Lift-Master SW420 User Manual

CONTROLLER BOARD

Serial # ________________________
(located on electrical box cover)

Installation Date __________________

2 YEAR WARRANTY

MODEL SW420 IS FOR VEHICULAR PASSAGE GATES ONLY AND IS

NOT INTENDED FOR PEDESTRIAN PASSAGE GATE USE

MODEL SW420

LIGHT DUTY SWING GATE OPERATOR

GL

2

OPERATOR SPECIFICATIONS

Carton Inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Gate Weight Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Operator Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Model Classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

OPERATOR WARNINGS

Gate System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Safety Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Safety Label Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Safety for Swing & Ornamental Grill Type Gates . . . . . . . . . . . . . . . . . .8

OPERATOR MOUNTING

Post Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Pad Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Pedestal Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

MECHANICAL OPERATOR FEATURES

Control Arm Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Mechanical Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

OPERATOR WIRING & PROGRAMMING

Install Power Wiring & Control Station . . . . . . . . . . . . . . . . . . . . . . . . .14

Wiring Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Disconnect Switch Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Stop/Reset Button Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Programming The Radio Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Limit Switch Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

SAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Optional Control Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19-20

Control Board Illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Controller Programming and Features . . . . . . . . . . . . . . . . . . . . . . . . .22

Program Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23-24

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25-26

Hall Effect Sensor Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Operator Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Repair Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Illustrated Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Single Phase Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32-34

Warranty Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Control Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

TABLE OF CONTENTS

IMPORTANT NOTE

• BEFORE attempting to install, operate or maintain the operator,
you MUST read and fully understand this manual and follow all
safety instructions.

• These instructions are intended to highlight certain safety related
issues. These instructions are not intended to be comprehensive.
Because each application is unique, it is the responsibility of the
purchaser, designer, installer and end user to ensure that the total
gate system is safe for its intended use.

CARTON INVENTORY

Before beginning your installation check that all components were
supplied and received undamaged. Refer to list below for factory
supplied parts.

Part No. Description Qty.

01-G0582 Safety Gate Brochure 1
02-401-SP Stop Button 1
07-2705 Arm Stop 1
10-2111 Gate Bracket 1
11-2754 U-Bolt Nut Tool 1
12-2727 Bushing 3/8" 3
40-3505 Warning Sign 2
80-10026 Washer, Shim 3/8" 2
80-206-65 Spacer 4
80-2754 U-Bolt Nut 2
82-HN38-16 Bolt 3/8-16 x 1" 1
82-HN38-18 Hex Head Bolt 3/8-16 2
82-SH37-10 Socket Head Bolt 3/8-24 1
85-FW-38S Flat Washer 3/8" 1

HARDWARE KIT
SW420 (K77-SW420)

WARNING

WARNING

WARNING

WARNING

CAUTION

WARNING

WARNING

Mechanical

Electrical

When you see these Safety Symbols and Signal Words on the following
pages, they will alert you to the possibility of serious injury or death if
you do not comply with the warnings that accompany them. The hazard
may come from something mechanical or from electric shock. Read the
warnings carefully.
When you see this Signal Word on the following pages, it will alert you
to the possibility of damage to your gate and/or the gate operator if you
do not comply with the cautionary statements that accompany it. Read
them carefully.

3

MODEL 420

HP
1/3

GATE WT.

300 LBS.

GATE WIDTH

12 FT.

MAX. STARTS/HR

10

GATE WEIGHT SPECIFICATIONS

OPERATOR DIMENSIONS

1-3/8"

11-3/4"

18-3/16"

Post Mount

(standard)

11-5/8"

3-3/16"

3" (Nominal)

14-5/8"

11-3/4"

12" Max.

1.38

1.38

18-3/16"

18-3/16"

Pad Mount

(optional)

Pedestal

Mount

(optional)

11-5/8"

3-3/16"

5/8"

11-5/8"

3-3/16"

1-1/2"

4

MODEL

SW420

CLASS 1 CLASS 2

CLASS 3

CLASS 4

✔✔✔✔

NOTE: Model SW420 meets the following specifications

CLASS I – RESIDENTIAL VEHICULAR GATE OPERATOR

A vehicular gate operator (or system) intended for use in a home of one-to four single family
dwellings, or a garage or parking area associated therewith.

CLASS II – COMMERCIAL/GENERAL ACCESS VEHICULAR GATE OPERATOR

A vehicular gate operator (or system) intended for use in a commercial location or building such
as a multi-family housing unit (five or more single family units) hotel, garage, retail store or other
building servicing the general public.

CLASS III – INDUSTRIAL/LIMITED ACCESS VEHICULAR GATE OPERATOR

A vehicular gate operator (or system) intended for use in a industrial location or building such as
a factory or loading dock area or other location not intended to service the general public.

CLASS IV – RESTRICTED ACCESS VEHICULAR GATE OPERATOR

A vehicular gate operator (or system) intended for use in a guarded industrial location or building
such as an airport security area or other restricted access locations not servicing the general
public, in which unauthorized access is prevented via supervision by security personnel.

UL325 MODEL CLASSIFICATIONS

5

This document is current with the UL325 specification at the time of printing. However please check the most current version of UL325 for update
information.

UL325 MODEL CLASSIFICATIONS continued

SAFETY ACCESSORY SELECTION

All UL325 compliant LiftMaster gate operators will accept external
entrapment protection devices to protect people from motorized
gate systems. UL325 requires that the type of entrapment
protection correctly matches each gate application. Below are the
six types of entrapment protection recognized by UL325 for use
on this operator.

ENTRAPMENT PROTECTION TYPES

Type A: Inherent obstruction sensing system, self-contained

within the operator. This system must sense and initiate
the reverse of the gate within two seconds of contact
with a solid object.

Type B1: Connections provided for a non-contact device, such as

a photo eye can be used as a secondary protection.

Type B2: Connections provided for a contact sensor. A contact

device such as a gate edge can be used for secondary
protection.

Type C: Inherent adjustable clutch or pressure relief valve.

Type D: Connections provided for a control requiring continuous

pressure to operate the operator open and close.

Type E: Built-in audio alarm. Examples

include sirens, horns or buzzers.

NOTE:

UL requires that all installations must
have warning signs placed in plain view on
both sides of the gate to warn pedestrians of
the dangers of motorized gate systems. Many
signs and labels are included with each
operator.

UL325 ENTRAPMENT PROTECTION REQUIREMENTS

The chart above illustrates the entrapment protection requirements
for each of the four UL325 classes.

