Technical data
34
Operating instructions DC(S)
ELTROPLAN
-
REVCON
Elektrotechnische Anlagen GmbH
3.3.4
Thermal limited load graphs
By means of these thermal limited load graphs you can find out the maximum switch-on-
time depending on the needed braking power. The curves are valid
for
a
maximum
cool-
ing
air temperature of 40°C (108°F).
Example of an application:
Diagram 3.3.4.1.1
Example
:
Necessary braking power
: 33 kW
Braking duration
: 2 min.
Time between two brakes
: 5 min.
Evaluation:
In this case the point of intersection of braking time and intermission time is below the thermal
limited power graph in the allowed area.
Example
:
Necessary braking power
: 45 kW
Braking duration
: 3 min.
Time between two brakes
: 3 min.
Evaluation:
In this case the point of intersection of braking time and intermission time is above the thermal
limited power graph. That means this operation cycle is not allowed.
Remark:
In case of an intermission time of e.g. 3,5 min. this operation cycle would be allowed again.
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
11
100 % constant power: 26 kW
33 kW
45 kW
min
Braking
time
min
Intermission time
REVCON
DC(S
))))
45-400-1-0
2
2
1
1
