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Curtis 1222 Manual, os 15
2 9 J A N U A R Y 2 0 1 3 D R A F T
3 — PROGRAMMABLE PARAMETERS: Position Feedback Parameters
POSITION FEEDBACK DEVICE 3 – SAWTOOTH SENSOR
ALLOWABLE
PARAMETER RANGE DESCRIPTION
Center Position (deg) -180.0° – 180.0°
•
n
Defines the position (in degrees) that corresponds to a steer position
0x40D3 0x00 -32768 – 32767 feedback at the center (straight) position (Wheel Position = 0%).
This setting allows the service technician to re-calibrate the
center (straight) without having to physically adjust the sawtooth
sensor.
Min Volts 0 – 10.00 V
•
n
Along with Max Volts and Tolerance, this parameter is used to fault-
check the sawtooth signals.
Max Volts 0 – 10.00 V
•
n
Set this parameter to the maximum voltage of the sawtooth waveform.
0x40EF 0x00 0 – 1023 Along with Min Volts and Tolerance, this parameter is used to fault-
check the sawtooth signals.
Swap Direction On / Off
•
n
Inverts the signal to prevent having to physically swap the wires
0x4015 0x00 On / Off to pins 16 and 17.
Fault Min 0 – 10.00 V Sets the minimum threshold for the Analog 5 and Analog 6 inputs
0x4011 0x00 0 – 1023 of the sawtooth sensor. If either the Analog 5 or Analog 6 voltage falls
below this threshold for 60 ms, a fault is issued.
Fault Max 0 – 10.00 V Sets the maximum threshold for the Analog 5 and Analog 6 inputs
0x4012 0x00 0 – 1023 of the sawtooth sensor. If either the Analog 5 or Analog 6 voltage
rises above this threshold for 60 ms, a fault is issued.
Tolerance 0 – 10.00 V The Analog 5 and Analog 6 voltages of the sawtooth sensor should
0x40E1 0x00 0 – 1023 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. This
provides a second level of fault detection and triggers a separate
Sawtooth Command fault.
Fig. 13 Position Feedback Input Device “3” signal flow.
PCF
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