Electronic Speedometer With Pwm Output - Siemens VDO modulcockpit II Product Manual

Technical Product Manual
VDO modulcockpit II
5. Testing Instructions
5.8 Electronic Speedometer

Electronic Speedometer With PWM Output

Test method description:
Basic settings:
,
Current consumption measurement
Connect the instrument per test circuit diagram I with the test cable No. 4.
Value range: 12 to 24 V instruments
Test of outputs pin 3 and pin 5
Connect the instrument per test circuit diagram II with the test cable No. 4 and the measuring cable.
Value range: 12 to 24 V instruments
Odometer test
Connect the instrument per test circuit cable III with the test cable No. 4 and the measuring cable.
Connect a square wave signal with a frequency corresponding to the maximum speed range and the
distance/pulse number to pin 8. The formula for the calculation of the maximum square wave signal
frequency can be found under pointer position test (full scale deflection). The amplitude can have any
value between 1 and 10 V.
After connection of the operating voltage the display will show the total mileage or the trip distance.
Set fequency generator to 0 Hz and slowly increase the speed until the odometer starts counting
(e. g. at 60 km/h; 1 minute = 1 kilometer).
It is not possible to erase the total mileage count.
Test of pointer position: test of the zero point
Connect the instrument per test circuit diagram III with the test cable No. 4 and the measuring cable.
Switch the operating voltage on and check the pointer deviation. The deviation shall not exceed
± 1 degree of angle.
Test of pointer position: test of full scale deflection
Connect the instrument per test circuit diagram III with the test cable No. 4 and the measuring cable.
TU00-0740-0000002
12 to 24 V instruments
speed x distance/pulse number (K)
f =
max
I = 52 ± 5.2 mA
U = 14.5 ± 2 V
[Hz]
3600
0904
437-260-980-. . .
437-809-980-. . .
U = 18 ± 2 V
5 - 18