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Originally Posted by Al Skierkiewicz
The dynamic brake in a Victvor will not keep a robot on the ramp. It effectively is a method where in converting mechanical energy to electrical energy being delivered to a dead short provided by the brake, causes a similar load to be applied to the motor. Energy is generated only when the motor is moving.
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Al,
While I agree that the Brake function in the Victors will not hold a robot still in the ramp, it does help a bit. According to the
Victor manual,
Quote:
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Originally Posted by Innovation FIRST
The Brake condition (Jumper on Outer two pins)
sets the output to a short across the motor leads
during neutral.
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So,
some resistance to turning will be achieved, even when the robot is disabled:
Quote:
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Originally Posted by Innovation FIRST FAQ
It seems that dynamic braking is disabled when the victor recieves no pwm input, (when the robot is disabled in the FIRST competition), regardless of the brake/coast jumper. Is this correct?
Would it be possible to let braking remain active when not recieving a pwm signal in later revisions of the 884?
No. When the Victor 884 does not a have a PWM signal, it looks at the jumper setting. If the jumper setting is Coast Mode, the Victor will remain in Coast. If the jumper setting is in Brake Mode, the Victor will remain in Brake Mode. Be aware that braking is proportional to the motor turning. Thus you can still turn a motor by hand slowly while in Brake Mode but it would be very difficult to turn it fast.
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For the students that never played with it, the best motor to try it on is the FP with the gearbox attached. Try turning it with the leads connected and you'll see exactly what the Victor does when it is set to Neutral (a pwm output of 127) or has no signal while the Brake jumper is selected.