Chamberlain Liftmaster LA405-24 User manual

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Linear Actuator
Swing Gate Operator
Installation Manual
Model # LA405-24

2Contents
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Contents
Product Information and Specs. _____________________________________________ 3
Mechanical _________________________________________________________________________ 3
Electrical, Line Connections____________________________________________________________ 3
Electrical, Control Connections _________________________________________________________ 4
Preparations _____________________________________________________________ 5
Site Preparation______________________________________________________________________ 5
Site Layout _________________________________________________________________________ 6
Mechanical _________________________________________________________________________ 7
Electrical ___________________________________________________________________________ 8
Operating Instructions____________________________________________________ 12
Initial Test _________________________________________________________________________ 12
Functional Test _____________________________________________________________________ 14
End User Instructions ________________________________________________________________ 15
Replacement Parts _______________________________________________________ 17
Illustrated Parts _____________________________________________________________________ 17
Warranty And RGA (Returned Goods Authorization) _______________________________________ 18
Service and Tech. Reference _______________________________________________ 19
Service And Maintenance _____________________________________________________________ 19
Trouble Shooting____________________________________________________________________ 19

Product Information and Specs. 3
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Product Information and Specs.
The LA405-24 electromechanical gate operator can be mounted onto any swing gate up to 12 feet
wide. It is well equipped with a simple adjustable limit switch and a keyed emergency release.
Mechanical
Approx. Weight 22 lbs.
Dimensions 32.25”L x
3.625”W x
5.375”H
Max Gate Length 12 ft.
Max Gate Weight 300 lbs.
Cycles per hour 10
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Figure 1: Operator Specifications
Electrical, Line Connections
Incoming Line Voltage 115 VAC
Rated Current 1.4 Amps
Motor Voltage 24 VDC
Motor (2) Wattage 120 Watts (each)
Figure 2

4Product Information And Specs.
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POWER SUPPLY
The 24 DC operator requires 115 VAC power. The gauge wire depends on the distance run.
Consult your electrician to ensure a good power supply.
PROTECTION (See Figure 2)
Fuses for primary and secondary power:
1.6 Amp. 250V (line)
6.3 Amp 250V (control)
12 Amp. 250V (motor)
A varistor protects primary and secondary power over voltage. Operator torque control adjusts the
maximum output force of the operator (see Figure 13, Potentiometer #1).
CHARACTERISTICS
Solid state control panel allows the control of (2) 24 VDC, 120W actuators as follows:
Single button and Radio control command to: OPEN – STOP – CLOSE – STOP
Separate inputs for Open (with timer to close) and Stop
Timer to close built in
Safety input to stop the gate and to reverse the gate during closing cycle
Adjustable decel. speed, motor speed, motor power, and slave delay time
Electrical, Control Connections
The Eurostyle type connectors used in the LA405-24 control accept (2) stripped 16 gauge wires. Dry
contact control wires (no power) can fit more than (2) wires if smaller than 20 gauge wire is used.
Length is limited to 40 feet.

Preparations 5
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Preparations
Site Preparation
Using a licensed electrician, route power and control wires to the operator using appropriate conduit
and wire for your local code. Ensure gate swings freely and is level. Controls should be mounted
away from gate so people on the opposite side of the gate cannot reach through and start the gate
(see Figure 3).
NOTE: Plan gate location for accessories such as loops, photos eyes, etc. before beginning
installation.
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Flashing Light
Photo Eyes
Control Box with Antenna
12 foot, 300 pount
maximum gate
Pillar for mounting
operator
Operator
Keypad/
Cardreader
Figure 3: Typical Installation

6Preparations
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Site Layout
NOTE: For push to open only – position plate F as shown in Figure 4.
Plate F
Push to Open
(optional)
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Pull to Open
(typical)
Figure 4

Installation 7
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Installation
Mechanical
1 Attach plate “F” to the post so it is halfway between the ground and the
top of the gate. Refer to Figure 5.
2 Slide Plate “F” into bracket “H” and secure with bolt “E” and nut “G”.
3 When the gate is closed, attach plate “B” to the gate at the same height
as plate “F”.
4 Gate bracket “B” should be mounted approximately 23-1/4” from the gate
hinge point. The installed bracket must provide a level operation for the
operator.
5 Test the location before welding.
NOTE: When the gate is full open or full close, the unit should not
be at the end of its stroke.
01-G0399F21
Figure 5

