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DoN. Nichols DoN. Nichols is offline
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Default Hurco VFD Max RPM & braking

On 2009-02-22, oldjag wrote:

[ ... ]

I installed the 250 watt 60 ohm resistor as per the manual. It does
not seem to be adding to the brake torque, ie the decell time is the
same. I suspect some kind of translation error or omission in the
manual that is leaving out a parameter needed to enable the resistor
braking correctly.


That may be.

The resistor is not even getting warm after
several full rpm to zero stops.


Could you measure voltage on the resistor during the stops? i
would guess not.

Guess I gota call Teco's help line
Monday. Any thoughts on exceeding the base RPM, ie. 2X on a 1800 rpm
motor?


I would be a lot happier about that than on a 3600 RPM motor,
since the same rotor is used in many motors of the same size, so it is
likely built to handle 3600 RPM without problems.

Enjoy,
DoN.

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