Protection Against Short-Time Voltage Dips - Siemens SITOP series Operating Instructions Manual

9.5

Protection against short-time voltage dips

For a drop in the line-side supply voltage, the SITOP modular power supply still maintains
the output voltage for a short time in the millisecond range (see Chapter Technical data
(Page 37)).
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 24 V power supply output (Figure 9-6 Buffering brief power failures using the
SITOP PSE201U buffer module (Page 63)). 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:
SITOP PSE201U manual (http://support.automation.siemens.com/WW/view/en/41129219)
Figure 9-6
SITOP modular 1ph/2ph
Operating Instructions, 06.2014, C98130-A7548-A1-3-7629
Buffering brief power failures using the SITOP PSE201U buffer module
9.5 Protection against short-time voltage dips
Applications
63