Farmer 400
Fav 700
Fav 900
Power lift / EPC electrohydraulic power lift control
B031/B032 - draft-sensing pin, functional description
A
General
Fav 900 chassis number 23/3001 and up
19.04.2001
8610
000008
A
a
1/2
Capitel
Docu-No.
Index
Date
Version
Page
B031/B032 - draft-sensing pin, functional description
Text-module
PM-Picturemodule
Text-module
The draft-sensing pin is in the form of the bearing pin for the bottom links which can electrically detect
the forces in a given direction at the articulation point.
A transformer is mounted in a bore in the pin symmetrically to the shear plane of the bearing points to
measure the shear forces acting on the pin. Together with the pin enclosing it, this transformer forms a
magnetic circuit.
Text-module
The draft-sensing pin B031/B032 is fed with a 9.5 VDC supply voltage at contacts 1 (-) 3 (+).
The supply voltage is converted into an alternating voltage in draft-sensing pin B031/B032.
If draft-sensing pin B031/B032 is subjected to a shear load by tensile and compressive forces between
the bearing points, the pin's magnetic properties change.
As a result of this change, the voltage at the signal line changes, contact 2.
When not subjected to a load (neutral) there is a voltage of approx. 4.75 VDC at the signal line.
This changes when there is a load.
The change is proportional to the load F and is a function of the direction. Account must be taken of the
installation position.
PM-Picturemodule
PMTAB_Picture
B031 / B032 - draft-sensing pin
PMTAB_Picture
Tensile and compressive forces F on
draft-sensing pin B031/B032
F
= Tensile or compressive force
FR
= Forces acting on right bottom link
FL
= Forces acting on left bottom link
1
= Bottom link bearing
2
= Integrated electronics
3
= Coils, transformer