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Curtis 1222 User Manual

Curtis 1222
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88
Curtis 1222 Manual, os 15
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 value that will not cause the fault (over the entire
sensor range). Set the
Tolerance to a comfortable margin above the
minimum tolerance found.
“3” Setup for Sawtooth Sensor feedback (see page 42)
a. Set the parameters Min Volts and Max Volts according to the sensor manufacturers
specifications.
If sensor specs are not available, use the voltages shown in the Moni
-
tor » Position Feedback » Analog Input » Analog5 and Analog6 variables as fol-
lows. Find the highest and lowest values of
Analog5 and Analog6 while slowly
sweeping the position feedback device. Input the lowest value as
Min Volts and
the highest value as
Max Volts. Example: While the position feedback device
is moved slowly,
Analog5 and Analog6 are shown to have a maximum voltage
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 » Position Raw variable. Set
the Center Position to the observed angle.
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 » Wheel Position variable. The Left steer direc-
tion must be set up as negative. If the observed angle is positive, change the
Swap Direction parameter and verify that the wheel position sign is now correct.
d. Set the two fault parameters (
Fault Min and Fault Max) to voltages that will not
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
Ana-
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 voltages of the Sawtooth Sensor should always be
0.5*(Max Volts - Min Volts) apart. A fault check is done by comparing the two
voltages and calculating the error. If the error is greater than the
Tolerance
voltage for 60 ms, a fault is issued.
The
Tolerance parameter can be set in either of two ways.
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*(
Max Volts - Min Volts)). This is the minimum
Tolerance value. Set the Tolerance to a comfortable margin above the
minimum Tolerance found.
5 — COMMISSIONING

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Curtis 1222 Specifications

General IconGeneral
BrandCurtis
Model1222
CategoryController
LanguageEnglish

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