Setup For Sawtooth Sensor Feedback - Curtis 1222 Manual

5 — COMMISSIONING
88
2 9 J A N U A R Y 2 0 1 3 D R A F T
Sensor (Fault Code 48) is generated. Repeat this until you find the
minimum
Tolerance
sensor range). Set the
minimum tolerance found.
—
"3"

Setup for Sawtooth Sensor feedback

a. Set the parameters
MinVolts
specifications.
If sensor specs are not available, use the voltages shown in the Moni-
tor» Position Feedback» Analog Input»
lows. Find the highest and lowest values of
sweeping the position feedback device. Input the lowest value as
the highest value as
Max Volts
is moved slowly, Analog5
of 4.1 V and a minimum voltage of 1.9 V; therefore, Max Volts = 4.1 V and
Min Volts = 1.9 V.
b. Use the steer command input to move the steered wheel (and the position
feedback Sin/Cos Sensor) to the center position and observe the angle shown
in the Monitor» Position Feedback» Analog Input»
the to the observed angle.
Center Position
c. Use the steer command input to move the steered wheel (and the position
feedback Sawtooth Sensor) to the Left position and observe the angle shown
in the Monitor»Position Feedback»
tion must be set up as negative. If the observed angle is positive, change the
parameter and verify that the wheel position sign is now correct.
Swap Direction
d. Set the two fault parameters (
be reached during normal operation, but will be reached if the position feed-
back inputs become faulty (e.g., should there be an open or short circuit).
The Fault Min settings must be below the minimum voltage seen on
log5 or Analog6 when steering between the maximum left and right positions.
The Fault Max settings must be above the maximum voltage seen on
Analog5 or Analog6 when steering between the maximum left and right positions.
e. The Analog5 and Analog6
0.5*( -
Max Volts Min Volts
voltages and calculating the error. If the error is greater than the
voltage for 60 ms, a fault is issued.
The parameter can be set in either of two ways.
Tolerance
1. Obtain the tolerance of the sensor from the manufacturer's specs, and
then calculate the worst case difference between the two channels.
Next determine the difference between the worst case and the ideal,
ABS (WorstCase - 0.5*(
value. Set the
Tolerance
minimum Tolerance found.
value that will not cause the fault (over the entire
to a comfortable margin above the
Tolerance
(see page 42)
and according to the sensor manufacturer's
MaxVolts
Analog5
Analog5
. Example: While the position feedback device
and Analog6 are shown to have a maximum voltage
Wheel Position
and
Fault Min Fault Max
voltages of the Sawtooth Sensor should always be
) apart. A fault check is done by comparing the two
-
Max Volts Min Volts
to a comfortable margin above the
Tolerance
and Analog6 variables as fol-
and Analog6 while slowly
Min Volts
Position Raw variable. Set
variable.The Left steer direc-
) to voltages that will not
Ana-
Tolerance
)). This is the minimum
Curtis 1222 Manual,
os 15
and