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Contents
Page
2
6.1.2
Traction control T20R (LTM) ............................................................................................... 4
6.1.3
Accelerator T20R ................................................................................................................ 5
6.1.4
Progressive braking T20R................................................................................................... 6
6.2
T20S type 144 with LTM ...................................................................................................... 8
6.2.1
Location of electric components T20S type 144 (LTM) ....................................................... 9
6.2.2
Traction control T20S (LTM) .............................................................................................. 10
6.2.3
Progressive braking T20S ................................................................................................. 11
6.2.4
Accelerator T20S ............................................................................................................... 12
6.3
Presenting the LTM speed control ..................................................................................... 14
6.3.1
LTM power circuit .............................................................................................................. 15
6.3.2
Mosfet type power transistors 1V1 and 1V2 ..................................................................... 16
6.3.3
Transistors control with field effect .................................................................................... 17
6.3.4
Transistor conduction ........................................................................................................ 18
6.3.5
Transistor blocking ............................................................................................................ 19
6.3.6
Transistor protection module ............................................................................................. 20
6.3.7
Transistor module cabling.................................................................................................. 21
6.3.8
Installation of the transistor modules ................................................................................. 21
6.3.9
Transistor module checking .............................................................................................. 22
6.3.10
Power diodes ..................................................................................................................... 23
6.3.11
Measurement shunt ........................................................................................................... 23
6.3.12
LTM speed control ............................................................................................................. 25
6.4
LBC control module 1A2 .................................................................................................... 27
6.4.1
LBC control module check ................................................................................................ 29
6.5
Troubleshooting ................................................................................................................. 30
6.5.1
Analysis of faults ............................................................................................................... 30
6.6
Electric drawings for T20R - T20S with LTM ................................................................... 33
6.6.1
T20R with LTM - LBC - IES (1 start switch - brake end)
- until 10/97 - ................................................................................................................. 34-35
6.6.2
T20R with LTM - LBC - IES (2 brake pedals switches)
- from 11/97 to 05/98 - .................................................................................................. 38-39
6.6.3
T20S with LTM - LBC - IES
- until 10/97 - ................................................................................................................. 42-43
6.6.4
T20S with LTM - LBC - IES (new speed reduction ratios)
- from 11/97 to 05/98 - .................................................................................................. 46-47
Service Training
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