Functional Safety – Supplementary manual for series SK 500P
34 BU 0630 en-2020
The value C is determined as follows:
C = 4 nF * t
OSSD
/ 0.1 ms where t
OSSD
= Width of the test pulse, max. 0.5 ms
Additional restrictions may apply with regard to the protective switching device.
3.3.2.2 "Multiple device operation"
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The minimum permissible OSSD pulse for the Safety Digital Input and Safe Pulse Block is 200 μs.
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If the Safe Pulse Block of the plug-in module SK CU5-STO or SK CU5-MLT is used with a single
channel, i.e. the two inputs VIS1_24V and VIS2_24V are connected in parallel, the minimum input
voltage V
24V,min
is increased by a further 0.8 V.
No corrections are necessary if the Safety Digital Input is connected in parallel with the Safe Pulse
Block.
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3.3.2.2 Multiple device operation
If several frequency inverters are operated with one protective switching device, the switching capacity
of the switching device and the load rating of the 24 V mains unit must be observed.
The shield must be correctly connected.
The voltage drop in the cable and the cable resistances must be taken into consideration.
The permissible cable resistance is reduced if the Safe Pulse Block of several frequency inverters is
operated with an OSSD. For the minimum input voltage at the protective switching device, the
calculation must be adjusted depending on the number of frequency inverters.
All inverters at the end of the cable:
,
(
) =
,
ℎ
= " "
24,
= 19.2 + 2.4 ∗
,
∗
For R
wire,max
, refer to the table from Section 3.3.2 "Operation with OSSD".
Inverters distributed evenly along the length of the cable:
,
(
) =
,
∗
2
+ 1
ℎ
= " "
24,
= 19.2 + 2.4 ∗
,
∗
+ 1
2
If the internal resistances of the source and the OSSD dominate, the equations for the case of all
inverters at the end of the cable must be used.
If different inverters are operated on an OSSD, the lowest value for R
wire,max
must be used.
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