Technical data

58
Additional shift stage
0
01234 67895 1011121314 1617181915 20
1,0
2,0
3,0
4,0
5,0
The primary coil is excited by a constant
square-wave alternating voltage (from control
unit J556). This induces a square-wave
alternating voltage in the secondary coils.
As previously explained, the permanent
magnet effects a magnetic saturation of the
flat steel core. The permanent magnet divides
the coil system electro-magnetically into two
areas (S1 and S2).
Excited by the primary coil, alternating
voltages are induced in the secondary coils,
which have opposite phases and different
amplitudes depending on the position of the
permanent magnet (piston position).
If the permanent magnet is located in the
centre of the two secondary coils, their
voltages increase sharply. In this position the
voltage between S1 and S2 is equal to zero.
0.9 mm
Low range
8.8 mm
Mechanical mid point
(neutral position)
Signal from the
primary coil
Signal from the
secondary coils
S1 and S2
Signal voltage
from J556
to J554
1.18 V
16.8 mm
Low range OFF
11.6 mm
Electrical mid point (the permanent
magnet is located centrally between
coils S1 and S2)
2.65 V
3.15 V
4.09 V
Illustration of the travel sensor system
Relationship between the switching mechanism and the travel sensor system
Travel in mm
Travel in mm