Determining The Proper Mounting Height; Mounting Types; Test Power And Communication; Figure 1: Vehicle Access Mounting For Barrier Arm Or Slide Gate - Chamberlain LiftMaster Q Installation Manual

Figure 1: Vehicle Access Mounting for Barrier Arm or Slide Gate

Determining the proper mounting height

The proper mounting height for the Q Access Keypad varies with the
application. Gooseneck stands are available at the standard height of 42"
(at the center of the keypad) for the average vehicle. These stands make
installation much simpler for vehicle access. Your local building codes
may set a minimum and maximum height for any device accessible by
vehicle.

Mounting Types

There are many different ways to mount the Q Access Keypad. The three
most common are: mounting to a gooseneck stand, surface-mounting to a
wall, and flush-mounting in a wall. Each of the three is discussed.
Q Access Keypads require power and communication lines to be
supplied from the controller. Power and data communication must be run
through a single 18 AWG 4-conductor shielded cable. This works well in
most cases, however, some installations may require larger gauge wire.
In addition to the power and communication cable, there may also be
cables needed for the gate operator or door strike, a presence detector,
or other devices. Never install other devices in the same run of wire as
the keypad. Use a different cable for each device. Most communities
require the wiring to be supplied to the keypad through approved
electrical conduit. Local building codes determine the actual installation
techniques and wiring methods. Q Access Keypads should only be
installed by licensed contractors.
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Test power and communication

Step 1
Does the Q Access Keypad have Power?
Yes – Proceed to step 2
No – Check Power Supply and Wiring and retest or see Multiple
Device Problems
This can be tested quickly by checking the display of the keypad. If the
display is on or if any of the LEDs on the board are on, the board has
power. If there is no indication of power from the display or LEDs, use a
volt meter to check for the presence of voltage on connector P1 pins 1 &
2.
Step 2
Is the voltage at the Q Access Keypad, connector P1 pins 1 & 2, greater
than 10.5 Volts? (Use a volt meter to measure the voltage).
Yes – Proceed to step 3
No – Check Power Supply and Wiring and retest
Step 3
Is the voltage at the Q Access Keypad, connector P1 pins 1 & 2, greater
than 18 Volts? (Use a volt meter to measure the voltage).
Yes – Voltage is too high, check power supply and retest
No – Proceed to step 4
NOTE: Create a voltage map of the site by sketching out the locations of
every AI device on the site. Use a multimeter to take DC power readings at
each device. Note these readings on the sketch. Any device that is receiving
less than 12V is underpowered and can cause the entire system to lock up.
Step 4
Is the display on the Q Access Keypad blank?
Yes – Replace the keypad and retest
No – Proceed to step 5
Step 5
Is the Q Access Keypad communicating with the controller and software?
Yes – Contact Technical Support if the keypad is still not
working.
No – Check wiring and proceed to step 6
This can be determined by checking the LEDs on the circuit board or by
running the system setup report on the controller. When the keypad is
communicating with the controller, LEDs D1 – D6 will be blinking. If only
D1 and D4 are blinking, proceed to step 7. Refer to Figure 9 for the
location and function of the LEDs.
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