INTORQ BFK458 - Switching Energy and Operating Frequency

Technical specifications
INTORQ | BA 14.0168 | 11/2018 30
¾
The specified engagement times are valid for DC switching with a spark suppressor.
– Circuit suggestions: refer to DC switching at mains – fast engagement
,Page53 ,
Notice
Spark suppressors are available for the rated voltages.
Disengagement time
The disengagement time is the same for DC-side and AC-side switching. The specified disengagement
times always refer to control using INTORQ rectifiers and rated voltage.
4.5 Switching energy / operating frequency
Switching energy Q [J]
R
Sizes
Operating frequency
S
h
[h ]
-1
Fig.5: Switching energy as a function of the operating frequency
The permissible operating frequency S
hmax
depends on the amount of heat Q
R
(refer to Figure Switching
energy / 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 strongly, because very
high temperatures occur at the friction surfaces for a short time.