Technical data, application notes, wiring
PS9031-4820-0001
14
1.0
4.2
Selection of the backup threshold voltage
The buffer behavior – "Fixed Mode" or "Variable Mode" – can be selected with the backup jumper.
Fixed mode
: (jumper in position "2-3" or "45 V fixed")
If the supply output voltage falls below 45 V, buffering begins and the supply voltage is maintained at this
level.
This setting is recommended:
• if power supplies other than the PS3xxx series are used
• with back-feeding loads
• if the buffer module is placed close to the load or
• in case of doubt.
Variable mode:
(jumper in position "1-2" or "VIN – 2 V")
Buffering begins if the supply voltage drops by more than 2 V. Buffering ends if the supply voltage increases
by more than 2 V.
Voltage changes slower than 1.1 V/s are ignored if the voltage is above 45 V. Buffering begins immediately
below 45 V.
This setting is recommended for all applications in which 45 V is too low for the application or if the buffer
module is placed near the power supply.
The factory setting is fixed mode; if the jumper is missing, this also means fixed mode.