In order to complete a proper installation you must satisfy the
entrapment protection chart shown above. That means that the
installation must have one primary means of entrapment protection
and one independent secondary means of entrapment protection.
Both primary and secondary entrapment protection methods must
be designed, arranged or configured to protect against entrapments
in both the open and close directions of gate travel.
For Example: For a gate system that is installed on a single-family
residence (UL325 Class I) you must provide the following: As your
primary type of entrapment protection you must provide

• Type A inherent (built into the operator) entrapment sensing and at
least one of the following as your secondary entrapment protection:

• Type B1- Non-contact sensors such as photo-eyes,

• Type B2- Contact sensors such as gate edges or

• Type D- Constant pressure control.

GATE OPERATOR ENTRAPMENT PROTECTION

Class

I & II

Class III

Class IV

A, B1, C

or D

A, B1, C,

D or E

A, B1, B2,

D or E

A, B1, B2

or D

A, B1, B2

or B2

A, B1,

D or E

A, B1, C

or C

A, B1, C,

or D, B2

A or C

B1, B2

or D

A

UL325 Slide Gate Operator Swing & Gate Barrier

Installation (Arm) Operator

Class

Primary

Type

Secondary

Typ e

Secondary

Type

Primary

Type

D or E

Moving Gate Can Cause

Injury or Death

KEEP CLEAR! Gate may move at any
time without prior warning.

Do not let children operate the gate or
play in the gate area.
This entrance is for vehicles only.
Pedestrians must use separate entrance

6

* REFER TO LOOP MANUFACTURER’S INSTRUCTIONS FOR DETAILED INSTALLATION & LOOP WIRING INSTRUCTIONS.

GATE SYSTEMS

MASTER/SECOND SWING GATE

COMMERCIAL SWING GATE

STREET

Interrupt
Loop

Telephone
Entry
System

Photo eye for
open cycle

Run twisted wire
from loop
to operator

Seal Loops

Photo eye for
open cycle

STREET

Interrupt
Loop

Shadow
Loop

4'

Typical

Interrupt
Loop

Photo eye for
open cycle

COMPLEX

OR

PARKING LOT

Master
Unit

1-1/2"

Loop wire
layer

1/4" or larger
depending on loop
wire size

Run twisted wire
from loop
to operator

Seal Loops

Second
Unit

Photo eye for
open cycle

Photo eye for
open cycle

Shadow
Loop

Typical

Interrupt
Loop

4'

COMPLEX

OR

PARKING LOT

1-1/2"

Loop wire

layer
1/4" or larger
depending on loop
wire size

7

1. Vehicular gate systems provide convenience and security. Gate systems are comprised of many component parts. The gate
operator is only one component. Each gate system is specifically designed for an individual application.

2. Gate operating system designers, installers and users must take into account the possible hazards associated with each individual
application. Improperly designed, installed or maintained systems can create risks for the user as well as the bystander. Gate
systems design and installation must reduce public exposure to potential hazards.

3. A gate operator can create high levels of force in its function as a component part of a gate system. Therefore, safety features
must be incorporated into every design. Specific safety features include:

• Gate Edges • Guards for exposed rollers • Photoelectric Sensors • Screen Mesh

• Enclosed Track • Vertical Posts • Instructional and Precautionary Signage

4. Install the gate operator only when:
a. The operator is appropriate for the construction and the usage class of the gate.
b. All openings of a horizontal swing gate are guarded or screened from the bottom of the gate to a minimum of

4' (1.2 m) above the ground to prevent a 2 1/4" (57.15 mm) diameter sphere from passing through the openings anywhere in
the gate, and in that portion of the adjacent fence that the gate covers in the open position.

c. All exposed pinch points are eliminated or guarded, and guarding is supplied for exposed rollers.

5. The operator is intended for installation only on gates used for vehicles. Pedestrians must be supplied with a separate access
opening.

6. The gate must be installed in a location so that enough clearance is supplied between the gate and adjacent structures when
opening and closing to reduce the risk of entrapment. Swinging gates shall not open into public access areas.

7. The gate must be properly installed and work freely in both directions prior to the installation of the gate operator.

8. Controls must be far enough from the gate so that the user is prevented from coming in contact with the gate while operating the
controls.

9. Controls intended to be used to reset an operator after 2 sequential activations of the entrapment protection device or devices
must be located in the line of sight of the gate, or easily accessible controls shall have a security feature to prevent unauthorized
use.

10. All warning signs must be installed where visible, on each side of the gate.

11. For a gate operator utilizing a non-contact sensor:
a. See instructions on the placement of non-contact sensor for each type of application.
b. Care shall be exercised to reduce the risk of nuisance tripping, such as when a vehicle trips the sensor while the gate is still

moving.

c. One or more non-contact sensors shall be located where the risk of entrapment or obstruction exists, such as the perimeter

reachable by a moving gate or barrier.

12. For a gate operator utilizing a contact sensor such as an edge sensor:
a. One or more contact sensors shall be located at the leading edge, trailing edge and post mounted both inside and outside of a

vehicular horizontal slide gate.
b. One or more contact sensors shall be located at the bottom edge of a vehicular vertical lift gate.
c. One or more contact sensors shall be located at the pinch point of a vehicular vertical pivot gate. Additionally, if the bottom

edge of a swing gate is greater than 6" (152mm) above the ground at any point in its arc of travel, one or more contact sensors

shall be located on the bottom edge.
d. A hard wired contact sensor shall be located and its wiring arranged so the communication between the sensor and the gate

operator is not subject to mechanical damage.
e. A wireless contact sensor such as the one that transmits radio frequency (RF) signals to the gate operator for entrapment

protection functions shall be located where the transmission of the signals are not obstructed or impeded by building

structures, natural landscaping or similar obstruction. A wireless contact sensor shall function under the intended end-use

conditions.

SAFETY INSTALLATION INFORMATION

8

Injuries can occur when pedestrians stand in the path of a moving gate, or in their entrapment zones. Non-contact sensors,
such a photo eyes, must be incorporated into the swing gate system to assist in the protection of people who may come
near the gate operating system. Gate edges maybe used as additional entrapment protective devices.

UL325 requires that, when used, contact sensors shall be located so that they protect against entrapment during both open
and close gate cycles.

The UL required Warning Signs must be installed in plain view and on both sides of each gate installed. Each sign is made
with fastening holes in each corner and should be permanently secured in a suitable manner. Warning label on unit should
be visible.

Injuries occur when people are caught between a moving gate or a rigid object such as a stationary fence post or fence
(See Safety Brochure for details).

SAFETY LABEL PLACEMENT

SAFETY PRECAUTIONS FOR SWING & ORNAMENT “GRILL TYPE” GATES

Moving Gate Can Cause

Injury or Death

KEEP CLEAR! Gate may move at any
time without prior warning.

Do not let children operate the gate or
play in the gate area.

This entrance is for vehicles only.
Pedestrians must use separate entrance

01-G0665F18

NOTE: For the following instructions refer to Figures 1 & 2.

