Technical data
8.7 Switching frequency
M200D PROFIBUS/PROFINET
Manual, 08/2014, A5E01577426A/RS-AA/004
175
8.7
Switching frequency
The switching frequency specifies how many switching cycles can be performed in one time
unit (e.g. in 1 hour) with the switching device under normal operating conditions.
If motors are switched too often, this causes the thermal motor model to respond.
The maximum permissible switching frequency depends on the following operating data:
●
Rated current I
e
of the motor
●
ON duration ED
●
Degree and category of protection
●
Ambient conditions such as
–
Temperature
–
Installation position
ON duration ED
The relative ON duration ED in % is the ratio between the load duration and the cycle
duration on loads that are switched on and off frequently.
The ON duration ED can be calculated using the following formula:
ED
ON duration [%]
t
s
Starting time [s]
t
b
Operating time [s]
t
p
Idle time [s]
Graphics-based representation:
Figure 8-1
ON duration ED
Содержание SIRIUS M200D
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Страница 90: ...Functions 3 22 Logbook M200D PROFIBUS PROFINET 90 Manual 08 2014 A5E01577426A RS AA 004 ...
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Страница 222: ...Appendix A 2 Order numbers M200D PROFIBUS PROFINET 222 Manual 08 2014 A5E01577426A RS AA 004 ...
Страница 224: ...Correction sheet M200D PROFIBUS PROFINET 224 Manual 08 2014 A5E01577426A RS AA 004 ...
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