4 MR550 User’s Manual
Chapter 1 - First Look

NOTE: UPS battery can be used for normal operation when

there is no main power and also as a data backup battery.

Data entered should not be considered properly stored until

the built-in backup battery has been adequately charged.

1.3 - First Steps with the MR550
Insert key into lock and turn
key with anti-clockwise
direction.
1. Lift up back-plate to about 45°.2.
3. Ensure the UPS
battery is connected
via the white connector.
Use a pen or screw driver to push the dip
switch to the side away from the connec-
tor (towards the bottom of the unit) to
enable the backup battery.
Charge the UPS battery for at
least 16 hours.
Plug the Power Supply into your
wall socket.
4. Plug the 13.5VAC Power Supply
into the MR550’s terminal
block’s AC connector on inner
side of back-plate