1. Locate and anchor two posts made of 3" outer diameter heavy
walled pipe. Posts should be parallel and square to the gate.

IMPORTANT NOTE: The distance between mounting posts and the
relative location of the operator to the gate and fence is critical.

2. Locate electrical conduit, as required, prior to pouring concrete.

3. Locate post mount holes on each end of the cabinet. There are (3)
sets of holes vertically.

The preferred method of post mounting is to use the (2) sets of holes
nearest to the rear side of the cabinet. Knock out the post mount holes
that have been selected.

NOTE: The preferred method of post mounting is to use the (2) sets of
holes nearest to the rear side of the cabinet. If mentioned holes are
used, the upper rear holes are larger than the other holes. This is
because a special nut is required for the U-bolt in these holes due to an
inaccessibility of tools inside the cabinet in the area of these holes.

4. Insert the U-bolt Nut (80-22754) through the cabinet wall from the
inside and onto the leg of the U-Bolt. This nut can be tightened with a
wrench from outside the cabinet. A special tool is provided for this
purpose.

Figure 1

Figure 2

POST MOUNTING

9

Gate

Gate

Pivot

Pivot

5-3/8"

11"

3"

Parallel Mount

16"

18-1/4"

Fence Line

28"

21-1/4"

3" Pipe

18 1/4"

Fence Line

17-3/8"

21-1/4"

3" U-bolt
(4 required)

Perpendicular Mount

Use tool provided
(11-2754) to insert
special nut in rear
holes.

Rear of cabinet

Special Nut

Power and control wiring
should be run in separate conduit

10

NOTE: For the following instructions refer to Figures 1 & 2.

1. Layout the concrete pad as detailed in Figure 1.

IMPORTANT NOTE: The relative location of the operator to the fence
and the gate is critical. Be sure that the measurements for operator
mounting are taken from the centerline of the fence and of the gate
hinge.

2. Locate electrical conduit, as required, prior to pouring concrete.

3. Pour concrete pad.

4. Bolt the (2) pad mount brackets to the bottom of the operator with the
hardware provided.

5. Secure the operator to the pad. It is very important that the operator
be level and square to the gate.

Figure 1

Figure 2

PAD MOUNTING

Pivot

Gate

18"x30" Pad
Minimum

1/2" red head bolts
or anchors

Pivot

Gate

Fence Line

6-1/2"

19"

26-3/4"

6"

Parallel Mount

Fence Line

14-3/4"

6"

18-1/2"

19"

Perpendicular Mount

Using suitable
hardware secure
operator to L-bolts

1/2" concrete anchoring
bolts (4 required)

Power and control wiring
should be run in seperate conduit

Concrete Pad

2" to 4"
above grade

Depth required
by local codes or
below frost line

Hardware
Typ. (6X)

Pad Mount Bracket

11

NOTE: For the following instructions refer to Figures 1 & 2.

1. Locate and anchor pedestal. Pedestal should be parallel and square
to the gate.

IMPORTANT NOTE: The distance between mounting pedestal and the
relative location of the operator to the gate and fence is critical.

2. Locate electrical conduit, as required, prior to pouring concrete.

3. Bolt the mounting brackets to the pedestal.

4. Secure the operator to the pedestal by dropping it onto the pedestal
and allowing the mounting studs to slip through the holes on the
pedestal brackets. Secure with hex nuts provided.

Figure 1

Figure 2

PEDESTAL MOUNTING

Pivot

Gate

Pivot

Gate

Pedestal 24" deep
in-ground minimum

Hinge Pin

14"

Fence Line

26"

Parallel Mount

Hinge Pin

14"

Fence Line

26"

Perpendicular Mount

Pedestal mount
Kit 65RSWP

Power and control wiring
should be run in seperate conduit

Concrete Pad

2" to 4"
above grade

Depth required
by local codes or
below frost line

Nut Typ. (8x)

Bolt typ. (4x) from
bracket to pedestal

1. Assemble the control arm to the operator hub.

2. Push up the manual release pin from below the hub and through the
control arm. Retain in place with clevis pin. Use 3/8" washers to
reduce play between the clevis pin and the top of the control arm.

3. When the manual release pin is allowed to drop down, the control
arm should swivel freely about the hub. Leave the arm free to pivot at
this time.

4. Fasten the arm stop to the extension arm. Left hand or right hand
installations call for mounting the arm stop on opposite sides of the
extension arm.

5. Assemble the extension arm to the control arm using the hardware
provided.

6. Assemble the gate bracket to the extension arm as shown.

7. Put the gate in the fully closed position and extend the arm assembly
out to the closed gate. Mark the point on the gate where the gate
bracket will mount to the gate.

8. The gate bracket must be installed on a structural member of the
gate. If require, install a horizontal support on the gate at the
appropriate height.

9. Attach the gate bracket with U-bolts or by welding.

Figure 2

WARNING

WARNING

WARNING

If the arm stop is installed incorrectly, the gate will be
prevented from opening and damage to the operator may
result!

Figure 1

12

CONTROL ARM ASSEMBLY

Arm Kit
K75-18626

CAUTION

Gate Bracket
Bolt Kit

Extension Arm

K75-18623

(As Required)

Gate

Gate Bracket

Arm Stop
(Right Open)

Control Arm

Drive Hub
on Operator

Drive Hub
Disconnect Kit
K75-18625

36-1/2"
(Approximately)

Extension Arm

Gate Bracket

Arm Stop
(Left Open)

Arm Stop Kit
K75-18624

Hinge Pin

Fence

16"

33-1/2"

Arm Stop

26"

Control
Arm

28"

Operator Shaft

13

The operator can be disconnected from the gate, so the gate can be manually opened or closed. Disconnect the control arm from the drive hub by
removing the hairpin cotter and then the clevis pin and allowing the manual release pin to drop down through the hub. The arm should now be free
and the gate can be opened and closed normally.

NOTE: If desired, a padlock can be used in place of the clevis pin to hold the manual release pin in place.

Figure 1

MECHANICAL DISCONNECT

Control Arm

Clevis Pin

Drive Hub

Hairpin Cotter

Release Pin

14

DISCONNECT power at the fuse box BEFORE proceeding.
Operator MUST be properly grounded and connected in

accordance with local electrical codes.

NOTE:

The operator

should be on a separate fused line of adequate capacity.

ALL electrical connections MUST be made by a qualified
individual.

ANY maintenance to the operator or in the area near the
operator MUST not be performed until DISCONNECTING the
electrical power and locking-out the power via the operator
power switch. Upon completion of maintenance the area
MUST be cleared and secured, at that time the unit may be
returned to service.

NOTE: Calculated using NEC guidelines. Local codes and conditions must be reviewed for suitability of wire installation.

