lift-master 475lm Manuale Utente

Battery Backup Unit (BBU) Diagnostics

GREEN LED:

All systems are normal.

• A solid LED light indicates the batteries are fully

charged.

• A flashing LED indicates the batteries are being

charged.

NOTE: Batteries do not have to be fully charged to
operate the motor unit.

YELLOW LED:

The motor unit has lost power and is operating off of
the BBU.

• A solid LED with beep, sounding approximately every 2

seconds, indicates the motor unit is activating the door
and is operating off of the BBU.

• A flashing LED with beep, sounding every 30 seconds,

indicates batteries are low.

• Once the power is restored the BBU will recharge. This

is indicated by a flashing green LED.

RED LED:

An error has been detected and the BBU will
automatically shut off. The BBU will attempt to restart by
reconnecting to the batteries. If the error is still present it
will shut itself off again. This process will repeat every 5
minutes or until the error has been resolved. This is used
to prevent further draining of the batteries.

• If a red LED remains on when the power is restored,

and is accompanied by a beep sounding every 30
seconds, please call for service.

114A2745C

OPERATING INSTRUCTIONS

1. Test the installed BBU with the motor unit.

To test the BBU, disconnect the motor unit power cord
from the electrical outlet.

• A solid yellow LED indicates the BBU is operating on

battery power.

• A flashing yellow LED with beep indicates the BBU is

operating on battery power and that the battery charge
is low.

• To test the BBU is functioning properly, open and close

the garage door.

• Re-connect the motor unit power cord back into the

electrical outlet.

• Verify that the green LED is flashing on the BBU

(indicates that the BBU is now charging).

• Test completed

2. Charge the battery.

• Allow the batteries 24 to 48 hours to fully charge before

using the BBU system.

A fully charged BBU supplies 24V DC to the motor unit
for one to two days of normal operation during an
electrical power outage. If the battery voltage drops too
low, the batteries will disconnect and the motor unit will
no longer operate under battery power.

After the electrical power has been restored, the
batteries will recharge within 48 hours. Under normal
usage batteries will last 3 to 5 years.

To obtain maximum battery life and prevent damage,
also disconnect the battery backup if you unplug the
motor unit while on vacation or any other extended
period of time.

NOTE: Door operation may be limited until batteries are
fully charged. The motor unit’s lights will not turn on
during BBU mode.

To reduce the risk of FIRE or INJURY to persons use only
Chamberlain part #41B591 for replacement batteries.

WARNING

CAUTION

WARNING

Replacement Parts

12V Rechargeable Batteries (2) . . . . . . . . . . . . . . . .41B591

Power Supply Board . . . . . . . . . . . . . . . . . . . . . . . .41A5726

Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72A35

FOR SERVICE, DIAL OUR TOLL-FREE NUMBER:
USA 1-800-528-2817 • CANADA 1-800-654-4736

(Green LED)

(Yellow LED)

(Red LED)