Applications
9.5 Protection against short-time voltage dips
SITOP PSU300M/300B
Manual, 11.2014, C98130-A7574-A2-2-7629
71
9.5
Protection against short-time voltage dips
For a drop in the line-side supply voltage, the SITOP PSU300M/300B power supply still
maintains the output voltage for a short time in the millisecond range (see Chapter Technical
data (Page 39)).
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 Buffer module (Page 71)). 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
Buffer module
