CMM 100 :
INSTALLATION, CALIBRATION AND OPERATION
19
(i) Snap the cover plate into the recess of the long bracket (it only fits one way).
(ii) Assemble the two brackets and mounting plate with the clamping knobs, and
attach to the head unit.
(iii) Having established the orientation for the bracket, fix the mounting plate to the
cab with the self-tapping screws provided.
Do not attempt to adjust the mounting bracket assembly without first
slackening off the clamping knobs, otherwise you might damage the bracket.
6.2.2 12V/24V Power Supply
The Head Unit and Sensor operate satisfactorily over the voltage range 11-30V
DC. Power is fed to the system via the Terminator.
Using a multimeter, check the main electrical panel to identify a suitable +V
supply that is switched via the ignition switch. It may be possible to connect the
power lead directly onto the fuse board using male spade connectors.
Connect the brown wire to the +V terminal and the blue wire to the 0V terminal.
Reverse Polarity and Power LED
The head unit has reverse polarity protection and therefore will not be
damaged if you inadvertently have the power supply connections reversed.
T
he LED on the Terminator PCB will not light when the 0V and +V connections
are reversed. If after connecting the power supply, the instrument does not
power up when you switch the ignition on, then:
(a) Check you have connected to a suitable point on the vehicle electrical system
as described above.
(b) If (a) is OK but the LED is not lit, check the polarity is correct.
(c)
If the LED is lit but the head unit does not come on, check the 18-way
connector is properly connected (section 5.2.3).