NOTE: All power wiring should be dedicated and protected. Location of primary power disconnect should be labeled.

WARNING

Do not install any wiring or attempt to run the operator
without consulting the wiring diagram. We recommend that
you Install an optional reversing edge before proceeding with
the control station installation.

WARNING

BEFORE installing power wiring or control stations be sure to
follow all specifications and warnings described below. Failure
to do so may result in SEVERE INJURY to persons and/or
damage to operator.

ON A DUAL GATE SYSTEM EACH UNIT MUST BE INSTALLED ON SEPARATE CIRCUITS

INSTALL POWER WIRING & CONTROL STATION

WIRING SPECIFICATIONS

SINGLE PHASE

115 Vac 230 Vac

WIRE GAUGE 6

 1/3 HP Motor –––––––– 615ft. 3077ft.

WIRE GAUGE 8

 1/3 HP Motor –––––––– 432ft. 1942ft.

WIRE GAUGE 10

 1/3 HP Motor –––––––– 271ft. 1218ft.

WIRE GAUGE 12

 1/3 HP Motor –––––––– 170ft. 763ft.

WARNING

WARNING

WARNING

WARNING

15

SINGLE PHASE

NOTE: Before running power wiring refer to wiring specifications on
page 14 for correct wire gauges.

Secure all electrical power connections inside the disconnect switch
electrical box. Refer to electrical wiring diagram on page 31.

1. This control will function as a Stop/Reset command and is to be
wired within line of sight of the gate. The operator will not function

unless this circuit is completed.

2. Wire control station to terminals 3 and 5 in the control box on the
operator.

FIELD

WIRING TERMINALS

STOP/RESET
Button

Control Conduit

All single phase operators will have the following:

115V 208/230V

 L1 (NEUTRAL), WHITE  L1 (HOT), BLACK
 L2 (HOT), BLACK  L2 (HOT), BLACK
 GROUND, GREEN  GROUND, GREEN

STOP/RESET BUTTON CONTROL WIRING (REQUIRED)

DISCONNECT SWITCH POWER WIRING

ON/OFF Switch

Cover

Wire Nut Connections
(See Instructions)

Power Wiring Conduit

STOP/RESET BUTTON WIRING

R1 R2 R3 R4 3 5

STOP/RESET

16

SET SECURITY MODE

The Universal Receiver can be used with up to 15 rolling code
transmitters or passwords in HIGH security mode. Alternately, it can be
used with up to 31 of any type transmitter in NORMAL security mode,
including any combination of rolling code, billion code, or dip switch
remotes.
The jumper must be set at the HIGH position for the receiver to operate
in HIGH security mode. It must be set at NORMAL position to operate at
the NORMAL mode (Figure 1).
When changing from NORMAL to HIGH security mode, any previous
transmitter codes must be erased. Repeat Steps 2 and 3 in the
Programming Section below to reprogram the receiver for each remote
control transmitter in use.
The receiver is factory set at HIGH.

SET OUTPUT DURATION

For commercial applications, the receiver can be set for either
constant or momentary closure on the output contacts. Use of
constant closure is prohibited on residential garage door
openers because it overrides the safety reversal devices.

With the jumper in the “M” (Momentary) position, the contacts will close
for 1/4 second regardless of the length of radio transmission. With the
jumper in “C” (Constant) position, the contacts will stay closed as long
as the radio continues transmitting (Figure 2).
The receiver is factory set at M.

PROGRAMMING THE REMOTE TO THE RECEIVER

1. Pry open the front panel of receiver case with a coin or a screwdriver.
Re-connect power to opener (Figure 3).

2. Press and release the “learn” button on the receiver. The learn
indicator light will glow steadily for 30 seconds.

3. Within 30 seconds, press and hold the button on the hand-held
remote that you wish to operate your garage door.

The opener will now operate when the push button on either the
receiver or the remote control transmitter is pressed.
Repeat Steps 2 and 3 for each remote control that will be used to
operate the garage door opener.
To erase all remote control codes
Press and hold the “learn” button on the receiver panel until the
indicator light turns off (about 6 seconds). All transmitter codes are now
erased. Then follow the steps above to reprogram each remote control.

To prevent possible SERIOUS INJURY or DEATH from
electrocution:

• Be sure power is not connected BEFORE installing the
receiver.

To prevent possible SERIOUS INJURY or DEATH from a moving
gate or garage door:

• ALWAYS keep remote controls out of reach of children.
NEVER permit children to operate, or play with remote control
transmitters.

• Activate gate or door ONLY when it can be seen clearly, is
properly adjusted, and there are no obstructions to door
travel.

• ALWAYS keep gate or garage door in sight until completely
closed. NEVER permit anyone to cross path of moving gate or
door.

WARNING

To prevent possible serious injury or death, the use of
CONSTANT OPERATION on residential openers is PROHIBITED.

WARNING

NOTICE: To comply with FCC and or Industry Canada (IC) rules, adjustment or modifications of
this receiver and/or transmitter are prohibited, except for changing the code setting or replacing
the battery. THERE ARE NO OTHER USER SERVICEABLE PARTS.

Tested to Comply with FCC Standards FOR HOME OR OFFICE USE. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired operation.

Figure 1

Figure 2

Figure 3

PROGRAMMING THE RADIO RECEIVER

WARNING

WARNING

Security Mode
Terminals

Jumper

HIGH

SECURITY MODE

Security Mode
Terminals

Jumper

NORMAL

SECURITY MODE

CONSTANT

OPERATION

Output
Duration
Terminals

Jumper

M

MOMENTARY

OPERATION

Output
Duration
Terminals

Jumper

M

OPENING RECEIVER

Indicator Light

Connect

Antenna

OPEN RECEIVER

Learn Button

C

P2

M

HIGH

NORM

12V

24V

Output Duration
Terminals

Security Mode
Power Supply

Jumper

WARNING

WARNING

WARNING

NEVER place hands or tools inside operator or near drive
mechanism unless power is off.

NOTE: For limit location and configuration refer to Figure 1

1. Before turning on power, disconnect extension arm from gate bracket
so gate is no longer connected to operator. Push manual release pin
up through the control arm, slide clevis pin in place and secure with
a cotter pin.

2. The (3) collars are held to shaft by set screws.The collars should
now be loose on the shaft. If not, loosen all set screws until collars
are moving freely on shaft.

TO ADJUST CLOSE LIMIT SWITCH

3. Turn on electrical power.

WARNING

WARNING

WARNING

When following limit switch adjustment procedure, the motor
belt will turn and the control arm will move during some
steps. Keep hands and tools out of operator and away from
arm and drive shaft unless power is off or serious injury may
occur.

