Technical specifications
Kendrion INTORQ | BA 14.0217 | 07/2021
30
5.6
Friction work / operating frequency
Based on the specified operating conditions of the ATEX brakes, the friction performance chart as a func-
tion of friction work and operating frequency is depicted. If friction work is to be performed by the brake,
the charts can be used to determine the maximum number of switching operations that must be main-
tained in order to be able to operate the brake within the corresponding ATEX zones. The friction work and
the operating frequency are independent of the rated torque of the brake.
For dust and gas explosive atmospheres, the permissible brake torques of the BFK458 spring-applied
brake must be observed from the tables "Maximum permissible rated torques", as specified in the follow-
ing chapters.
–S
hue
–
1
Q
R
Q
E
S
hmax
In
=
– e
1
Q
Smax
Q
E
=
–S
hue
S
h
The permissible operating frequency S
hmax
depends on the amount of heat Q
R
work / operating frequency, Page 30). At a pre-set operating frequency S
h
, the permissible amount of
heat is Q
Smax
.
Notice
With high speeds of rotation and switching energy, the wear increases, because very high
temperatures occur at the friction surfaces for a short time.
5.7
Dust explosive atmosphere (zone 22: non-conductive dusts)
Friction work
Q [J]
R
Operating frequency S
h
[h ]
-1
100000
10000
1000
100
1
10
100
1000
20
25
18
16
14
12
08
10
06
Fig. 5:
Friction work as a function of the operating frequency BFK-458-ATEX for dust atmospheres
