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Technical specifications
Type
Rated torque
M
K
[Nm]
2 x 1100
2 x 1200
BFK455-28
2 x 1700
2 x 1800
2 x 2065
Tab. 3:
Switching energy - switching frequency - switching times
1)
Minimum brake torque with run-in friction components at Δn=100 rpm
2)
Typical values
3)
Max. speed according to EC-type examination certificate (for higher speeds, consultation with the manufacturer is re-
quired)
4)
Measured with induced voltage limitation of -800 V DC
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 switching in
connection with a suitable spark suppressor must therefore be provided.
❚
The engagement times apply 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 switching 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:
❚
If the drive system is operated with a frequency inverter so that the brake will not be de-energised before
the motor is at standstill, AC switching is also possible (not applicable to emergency braking).
NOTICE
If the brake is using AC-side switching, the engagement times increase approximately by a fac-
tor of 5 (refer to
Disengagement time
The disengagement time is the same for DC and AC switching. The specified disengagement times always
refer to control using over-excitation.
INTORQ | BA 14.0196 | 04/2016
Max.
Transitional
1)
permitted
switching
switching
frequency
energy
Q
S
E
[J]
[1/h]
360000
36
35 for connection).
Switching times [ms]
at s
LN
Engaging DC side
hue
t
t
11
12
80
60
7
220
20
30
2)
Max. speed
and 0.7 I
N
4)
Disengaging
t
t
1
2
300
370
280
240
480
250
460
3)
n
max.
[rpm]
455
255
455
255
18
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