WARNING

WARNING

WARNING

Be aware that operator arm may start to move if a control
device has been improperly connected. Keep hands and tools
out of operator and away from arm and drive shaft.

4. Press CLOSE button (if installed) or connect terminals 4 & 5 on J1
terminal strip to cause the gate to close. The control arm should
move in the close direction.

5. When control arm is pointed in approximate direction of gate bracket
(on fully closed gate) press STOP button or release terminals to stop
control arm.

NOTE: If control arm does not move far enough to point in proper
direction, the close limit switch has been prematurely actuated. Turn off
power, loosen set screw on close limit cam and rotate nut away from
close limit switch. Repeat steps 3 & 4 until control arm is pointed in
correct direction.

DIRECTION OF

GATE TO OPEN

RIGHT

LEFT

OPEN

LIMIT

A

B

CLOSE

LIMIT

B

A

LIMIT DIRECTION

Figure 1

6. Turn off power. Be sure close limit cam is freely turning. Rotate cam
in close direction. Stop when cam just clicks close limit switch.
Tighten set screw.

7. Reconnect gate bracket to extension arm. If arm has moved too far in
close direction to allow connection of gate bracket turn off power,
connect terminals 5 & 7 to rotate arm in opposite direction, and press
STOP button when arm is in desired position.

TO ADJUST OPEN LIMIT SWITCH

8. Turn on power. Press OPEN button (if installed) or connect terminals
5 & 7 on J1 terminal strip. Gate should open. If gate does not open
the open limit cam may be already actuating open limit switch or an
improper electrical connection may have been made. Turn off power,
inspect, correct and repeat this step.

9. When gate reaches desired fully open position press STOP button or
release terminals. Turn off power. Limit cam should turn freely.
Rotate cam in open direction. Stop when cam just clicks the open
limit switch. Tighten set screw.

10. Fine tune both switch settings by using J1 terminals 4 & 5 (to

CLOSE) of 5 & 7 (to OPEN) and the factory supplied STOP button
to move gate and rotating limit collars slightly to alter gate travel.
Rotate cam away from limit switch to increase travel, toward switch
to decrease travel.

LIMIT SWITCH ADJUSTMENT

17

CAUTION

CAUTION

Auxiliary
Open Limit
Cam & Collar

Limit Switch A

CAUTION

Limit A
Cam & Collar

Limit B
Cam & Collar

Limit Switch B

18

Figure 1

SAMS DEFINITION

The Sequenced Access Management System or SAMS allows the customer more control when managing vehicular entrances to areas such as
apartment complexes, businesses and gated communities. The basic concept of the system is that traffic is controlled by two gates installed in
tandem, a fast moving gate such as a barrier gate operator and a slower moving more secure or ornamental gate such as a single or pair of
slide/swing gate operator. The design of this gate system balances the demands of speed during high traffic periods with security during low traffic
periods. Barrier gates typically have the fastest open times of the many gate operator types and the slide or swing gates allow you to effectively
seal off the perimeter of the complex you are planning to secure.

NOTE: Connect all entry devices to the slide or swing gate. If using a device, such as a 7-day timer, to latch the slide or swing gate open during
high traffic times, connect the device’s N/O relay output to the GL board’s Interrupt Loop input. Once the device activates the Interrupt Loop input,
the next vehicle to access the SAMS system will lock the gate in the open position until the device deactivates. When the device deactivates, the
timer to close will automatically close and secure the gate.

SAMS OPERATION

1) When an authorized vehicle accesses the gate system, the SAM
system responds by first opening the gate farthest from the vehicle,
the swing or slide gate.

2) Once the swing or slide gate is open, the barrier gate begins its
open cycle.

3) Once the barrier is open the vehicle may pass through the SAM
system. At this point you have two options in how you would like to
initiate the SAM systems closure. You may chose to:

a) Use a timer to close system to automatically close the barrier gate

after a preset amount of time or

b) Use a loop system to close the barrier gate after the vehicle has

passed through the SAM system.

4) Once the barrier gate is closed the slide or swing gate will activate
its internal timer to close and begin closing.

5) If another authorized vehicle accesses the SAM system before the
slide or swing begins to close the barrier will open and allow the
vehicle to pass through the SAM system.

6) If another authorized vehicle accesses the SAM system during the
slide or swing gates closing cycle the SAM system will reopen the
slide or swing gate. Once the slide or swing gate reaches the open
position the barrier will then open to allow the vehicle to pass
through the SAM system.

7) If no other authorized vehicles access the SAM system the swing or
slide gate will close followed by the barrier.

SAMS WIRING

1) Install conduit between the BG770 and the SW420 for SAMS control
wiring.

2) Run a 4-conductor cable in the conduit between the BG770 SW420.

3) Locate the SAMS relay terminals (J5) on the GL board in the SW420
and locate the auxiliary limit switch in the BG770.

4) Attach a wire from the SAMS relay terminal (J5) on the GL board to
terminal 1 on the BG770 terminal strip.

5) Attach a wire from the SAMS relay terminal (J5) on the GL board to
terminal 3 on the BG770 barrier gates terminal strip.

6) Attach a wire from terminal J1-5 on the GL board to the common
(COM) on the auxiliary limit switch in the barrier gate.

7) Attach a wire from terminal J1-8 on the GL board to the normally
open (NO) on the auxiliary limit switch.

8) Test for correct functionality of the SAM system.

SAMS (SEQUENCED ACCESS MANAGEMENT SYSTEM)

Field Wiring Terminals

Interrupt Loop Input

TB5

TB8

SAMS Relay At J5

N/O

COM

BG770 Barrier Gate

Auxiliary Limit Switch

N/O
COM

Terminal Strip

1 (OPEN)

3 (COMMON)

SAMS
Conduit

TRAFFIC

BG770

STREET

Second
Unit

Hold Open Loop

Photo eye for
open cycle

BG770

8'

Typical

Shadow
Loop

4'

Typical

Interrupt Loop

Photo eye for
open cycle

Master Unit

COMPLEX

OR

PARKING LOT

All inputs are normally open and momentary, except the stop (N.C.). The following instructions are based upon UL325, and include
recommendations for significant increase in safety.

We strongly recommend that you follow the UL guidelines presented throughout the manual. Refer to instructions shipped with optional control
devices for mounting, wiring, programming and adjustment.

J1 Terminals 1 & 5 - Residential Radio (single button) Input

These terminals are intended for use with a radio receiver in a
residential application or as a single button control. This allows the user
to open the gate by activating the transmitter when the gate is closed
or between limits. This input also gives the user the ability to close the
gate by activating the transmitter when the gate is on the open limit.

J1 Terminals 2 & 5 - Shadow Loop Input

These terminals are intended for use with a loop detector and is
primarily used on swing gate operators. This input protects cars by
preventing the gate from moving off of the open or close limit when
the shadow loop input is active.

