> The Brake is engaged when no voltage is applied, the break is disengaged
when there is a voltage. When I took it apart it looked as if it used a
spring to hold the brake shoe onto the shaft and a solenoid to release
it.
That's all I got, there is not much information on the manufactures
site.
/>

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Is the brake mostly either fully on or fully off or is it modulated in some
way to be partially off or on.
eg do you turn it off (by applying power), roll the stage somewhere and then
turn the brake on (by turning off power) or is it used to apply partial
brakes by either varying the DC level to the brake or by PWM switching it?

If it is on/off only then I can't see why it should be noisy for electrical
reasons (unfortunately). In this case what may be happening is that the
brake shoes aren't clearing the drum or disk or whatever and 'chattering"
for mechanical reasons. In this case, attention to the mechanical design of
the mechnism or maintenance may be what is required.

If it is switched by eg PWM and electrically noisy then is it noisy when the
brake is OFF but the power is ON.

Is it "noisy" when the brake is off (power on) but with the stage not moving
OR does the noise occur only when the stage is moving?

What is the nature of the noise?

Can you provide a fuller description of how the brake works and what signals
are supplied when it is noisy?



        Russell McMahon

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