Operator control at the device
3.5 Prioritization when the line supply fails
Power supply system SITOP PSU8600
Manual, 09.2018, A5E36758446-5-76
91
Prioritization when the line supply 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 has priority, then in buffer operation, initially all outputs of the system are buffered.
After a certain time, outputs 2 … n are automatically shut down for the remaining duration of
the power failure so that approximately half of the nominal buffer time is solely available for
output 1. LEDs "ON/OFF/RST" of the outputs that have been switched off are lit red. When
the line supply returns, the outputs that have been switched off are automatically switched-
on again.
For the basic unit, the buffer time is typically 15 ms; the buffer time can be extended using
additional buffer components.
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 DIP switch with the designation "PRY 1" ⑤ (see operator
controls).
When delivered, the DIP switch "PRY 1" is in position "OFF" (prioritization deactivated).
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