INTORQ BFK458 Originalbetriebsanleitung Seite 106

Technical specifications
Engagement time
The transition from a brake-torque-free state to a holding-braking torque is not free of time lags.
For emergency braking, short engagement times for the brake are absolutely essential. The DC-side
switching in connection with a suitable spark suppressor must therefore be provided.
Engagement time: A braking torque reduction via the torque adjustment ring prolongs the engagement
time and reduces the disengagement time. An anti-magnetic pole shim is available when there is excess-
ive prolongation. This plate is installed between the stator and the armature plate. The plate reduces the
engagement time and prolongs the disengagement time.
Engagement time for AC-side switching: The engagement time is significantly prolonged (approx. 10 times
longer).
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If the drive system is operated with a frequency inverter so that the brake will not be de-energized be-
fore the motor is at standstill, AC switching is also possible (not applicable to emergency braking).
¾
The specified engagement times are valid for DC switching with a spark suppressor.
– Circuit proposals: refer to DC switching at mains – fast engagement, Page 53.
Disengagement time
The disengagement time is the same for DC-side and AC-side switching. The specified disengagement
times always refer to control using INTORQ rectifiers and rated voltage.
INTORQ | BA 14.0168 | 08/2019
NOTICE
Connect the spark suppressors in parallel to the contact. If this is not admissible for safety
reasons (e.g. with hoists and lifts), the spark suppressor can also be connected in parallel
to the brake coil.
Notice
Spark suppressors are available for the rated voltages.
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