventive maintenance tasks based on running hours.

5 Servicing and adjustment procedures

5.1 Unloader or check valve

Discusses valve maintenance due to dirt, condensate, or oxidation, and replacement recommendations.

5.2 Valves

Describes how to identify faulty valves and recommends replacing valve discs, O-rings, and joints.

5.3 Air filter

Instructions for cleaning and replacing the air filter element for different compressor models.

5.4 Adjustment MDR4 pressure switch

Details how to adjust the maximum pressure and pressure difference on the MDR4 pressure switch.

5.5 Adjustment MDR5/6 pressure switch

Explains the adjustment of maximum and pressure difference on the MDR5/6 pressure switch.

5.6 Adjustment pilot valve on Trolley

Describes how to adjust the maximum or unloading pressure using the pilot valve on Trolley units.

5.7 Safety valve (SV-Figs. 1.4, 1.5 and 1.8)

Instructions for testing and replacing the safety valve if it doesn't open correctly.

5.8 Relief valve (8-Fig. 1.1) on LF55/75, LE75 up to -150 and LT

6 Problem solving

1 Insufficient air pressure

2 Unit does not speed up

3 Air receiver pressure rises above maximum and causes safety valve to blow

4 Relief valve blows

5 Receiver does not hold pressure

6 Too frequent starting/too short operating periods

7 High oil consumption on LE/LT compressors

8 Unit does not start

9 Overload relay cuts out