Prioritization When The Power Fails - Siemens PSU8600 Manual

Operator control at the device

3.5 Prioritization when the power fails

3.5 Prioritization when the power fails
Note
Function is only available when operated with a CNX8600 expansion module
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 at this output. If
output 1 is prioritized, all of the remaining outputs are shut down 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 shut down are lit red. When the line supply
returns, the outputs that have been shut down are automatically switched-on again.
For the basic device type, the nominal buffer time is typically 15 ms; the buffer time can be
extended using additional buffer modules.
Note
The prioritization when the power fails may only be switched over when the power supply
system is in a no-voltage condition.
The switchover is made at selector switch (see operating controls) with the designation
"PRY 1"
When delivered, DIP switch "PRY 1" is in position "OFF" (prioritization deactivated).
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Power supply system PSU8600
Manual, 05.2017, A5E36758446-3-76