Chamberlain MADCBB - Manual (Page 21)

21
WARNING - DISCONNECT BATTERIES AND AC POWER BEFORE
SERVICING ANY MECHANICAL OR MOVING COMPONENTS.
BATTERY CHECKOUT
When the batteries become weak the gate will begin to run noticeably slower.
NOTE: Batteries should only be checked when you are sure they have had
adequate time to fully charge.
1. Turn off the AC power and run gate for 5 to 10 cycles while observing low
battery indicator LED D12. If LED 12 comes ON, batteries are too weak to
function properly. If LED 12 does not light, then voltage should be checked as
they still maybe near failure. Correct voltage is approximately 24.5 Vdc.
NOTE: If LED D12 does light, gate will open to conserve batteries in this test
or in a real power loss, even if mode switch 8 on S2 is off.
Return of AC power will clear low battery indicator. Correct charge voltage is 27.5
Vdc with batteries not connected (set with R63, shown on the Control Board Layout
page).
TROUBLESHOOTING »
BATTERY CHECKOUT + GATE NOT OPERATING
GATE NOT OPERATING
GATE WILL NOT OPERATE.
Check the battery
connections.
Clear the active input to allow the
gate to open.
Clear the active input to
allow the gate to close.
The max timer (MRT) has expired. Remove AC and battery power then reapply to reset.
Inspect the belt for slippage and verify the fast run timer settings are correct.
Make sure the gate is not binding, then adjust the IRD.
Verify the gate reverses when obstructed.
Check fuse F4
Replace if blown.
Is the AC power
LED on now?
Check fuse F3,
Replace if blown.
Allow operator to
charge before
operation.
Restore AC power and/or
turn AC power switch ON.
Is the HBEAT flashing now?
Is the AC PWR LED on?
Is the HBEAT flashing?
Yes
Yes
Yes
No
Is the “BAT LO” LED on?
Is S2-8 (open on AC fail) on?
Is the shadow input active?
Is the Safety, Backaway, or
Open input active?
Does the IRD light while operating?
Is the IRD flashing?
No
No No
Yes
No
Yes
No
No
No
No
Yes
Yes
Yes
No
Yes