815_368.pdf

Operating Instructions

Electronic Levelling Module (ELM)

474 100 001 0

Operating Instructions

Electronic Levelling Module

ELM

474 100 001 0

Version: June 2001

Vehicle Control Systems

An American Standard Company

Changes are reserved.

ELM

Function

General

ELM and to put the system into opera-

tion, a remote control unit, like the one

employed in ECAS systems must be

used (preferably 446 056 116 0).

The Electronic Levelling Module (ELM)

474 100 001 0 was developed for com-

mercial vehicles – especially for Semi-

Trailers

An air suspension system equipped

with an ELM has functions superior to a

conventional air suspension system:

Module assemblies and interfaces

The following assemblies are integrated

into ELM:

• Control of ride height while the vehi-

cle is moving.

• Raising and lowering of the super-

structure while the vehicle is stand-

ing still via a control unit so that

loading and unloading operations

are made easier.

The following functions are also availa-

ble:

• A height sensor with lever for deter-

mining the distance between chassis

and axle.

• Electronics ...

... for monitoring and converting the

incoming height sensor signals

... to the desired value required by

energising solenoid valves and

from saved data (calibration lev-

els, memory levels).

• Regulation of the superstructure

height over the axle while the vehicle

is moving only in relatively long time

intervals (60 s), as consequence of

undesired disturbances.

• Automatic control in normal level,

and blocking of commands from the

remote control unit, when an input

speed limit has been exceeded (20

km/h).

• Control of any desired level in load-

ing and unloading mode, selected by

raising or lowering.

• Storing and requesting two pre-

ferred levels via the remote control

unit (memory function).

• Termination of height changes by

releasing the control button.

In order to fully utilise the capacity of the

• 2 solenoid valves for accentuating

the air suspension carrier bellows,

whereby a 3/2-way valve carries out

inflating and de-flating and a 2/2-way

valve blocks/opens the connections

to the connected air suspension bel-

lows.

ELM has 4 pneumatic and 2 electrical

connections and a mechanical connec-

tion. These mean individually:

• Pneumatic connection 1: inlet of the

pneumatic supply line from the air

reservoir to the air suspension sys-

tem.

• Pneumatic connection 2.1: output to

the air suspension bellows of the

right side of the vehicle.

Installation ELM

• Pneumatic connection 2.2: output to

the air suspension bellows on the left

side of the vehicle.

as well as output of information to an

info-master.

• Electrical connection 6.2 - ”REMOTE

CONTROL“: connection of the con-

trol unit cable.

• Pneumatic connection 3: Bellow

exhaust.

• Electrical connection 6.1 - ”POWER/

SIGNAL“: connection of cable com-

ing from VCS or EBS to the voltage

supply and to receive data (speed),

• Mechanical connection: connecting

rod from the axle to determining the

distance between axle - frame.

Installation

Installing onto vehicles

possible quick reaction times for the

system. The installation location for the

ELM must be selected so that the elec-

trical plug is pointing downward, to

avoid malfunctions due to humidity. The

two sites shown are permitted. The le-

ver is simply turned in the other direc-

tion:

The Electronic Levelling Module (ELM)

is installed onto the vehicle frame over

the axles. The installation location cor-

responds to that of the air suspension

valve in conventional air suspension

systems. Short pneumatic lines make

Preferred installation site

Alternative installation site

The maximum permitted tightening torque for the bolts, which are used to fasten

the ELM to the vehicle frame is 7 Nm.

ELM

Installation

Mechanical linking

based on the normal lever must be

±15°. Smaller linking areas are associ-

ated with unsuccessful calibration.

Optimum regulation is only possible

when the lever angle is completely

used.

The linking angle of the lever of the

ELM, based on the installation site, can-

not be more than ± 60° from the hori-

zontal, the lever of the ELM may have to

be lengthened so that the entire sus-

pension path of the vehicle is covered.

Short levers are associated with the risk

that the suspension path of the vehicle

is not completely covered and the per-

mitted measuring range is exceeded.

This can result in measurement inaccu-

racies in the final positions and even de-

struction of the ELM.

Lever lengths between the measuring

range of the ELM and the linking point of

rod fastened to the axle are recom-

mended between 150 to 300 mm. For

this purpose, the lever 441 050 718 2

should be used, which is fastened by

means of two bolts M6x16 and two self-

locking nuts to the lever of the ELM.

Longer lever lengths reduce utilisation

of the measured range. As the measur-

ing resolution worsens, repetition accu-

racy drops and the risk of swinging

increases.

60°

Permitted area

Lower level

Electrical supply

Finished, ready-for-use, sprayed cables

are used for the electrical supply to the

VCS or EBS. The ELM recognises the

connected system by means of which

pin the POWER/SIGNAL socket of the

supply voltage is on.

15°

Driving

level

15°

Permitted area

Upper level

For vehicles with VCS, a variant of the

Y- cable 449 354 … 0 is connected to

the diagnosis socket of the VCS elec-

tronics. The diagnosis socket for VCS is

on one of the outgoing lines, the ELM is

on the other. The pins of the 7-pole Bay-

onet socket are occupied as follows:

60°

short lever = small

suspension stroke

long lever = big

suspension stroke

The optimum lever length is horizontal

when the lever is in the normal level.

The minimum angle of the ELM lever

1. Terminal30

2. Terminal31

3. Ignition (signal ”terminal 15“ trans-

mitted via diagnosis line)

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: