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How do I connect and calibrate my CAI Stepper Motor Speedo? |
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Speedometers, stepper motor technology, front face programmable part numbers XES3/5-1Bxx-xx (x indicates any character in the part number) Caution Disconnect
the
Negative
battery cable prior to any installation Do I have a stepper motor speedo or an earlier air core version? The Earlier air core version speedo's calibration is set via 10 switches located at the rear of the instrument under the grommet. The later stepper motor speedo's calibration is set via a remote push button assembly supplied with the speedo or set through the push button, located on the glass at the front of the instrument. Application
notes The
operating voltage is nominally 12 volts. The range of operation is 10
to 16 volts, negative earth only. The speedometer is intended for
panel mounting, it is shower proof from the front only and must be
protected from environmental damage at the rear. The speedometer must
be calibrated to suit the pulses per mile or km of individual vehicles
using the programming harness and push button assembly (supplied in
your kit as an accessory) or via the reset button on the front of the
instrument. This must be done when the speedometer is installed in the
vehicle and powered. The
calibration range is from 2,500 to 128,000 pulses per mile. Wire
Colour
Pin
No Connect
to Green
1 Switched
Ignition positive 12volt
supply ,3A Fuse Setting
the pulses per mile The
calibration mode is selected by switching on the ignition while
simultaneously holding the programming button and waiting for 3
seconds. After
3 seconds release the reset button, in calibration mode the odometer
display will flash. By
momentarily pressing and releasing the reset button each number
(extreme left side first) can be incremented to your desired value. When
the desired value is selected release the button and wait 3 seconds. The
next number to the right will flash, increment this number in the same
way and continue until all the numbers are programmed to your pulses
per mile/km. At
the end of the sequence wait 3 seconds and the speedometer will return
to normal operation. If you switch off at any time before the end of
the sequence no changes will be programmed. For
most of the following calculations you will need to know the number of
times that your tyre revolves per mile or kilometre. Stand the vehicle
on a flat surface and make a mark on the tyre at the closest point to
the ground , mark the floor at the same point. Move the vehicle
forwards for one revolution of the the tyre and measure the distance
covered. 63360
divided by the distance covered in inches = tyre revs per mile 1000
divided by the distance covered in millimetres = tyre revs per km measure
the rolling radius (RR) of wheel and tyre, from centre of hub to
ground in inches/mm How
to calculate the pulses per mile/km (calibration number) Prop
shaft mounted magnetic sensor (magnets or Bolt heads moving past the
sensor) Calibration
number = (tyre revs per mile or km) x (differential ratio) x (no of
magnets or bolts) Sender
driven from transmission cable drive Calibration
number = (cable turns per mile or km) x (number of pulses per
sender revolution) Calculate
RR as above Push
vehicle forwards on flat ground for 6 tyre revolutions and count
number of cable turns. 1680
x (cable turns) divided by RR for inches |
