9-16 Application Notes Rexroth IndraDyn A
Further Important Aspects for Dimensioning:
The holding brake is not a safety brake (see DIN EN 954 / 03.97 and
vertical axis data sheet SMBG). Due to uncontrollable influencing factors
such as a rust-film generation on the friction surface, the brake holding
torque can be reduced. Additionally, over voltages and temperatures can
weaken the permanent magnets and the brake.
Bringing these factors together, the following recommendations can be
given for dimensioning the holding brakes to the axles.
The necessary holding torque required for the application must not
exceed a maximum of 60% of the static holding torque (M4) of the
chosen holding brake.
Note: Holding-torque reduction and premature deterioration
occur when braking moving axes!
Do not use the holding brake to stop a moving axis! This is permitted for
EMERGENCY STOP situations only. In this situation, the specified rated
torque of the holding brake (M4) is reduced to the value of the available
dynamic-braking torque. Complete deterioration of the brake`s holding
capacity can be expected after approximately 20,000 revolutions of a
clamped/closed brake.
Observe the instructions on commissioning holding brakes as described
in Chapter 12, ”Startup, Operation, and Maintenance”.
Dimensioning Recommendation
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