Technical data
3
j
| BA 14.0196 | 05/2013
18
Engagement time
The transition from brake-torque free state to holding braking torque is not free of time lags.
Short brake engagement times are vital for emergency braking. DC switching together with
a suitable spark suppressor must therefore be provided.
|
The engagement times are valid for DC switching with a spark suppressor.
– Spark suppressors are available for the rated voltages.
– 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.
– Circuit proposals:
36
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If the drive system is operated with a frequency inverter so that the brake will not be
deenergised before the motor is at standstill, AC switching is also possible (not
applicable to emergency braking).
Note!
If the drive system is equipped with a frequency inverter, the engagement times
are greater by a factor of 5, approximately, connection
35.
Disengagement time
The disengagement time is the same for DC and AC switching. The disengagement times
specified always refer to the control with overexcitation.
Summary of Contents for BFK455
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