from the ifi manual
Quote:
Brake / Coast Configuration
The Brake / Coast jumper is used to set the speed
controller’s action during a neutral condition. The Brake
provides significant resistance to motor rotation and is
recommended for motors driving linkages and arms that
can be back-driven by gravity or other external forces.
The speed controller checks the status of the jumper
approximately 60 times per second. This allows the user
to change from brake to coast during operation. A limit
switch may be connected to the jumper connector instead
of the jumper. The limit switch can be triggered by
various means including the use of a servo.
Brake / Coast Guidelines:
1. The jumper should always be installed in either the
Coast or Brake position. If you lose the jumper, a
standard computer jumper will work.
2. If no jumper is installed, the speed controller will
default to a Brake condition.
3. The Coast condition sets the output to an open
circuit during neutral.
4. The Brake condition sets the output to a short across
the motor leads during neutral.
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if the pin is set to the left it is set to break
if the pin is set to the right it is set to coast