Cycle Analyst V3.1 User Manual
Rev 1.0
6.8 Setting Up PAS or Torque Sensors
The setup of a PAS sensor involves telling the CA3 details of both the type of
PAS device that is connected, as well as how to respond to pedal input.
The Setup PAS Device preview screen shows the state of both the digital PAS
signals, with an arrow beside the letters 'P' and 'D'. When you rotate the cranks,
either one or both of these should toggle up and down. If only the 'P' arrow
toggles you have a 1 wire PAS sensor, while if both the 'P' and 'D' alter in
succession you have a 2-wire (quadrature) sensor. The number of PAS poles
should equal the number of times this signal toggles in one complete crank
revolution.
The preview screen also shows the voltage coming from the torque sensor. On
most torque devices this will sit somewhere between 1-2.5V, and then either
increase or decrease as you apply force on the pedals. With no torque sensor
attached the voltage will rise to nearly 5V.
Configuring a basic PAS device involves setting the number of PAS poles and
the fwd/rev direction sense. The correct setting for the Direction Polarity varies
with installation, depending on whether the sensor is installed on the left or the
right crank. If the CA shows a human RPM reading when the cranks are spun
backwards and not when spun forwards, then the direction polarity setting needs
to be flipped.
With a torque sensor, the CA also needs to know the voltage when there is no
torque on the pedals, and how this voltage increases with applied pedal torque.
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