Chamberlain WD952LD - Manual (Page 33)

33
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.
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.
(Green LED)
(Yellow LED)
(Red LED)