Protection Against Short-Time Voltage Dips - Siemens SITOP Series Equipment Manual

9.3

Protection against short-time voltage dips

For a drop in the line-side supply voltage, the 24 V power supply still maintains the output
voltage for a short time in the millisecond range (see Chapter Technical data (Page 87)).
For line supplies that manifest frequent brief voltage dips, in order to increase the power
supply reliability, it may make sense to increase the line buffering time in the device using an
additional SITOP PSE201U buffer module.
The SITOP PSE201U buffer module, based on electrolytic capacitors, is connected in parallel
to the power supply output (Figure 9-6 Buffering brief power failures using the SITOP
PSE201U buffer module (Page 111)). The buffer time is 200 ms at 40 A up to 1.6 s for a load
current of 5 A. This time can be increased a multiple number of times by connecting buffer
modules in parallel; the maximum buffer time is 10 s.
You can find additional information at:
Manual SITOP expansion modules
(https://support.industry.siemens.com/cs/ww/en/view/109768676)
Figure 9-6
SITOP expansion modules
Equipment Manual, 09.2022, A5E36605235-2-76
Buffering brief power failures using the SITOP PSE201U buffer module
9.3 Protection against short-time voltage dips
Applications
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