Engineering and remote access
7.4 SIMATIC STEP 7 in the TIA Portal
Power supply system SITOP PSU8600
186
Manual, 09.2018, A5E36758446-5-76
●
Prioritized buffering of output 1
When the power fails, output 1 of the basic unit can be prioritized so that it is still
supplied.
Prioritizing output 1 means that the longest possible buffer time is ensured for this output.
If output 1 is prioritized, all of the remaining outputs are switched off at approximately half
of the nominally available buffer time for the remaining duration of the power failure.
LEDs
"ON/OFF/RST" of the outputs that have been switched off are lit red.
Outputs 2...n, which are shut down when the power fails as output 1 has priority, are
automatically switched-on again when the line supply returns.
For the basic unit, the typical buffer time is 15 ms, additional buffer modules extend the
buffer time.
●
Soft output characteristic
For operation in parallel, the output voltage decreases with increasing output current.
This
means that for full output current the highest output voltage can normally no longer
be
attained.
●
System start characteristics
In order to reduce the load on the overall SITOP PSU8600 power supply system as a
result of simultaneous switch-on current peaks of the loads at the various outputs, an on
delay between the outputs can be selected when switching on.
When the on delay is activated, the outputs are sequentially switched-on with a 25 ms or
100 ms delay time between the outputs, or load optimized.
When the variable on delay is activated, you can assign individual on delay times to the
individual outputs.
●
Threshold for system output current prewarning
When changes are made, the prewarning threshold for the summed current allows you to
quickly check the utilization of the overall system. This is especially of interest when
expanding the system. As a consequence, using the prewarning threshold increases the
operational reliability.
Enter a value of "0 %" to deactivate the prewarning threshold.
●
Dead time for system output current prewarning
An alarm for the prewarning threshold for the total current is only initiated if a continuous
system overload occurs, which is longer than the set dead time.
●
General prewarning threshold for individual output current in MANUAL mode
Here, it is possible to define a common threshold value for all outputs, above which an
alarm is output.
Enter a value of "0 %" to deactivate the prewarning threshold.
●
Dead time for alarm message 'Input voltage outside permitted range'
A buffer mode alarm is only initiated if the power continuously fails for a time that is
longer
than the set dead time.