J1 Terminals 6 & 5 - Soft Open

These terminals are intended for use as a general open control.
Accessories that may be wired to this input include: Telephone Entry
Systems, Radio Receiver (Commercial Applications), Exit Loop
Detector, Keypads, 7-Day Timer.

Note: Will not override a double entrapment (signalled by the gate
stopped and entrapment alarm on).

Field Wiring Terminals 8 & 5 - Interrupt (Safety) Loop Input

These terminals are intended for use with a loop detector.This input
functions to reverse a closing gate to the open limit. Latching this input
will reset the timer to close.

24Vac Accessory Power-

Can be found at terminals R1 & R2 located on radio terminal block.

OPTIONAL CONTROL DEVICES

19

3

6

9

#

2

5

8

0

1

7

Field Wiring Terminal Blocks

R1 R2 R3 R4 3 5

J1 Terminal Block

1 2 3 4 5 6 7 8 9 10111213141516

589101112

SW420

Operator

R1

R2

R3

R4

24 Vac

GL Board

RESIDENTIAL RADIO (SINGLE BUTTON) INPUT

12345678910111213141516

SHADOW LOOP INPUT

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

SOFT OPEN

12345678910111213141516

F

R

EQ

F

R

E

Q

INTERRUPT (SAFETY) LOOP INPUT

589101112

FR
E

Q

20

Field Wiring Terminals 9 & 5 - Obstruction Open (Edge/ Photo
Eye Input)

Edge Input: See Programming Section

This input will reverse an opening gate to the close limit. Activating this
input when the gate is closing will have no effect. Note: If upon

reversal a second seperate obstruction is detected (gate edge or
R.P.M. sensor), gate will stop & alarm.

Photo Eye Input: See Programming Section

This input will pause an opening gate. Once the input (photo eye) is
cleared, the gate continues to open. Activating this input when the gate
is closing will have no effect.

Field Wiring Terminals 10 & 5 - Obstruction Close (Edge/ Photo
Eye Input)

Edge Input: See Programming Section

This input will reverse a closing gate to the open limit.When reaching
the open limit the timer to close, if enabled, will be disabled until
another command is given. Activating this input when the gate is
closing will have no effect. Note: If upon reversal a second seperate

obstruction is detected (gate edge or R.P.M. sensor), gate will stop
& alarm.

Photo Eye Input: See Programming Section

This input will reverse a closing gate to the open limit.This input will not
affect the timer to close. Activating this input when the gate is closing
will have no effect.

Field Wiring Terminals 3 & 5 - Stop/Reset Control Input

These terminals are intended for use with a single stop/reset button or
the stop control of a three-button station that is installed within line of
site of the gate. This input functions to stop the gate or to reset the gate
after an entrapment fault. Note: This input uses a normally closed

circuit and the operator will not run until a stop control is
installed.

J1 Terminals 4 & 5 - Hard Close Control Input

These terminals are intended for use only with the close control of a
three-button station that is installed within line of sight of the gate. A
momentary activation of this input will cause the gate to close.

Activation of this input for longer than three seconds will enable
the control to be used as a constant pressure override device. This

will allow the user, in emergencies, to override a failed accessory such
as a loop detector or photo-eye.

J1 Terminals 7 & 5 - Hard Open Control Input

These terminals are intended for use only with the open control of a
three-button station that is installed within line of sight of the gate. A
momentary activation of this input will cause the gate to open.

Activation of this input for longer than three seconds will enable
the control to be used as a constant pressure override device. This

will allow the user, in emergencies, to override a failed accessory such
as a loop detector or photo-eye.

STOP

CLOSE

OPEN

OPTIONAL CONTROL DEVICES

OBSTRUCTION OPEN (EDGE/PHOTO EYE INPUT)

589101112

OBSTRUCTION CLOSE (EDGE/PHOTO EYE INPUT)

589101112

STOP/RESET CONTROL INPUT

R1 R2 R3 R4 3 5

HARD CLOSE CONTROL INPUT

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

HARD OPEN CONROL INPUT

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

O

P

E

N

C

L

O

SE

S

T
O

P

O

P

E

N

C

L

O

SE

S

T

O

P

O

P

E

N

C

L

O

SE

S

T
O

P

21

CONTROL BOARD ILLUSTRATION

J4 Connector
Master/Second

J2 Connector

J5 Connector
SAMS

J1 Connector

Relay Drive
Troubleshooting LEDs

J1 Terminal
Troubleshooting LEDs

Dip Switch #4
Master/Second

Potentiometer
Timer to Close

Potentiometer
Force Adjustment

Dip Switch #2

Dip Switch #1

Diagnostic
LED

Limit
LEDs

Programming
Port
(factory use only)

Motor Learn
Button

J3 Connector
Aux. Relay Drive
(not used)

22

MOTOR LEARN FUNCTION (FORCE PROFILE)

This function is preprogrammed at factory. If either board or motor is replaced, the controller will
need to be programmed to “LEARN” the specific motor RPM profile of your operator. Switch “S3” is
provided for this.This is important for accurate force control. Failure to do so may result in improper
and unsafe operation.

To learn the motor:

NOTE: Motor Learn must be performed in stand alone mode.

1. Detach the unit from the gate, the motor needs to be learned without a load.

2. Press the motor learn button. The yellow LED should start to flash rapidly.

3. Install a jumper on either the hard open or the hard close input terminals. The motor will run for a
few seconds and then stop. If the LED goes out the motor is learned. If the unit activates a limit
before completing the learn or some other error occurs the LED will go back to on continuously.
If this happens try learning while running in the opposite direction.

NOTE: It is important that the jumper is in constant contact while the gate is moving
in learn mode.

4. Reconnect the unit to the gate, reset the limits and adjust the force control.

FORCE CONTROL

Set the force control pot such that the unit will complete a full cycle of gate travel but can be
reversed off an obstruction without applying an unreasonable amount of force. On most operators
this will be around the middle of the range.

MOTOR LEARN BUTTON

Motor Learn
Button

FORCE CONTROL

Force
Adjustment

* HARD INPUTS INCLUDE HARD OPEN, CLOSE AND STOP

INPUTS.

NOTE: For LED location refer to illustration on previous page.

CONTROLLER PROGRAMMING AND FEATURES

DIAGNOSTICS (LEDS AND CODES)

There are three diagnostic LEDs. Two red LEDs (OL, CL) are indicators
for the open and close limits.The LEDs are illuminated when the limit
switch contacts are closed.

The third amber LED (DIA) is used to blink out diagnostic codes. The
number is the count of the number of times the LED is on in an 8
second period. The LED is on for approximately 1/2 second and
repeats every second until the number is reached. There will be a
pause following each pulse cycle (1-6 pulses) to differentiate between
the different diagnostic codes.

