# Deadband

Thanks

Rick

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*andypugh*on topic

*Re:Deadband*

**LAIR82 wrote:**

I was wondering if anyone would have a calculation to establish a value for my "deadband"

Is there a problem with zero?

If so, just increase it until the problem goes away.

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*LAIR82*on topic

*Re:Deadband*

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*andypugh*on topic

*Re:Deadband*

**LAIR82 wrote:**

Deadband sets how much either way of my commanded position it is allowed to deviate from correct?

Not quite. It sets a band around the setpoint where the controller doesn't even attempt to correct the position error.

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*jmelson*on topic

*Re:Deadband*

**LAIR82 wrote:**

Take whatever your resolver converter produces when converted to axis unitsI was wondering if anyone would have a calculation to establish a value for my "deadband" . I have read the section in the integrators manual and see the formula if using encoders, but we have resolvers on our machine, and i was not sure how to go about the math to establish a starting point.

Thanks

Rick

and multiply by 1.5 for a starting value. So, if you have 4096 counts/rev and

a 5 TPI leadscrew, then your resolution is 1/(4096 * 5) = 0.0000488 inch.

So, a good starting value would be 7.32E-5

You want to keep this value as small as possible while suppressing annoying

servo dither. If it is too large, it adds a discontinuity in the servo transfer

function as it crosses zero, and can make the loop unstable.

And, of course, if you DON'T have any dither, then use zero.

Jon

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*LAIR82*on topic

*Re:Deadband*

Thanks

Rick

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