Rockwell Automation Publication 1606-RM105A-EN-P - July 2020
9
Select the Backup
Threshold Voltage
The functionality of the buffer is determined by what mode the buffer is in,
either Fixed mode or Variable mode. You can set the mode using the backup
jumper selector. The factory default setting is Fixed mode. If the buffer has no
jumper, it is also in Fixed mode.
Fixed Mode
The buffer module is in Fixed mode when the jumper is in position “2-3” or
position “22.5V fixed”.
If the supply output voltage falls below 22.5V, buffering starts and the supply
voltage is kept at this level.
Fixed mode is recommended in the following situations:
•
when power supplies other than bulletin 1606-XL S power supplies are
used
•
with back-feeding loads
•
when the buffer module is placed close to the load
•
whenever in doubt
Variable Mode
The buffer module is in Variable mode when the jumper in position “1-2” or
position “VIN – 1V”.
Buffering starts if the supply voltage decreases by more than 1V. Buffering
ends when supply voltage increases by more than 1V.
Voltage changes slower than 0.54 V/s are ignored if the voltage is above 22.5V.
Below 22.5V buffering starts immediately.
Variable mode is recommended in the following situations:
•
22.5V is too low for the application
•
when the buffer module is placed close to the power supply