TROUBLESHOOTING LEDS

There are 9 troubleshooting LEDs (D11, D13, D15, D17, D19, D21,
D24, D29, D31).

RELAY DRIVE TROUBLESHOOTING LEDS

There are 5 troubleshooting LEDs (D2, D3, D4, D5, D6) on relay drives
K1 through K5. These LEDs will be illuminated when the microcontroller
relay drive is activated.

Less

More

Sensitivity

LED CODE

FLASHED

OFF

1
2
3
4
5

6

ON

NO FLASH

Loss of communications between master and

DIAGNOSTIC

MEANING

Normal operation. N/A

Single entrapment sense. Control Input

Double entrapment sense. Hard Input*

Failed or no hall effect sensor. Removal of problem.

Exceed maximum motor run time. Hard Input*

Limit fault. Control Input*

second during run mode.

Motor not learned.

CLEARED BY

Removal of problem.

Completion of motor

Learn Routine

LED NAMELED DESCRIPTION
D11
D13
D15
D17
D19
D21
D24

D29
D31 On when edge is activated or when photo eye beam is broken.

D6
D5

D4
D3
D2 On when Alarm Relay is activated.

RADIO On when radio switch activated.

SHADOW On when shadow loop is activated.

HARD CLOSE On when hard close switch is activated.

STOP On when stop switch is not activated.

SOFT OPEN On when soft open switch is activated.

HARD OPEN On when hard open switch is activated.

INT. LOOP On when interrupt/safety loop activated.
OBS. OPEN On when edge is activated or when photo eye beam is broken.

OBS. CLOSE

LED NAMELED DESCRIPTION

CONT A On when CONTACTOR A activated.
CONT B On when CONTACTOR B activated.

SAM On when Sam Relay is activated.

LOCK On when Mag Lock Relay is activated.

ALARM

23

TIMER TO CLOSE ENABLE

This switch (S1-1) enables the auto close timer. The timer to close
feature works in conjunction with the potentiometer located on the
board.

SLIDE/SWING

This switch (S1-2) selects slide or swing gate operation, in order to
optimize gate behavior for specific application.

SL = Slide
SW = Swing

RIGHT/LEFT OPERATION

This switch (S1-3) selects the gate opening direction, to the left or to
the right. Right/Left operation is determined from the inside of fence
looking out.

SAVE MODE

This switch (S1-4) stores S1, S2 and S4 DIP switch settings into
memory & locks out changes.

NOTE: For any programming changes to take effect this switch must be
in OFF position.

MAGLOCK ENABLE

This switch (S2-1) enables the Maglock feature. On an open command
there will be a half second delay after the maglock relay is released
before the motor starts.

WARNING ENABLE

This switch (S2-2) enables the gate “in motion” alarm feature. The
alarm will beep 3 seconds prior to movement and throughout
movement.

TIMER TO CLOSE

Timer To Close Adjustment

NOTE: For all S1, S2 and S4 switch settings to take effect, the Save Mode must be set to the off position.

PROGRAMMING SETTINGS (DIP SWITCH #1)

PROGRAMMING SETTINGS (DIP SWITCH #2)

TIMER TO CLOSE

ENABLED

TTC

ON

1 2 3 4

SAVE

RT LT

SW SL

S1

ON

TIMER TO CLOSE

DISABLED

TTC

ON

1 2 3 4

SAVE

RT LT

SW SL

S1

ON

SWING

TTC

RT LT

SW SL

ON

1 2 3 4

RIGHT

TTC

RT LT

SW SL

ON

1 2 3 4

SAVE

S1

ON

SAVE

S1

ON

30
Seconds

SLIDE

TTC

RT LT

SW SL

ON

1 2 3 4

LEFT

TTC

RT LT

SW SL

ON

1 2 3 4

180
Seconds

0

SAVE

S1

ON

SAVE

S1

ON

LOCKED

TTC

ON

1 2 3 4

MAGLOCK ENABLED MAGLOCK DISABLED

S2

ON

ON

WARNING ENABLED WARNING DISABLED

MAG

S2

ON

ON

1 2 3 4

SAVE

RT LT

SW SL

WARN

MAG

1 2 3 4

WARN

S1

ON

CLED PH

OPED PH

CLED PH

OPED PH

UNLOCKED

TTC

ON

1 2 3 4

S2

ON

MAG

S2

ON

ON

1 2 3 4

RT LT

SW SL

WARN

MAG

ON

1 2 3 4

WARN

OPED PH

SAVE

S1

ON

CLED PH

OPED PH

CLED PH

24

Figure 1

EDGE/PHOTO OPEN

This switch (S2-3) selects edge or photo sensor for the gate opening
protection input.

Open Photo Eye (Pause): When the controller is configured for photo
eyes, the input functions to pause the gate during the opening cycle.
Once the input is cleared the gate continues to open.

Open Edge: When the controller is configured for safety edges, the
input functions to reverse the gate to the close limit when the edge is
activated during the opening cycle.

DUAL GATE COMMUNICATIONS

The controller is capable of running the operator in a master or second
mode depending on (S4) switch setting.

Before initiating any command the master unit queries for the presence
of a “second unit” for a time period of one second. If the master gets no
response the operator will operate in a stand alone mode.

NOTE: For single unit applications, a jumper must be placed between
11 and 12. In this mode no further communications will take place
during travel. If the master detects the presence of a second unit the

master will continue to query the second unit during travel. The second
unit will send a response to the master for every query.The second
operator will stop if there is a period of one second or more of no
communications.

When two operators are connected in dual gate configuration
accessories may be connected to either the master or second.

EDGE/PHOTO CLOSE

This switch (S2-4) selects edge or photo sensor for the gate closing
protection input.

Close Photo Eye (Reverse): When the controller is configured for
photo eyes, the input functions to reverse the gate to the open limit
when activated during the close cycle.

NOTE: Timer to close will reset if enabled.

Close Edge: When the controller is configured for safety edges, the
input functions to reverse the gate to the open limit when activated
during the close cycle. The entrapment is not cleared at the limit and
the timer to close will be disabled. The timer to close may be enabled
by activating the interrupt loop, soft open or hard open input.

NOTE: Do not run Master/Second communication wiring in the
same conduit as the power and control wiring.

NOTE: The Second unit will require a normally close stop circuit for
proper system operation.

NOTE: After Master/Second wiring has been completed and the S4
switch programmed, both units must have their power cycled to
initiate proper Master/Second communication.

NOTE: The motor learn function must be completed in stand alone
mode prior to Master/Second wiring.

