Waeco MagicSpeed MS-400 Instrucciones De Montaje página 50

MS-400.qxd 24/06/03
The cruise control is equipped with two cables, which can be used for the identification of
signals.
1. Blue cable
This serves to identify the cruise signal and the speed signal with a voltage between 1.5
volts and 24 volts and a frequency between 6 Hz and 8.5 kHz. The blue cable should be
used for all signals which apply to the range between the two above mentioned
parameters, i.e. both for the cruise signal and for the engine speed.
2. Yellow cable
It serves only to identify the speed signal with a voltage between 6 volts and 250 volts
and a frequency between 6 Hz and 488 kHz. The yellow cable should be used only to
identify speed signals with a voltage of > 20 volts. Otherwise the yellow cable should be
used only in those cases or applications where engineover-speed protection is also
necessary or the speed signal varies within a range of 6 to 250 volts.
Engine overspeed protection
If a cruise signal is used as signal source in vehicles with manual transmission, then an
engine overspeed protection must be also available so as to prevent engine damage. If
the clutch is depressed whilst the cruise control is activated, then the cruise control must
switch itself off automatically, otherwise damage to the vehicle's engine can occur.
There are two types of engine overspeed protection:
1. If the blue cable is used to transfer the cruise signal, then the yellow cable can be
connected to transfer the engine speed so as to ensure the necessary engine
protection. See also the paragraph on determining the cruise command signals.
2. If an appropriate speed signal does not exist, it is also possible to use a clutch switch.
The clutch switch should be fitted on the clutch pedal so that the cruise control
switches itself off automatically when the clutch pedal is activated (see H 4).
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Cable harness
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