8Installation
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Electrical
1. The electrical installation must meet national and local codes and should be performed by a
qualified electrician.
2. Read all manuals and safety instructions before beginning installation.
3. It is strongly recommended that safety equipment be used with this operator.
4. Power cables should be run in separate conduit from the control wiring.
5. Check all connections before applying power to units.
6. When voltage is supplied, the “Power” LED should be on.
7. If motor direction is not correct, reverse the open/close motor wires. Or as an alternate
method, you may also reverse the FCA-FCC limit switch wires.
8. The term “normally open” means that the contact points are open or apart until they are brought
together by electrical (radio receiver) or manual means (pushbutton).
9. The term “normally closed” means that the contact points are together or closed until opened
by electrical or manual means.
LINE POWER CONNECTIONS
1 Connect incoming line wires to the 3 pole terminal on control
board.
2 To attach power wires to the unit, remove the cover screw
holding black plastic power cover (see Figure 6).
This can be found in the lower right hand corner of the control
box.
3 Attach the “hot” (black), “neutral” (white) and “ground” (green)
wires as indicated on the control board. Figure 6
SAFETY DEVICES – (PHOTO EYES AND LOOP DETECTORS)
The LA 405-24 control box allows for (2) different safety inputs. The first uses terminals #1 and
#6; when activated it reverses a closing gate. The second type uses terminals #1 and #5; when
activated it stops the gate (will not open or close).
If gate was opening when obstruction occurred, once clear, the gate will continue to open. If gate
was closing when obstruction occurred, once clear, the gate will then begin reopening. Both
require connection to devices with normally closed contacts, which are opened when activated.
WARNING
Use of safety devices is recommended to prevent injury and entrapment.
STOP COMMAND
Mount a stop button near the gate. This allows the gate to be stopped in the case of an
emergency. A normally closed stop button suitable for exterior use should be used. The
connections for the stop button are #1 and #7.

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LOCKING DEVICES – (ELECTRICAL DEAD BOLT)
Locking devices may be used with the LA405-24 control panel. A 24V DC, 50W output is
maintained for 3 seconds when an open command is given. The terminal connections are #15
and #16.
RADIO CONTROLS AND SINGLE PUSH BUTTON STATIONS
Each control box comes pre-wired with a LiftMaster 412HM receiver. This receiver (or others) are
wired to terminals #1 and #2. Radio power is connected to terminals #17 (+) and #18 (-) for 24V
DC.
SAFETY EDGES
Electric gate edges are normally open devices. To wire an electric gate edge to a LA405-24
control panel, an auxiliary relay must be used. The procedure is a follows:
Attach one of the two electric gate edge wires to terminal #17
Attach the other wire to one of the coil terminals of a 24V DC relay (P/N 24-264-4)
Attach the remaining coil terminal to terminal #8
Attach the common and the normally closed contacts of the 24V DC relay to terminal #1
and #6
When the gate edge is contacted, the 24V DC relay will be energized causing an open circuit
between terminals #1 and #6.The gate operator will then reverse to the full open position.
KEYPADS/CARD READERS (See FIGURE 7)
Use terminal #1 and #3 for an open command only. The gate will time out and close if the timer
is activated.
Figure 7
AUDIO AND VISIBLE ALARMS
Warning devices may be used with the LA405-24 actuator. 24V DC, 50 W is supplied upon
opening and 3 seconds before closing. 24V DC, 50W warning devices are connected to
terminals #12 and #14.
When a safety command is received across terminals #1 and #5, actuator will stop but flasher will
continue until open or close limit switch is met.

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CONTROL CONNECTIONS
For each actuator, run (2) wires, 5 to 25 feet long of 14 gauge wire for power. Use (3) wires 16 to
20 gauge for the controls. If using (2) actuators, use motor cables of the same length and gauge
to ensure the motors run at the same speed.
NOTE: When actuator wiring is run to the bottom of the operator, mount using this hold
(!-- see Figure 8) to prevent plate from shearing cables.
01-g03099F22
Figure 8
WARNING
If operator does not stop in time, the plate may cut the cable.