
6 Additional equipment
6–24 Section 6 © Siemens VDO Trading GmbH TU00-1318-0200302
6.6.2 Checking two speed axle adjustment
Fig. 6-19 HA circuit diagram label
Procedure
– Set the tachograph constant k = 8000 imp/km.
– Connect the unit to the electricity with connection wire "A" and connect wire
"B" to supply pulses to it.
– Set the KTCO test bench to 60 km/h.
– Supply a 0 V potential with negative switching action.
or
– With positive switching action supply a plus potential to connector D5.
In the above example, the tachograph speed must drop from 60 km/h to
43.9 km/h.
6 Label
6
215
MP
km/
Remark
• When the HA board is fitted, attach the two speed axle adjustment label (6)
to the housing.
• Calculate the speed with the rear axle transmission switched off.
Example
i = 1.368 : 1
v
1
= 60 km/h (test bench reading)
v
2
= v
1
: i = 43.9 km/h
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