How can I find the Time Constant of older braking resistors for use with the ATV900 series drives?

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Issue:
Time Constant for older braking resistor I want to use with my ATV900.

Product Line:
ATV900 series drives.

Environment:
All models, All serial numbers where a braking resistor is being added.

Cause:
The ATV900 series drives requires a "time constant" setting when using a braking resistor. This information is not available for older resistors.

Resolution:
It is recommended to use the braking resistors in the ATV900 catalog which have this value listed. Resistors from older applications may not be compatible with the braking resistor/transistor system of the 900 series drive. This information will not be available on some older resistors.