Technical specifications
Kendrion INTORQ | BA 14.0217 | 07/2021
35
Size
Number of switching operations
per hour
Speed [rpm]
800
1500
1800
2500
3000
18
6
18375
11393
11140
10889
10
17579
11260
10983
10700
20
6
19865
12797
12546
10700
10
19004
12722
12447
12193
25
6
20440
14199
14447
12163
10
19881
14157
14391
Tab. 11:
Permissible speed, depending on the number of switching operations, that is typical for facility acceptance
tests.
5.9
Example calculation for the charts
Notice
The number of switching operations must be evenly distributed over the course of one hour.
If, at a speed of 2500 rpm, a size 06 brake should be used for gas zone applications, the calculation must
be made as follows: If the brake will be performing friction work of 1000 J
①
, then 85 switching operations
per hour
②
are allowed. In order not to overload the brake thermally, these 85 switching operations
should be distributed evenly over the time interval:
60 minutes x 60 seconds / 85 switching operations = 42.3 seconds
In this example, in each interval of 42.3 seconds, the ATEX brake is permitted to carry out 1000 J of fric-
tion work.
5.10
Electromagnetic compatibility
Notice
The user must ensure compliance with EMC Directive 2014/30/EC using appropriate controls
and switching devices.
NOTICE
If a Kendrion INTORQ rectifier is used for the DC switching of the spring-applied brake
and if the switching frequency exceeds five switching operations per minute, the use of a
mains filter is required.
If the spring-applied brake uses a rectifier of another manufacturer for the switching, it
may become necessary to connect a spark suppressor in parallel with the AC voltage.
Spark suppressors are available on request, depending on the coil voltage.
