Siemens SITOP PSU8600 - Page 214

Engineering and remote access
7.5 SIMATIC STEP 7
Power supply system SITOP PSU8600
214 Manual, 09.2018, A5E36758446-5-76
Parameters, general
Parameter
Value range
Default setting
Prioritized buffering of output 1
Yes/no
No
Soft output characteristic Yes/no No
System start characteristics
• No on delay
• On delay 25 ms
• On delay 100 ms
• Load-optimized on delay
• Variable on delay
No on delay
Threshold for system output current prewarning 0 - 100 % 90 %
Dead time for system output current prewarning
0 - 60 000 ms
5000 ms
General prewarning threshold for individual out-
put current in MANUAL mode
0 - 100 % 90 %
Dead time for alarm message 'Input voltage out-
side permitted range'
0 - 1 000 ms 0 ms
●
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, ar
e
aut
omatically 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
10 ms delay time between the outputs, or load optimized.
When the variable on delay is activated, you can assign individual on delay times to th
e
i
ndividual 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.