PROGRAMMING SETTINGS (DIP SWITCH #2) continued

PROGRAMMING SETTINGS (DIP SWITCH #4)

EDGE OPEN PHOTO OPEN

S2

ON

WARN

OPED PH

MAG

ON

1 2 3 4

CLED PH

S2

ON

WARN

OPED PH

MAG

ON

1 2 3 4

CLED PH

EDGE CLOSE PHOTO CLOSE

S2

ON

WARN

OPED PH

MAG

ON

1 2 3 4

CLED PH

S2

ON

WARN

OPED PH

MAG

ON

1 2 3 4

CLED PH

Field Wiring
Terminal

12 11

STREET

MASTER OR STAND ALONE

GATE SETTING

MASTER

UNIT

ON

S4

SECOND

UNIT

Shielded cable (twisted pair)
minimum 18 gauge

Conduit

Interrupt Loop

Shadow Loop

Second

SECOND GATE

SETTING

MASTER

ON

S4

SECOND

Interrupt Loop

UNIT

UNIT

Field Wiring
Terminal

11 12

Master

(Gate Conduit)
See Figure 1

COMPLEX

OR

PARKING LOT

25

y

If both

The relays chatter
when the operator
begins to move.

Low secondary (low voltage)
power.

Measure the voltage at terminals R1 & R2 in the operator. This voltage
should be within 5% of 24Vac. If the high voltage power is good and the low
voltage power is bad, check to make sure the circuit breaker is not tripped
and that the correct primary tap is used on the transformer. If breaker and
tap are correct replace the transformer.

Perform a visual inspection of the motor. Examine the motor's labels for any
distortion or signs of over heating. Replace the motor if it is humming,
grinding or making excessive noise. NOTE: Repeated motor problems

indicate poor primary power.

The operator runs
slow and/or trips
the internal
overload.

Low primary (high voltage)
power.

TROUBLESHOOTING

Symptom

Operator fails to
run.

Possible Causes Solution

No Stop Control. Check the green LED (D17) on GL board. If the green LED is off, check to

make sure a stop control has been installed across terminals J1-3 & J1-5 of
the GL board.

Fault in the operator. Check
the yellow diagnostic LED at
the top right of the GL board
next to the programming dip
switches.

An accessory is active or
malfunctioning. Check the red
input status LEDs, D11-D31.

Improper J4 Connector Wiring
(Master/Second)

Low or no high voltage power. Measure the incoming voltage at the unit's on/off switch. It should be within

Low or no low voltage power. Measure the voltage at terminals R1 & R2 in the operator. This voltage

If the yellow LED blinks six times there is a master/second unit
communication failure. If operator is a single unit make sure there is a
jumper across terminals 11 and 12. If operator is in a dual gate
configuration make sure that the communication wiring between the two
units is undamaged and complete.

If the yellow light is solid the board needs to learn the motor. Follow the
directions on page 22.

If any red LEDs are on, check the corresponding input. An installed
accessory may be wired incorrectly or malfunctioning. Remove the
accessor

Stand-alone Operators: make sure there is a jumper installed across the J4
connector.
Master/Second Operation: Make sure that the master/second wiring is
installed correctly and is intact (not damaged).

5% of the operator's rating when running. Make sure that the proper wire
gauge was used for the distance between breaker and operator by
consulting the wiring specifications section on page 14 of this manual.

should be within 5% of 24Vac. If the high voltage power is good and the low
voltage power is bad, check transformer wiring and replace transformer.

and test the operator.

No LEDs illuminated on GL
board.

Motor runs but
gate doesn't move.

Problem in the motor.

Damaged or imptoperly
tensioned belt/drive chain.

primary and secondary power is good, check to make sure that the J2
connector is making good contact with the pins on the GL board. If all is
good replace GL board.

Measure the incoming line voltage at the unit's on/off switch as well as the
meter base or sub panel. Make sure there is not a major change in voltage.
The voltage at the operator should be within 5% of the operator's rating
when running.

Check the number of amps currently being drawn from the panel, make sure
that the total power being drawn does not exceed the panel's rating.

Make sure that the proper wire gauge was used for the distance between
breaker and operator by consulting the wiring specifications section on page
14 of this manual.

Make sure that the operator's belt/drive chain is intact and tensioned
correctly.

26

The master or second unit is
not programmed correctly.

Review program settings pages 23-24 and check both the master and
second for proper programming.

Both LEDs will indicate the activation of entrapment protection devices on
terminals J1-9 & J1-10 on the GL board. Remove the devices and retest. If
the operator now runs without fault, check those accessories as well as their
wiring.

Programming
changes do not
effect the gate.

If the switch S1-1 is in the on position any subsequent programming
changes will not affect the gate. To make programming changes, switch
S1-1 off, make desired changes, and then switch S1-1 on.

Master or Second
operator is not
functioning
properly.

TROUBLESHOOTING continued

Symptom

Operator runs but
then stops and
reverses direction.

Possible Causes Solution

Failure to cycle power after
setup.

The communication wiring may
be damaged or improperly
wired for dual gate operation.

Entrapment (Force Pot)
incorrectly set.

Gate is binding or not running
smoothly.

Observe red LEDs D29 and
D31.

The Hall Effect Sensor is not
aligned/adjusted correctly.

The power to each unit must be cycled in order to initiate proper
master/second communication if the operators were previously in stand­alone mode.
Make sure that the communication wire that is used is twisted pair and not
run in the same conduit with any power wiring. Failure to do so will result
in interference across the master/second communication line.

This pot must be set so that the gate will run smoothly normally and reverse
when encountering and obstruction. See page 22.

Disconnect the gate from the operator and swing the gate open and close by
hand at normal operating speed. Make sure that the gate swings smoothly
and does not bind. If the gate is hard to move or binds repair the gate.

Make sure that the sensor is adjusted so that it is within 20 thousandths of

an inch or as close to the magnets located on the gearbox pulley as possible
without coming into contact with them or the pulley.

Replace the sensor if it is adjusted correctly but continues to fail.

The operator
opens immediately
upon power up
and does not
close.

Open photo eye
reverses gate
closed when
activated during

opening.

Gate does not
activate the timer
to close after the
close photo eye is

broken.

Radio controls
will close gate
from the open
limit

Check the red input status
LEDs, D11-D31, for indication
of an active or malfunctioning
accessory.

Check the save switch on
switch S1-1.

Open obstruction input is
programmed incorrectly.

Close obstruction input is
programmed incorrectly.

Radio terminals R1-4 are
factory configured for
residential (Open & Close)
radio function.

If any red LEDs are on, check the corresponding input. An installed
accessory may be wired incorrectly or malfunctioning. Remove the
accessory and test the operator.

The open obstruction input has been programmed to function with gate
edges not photo eyes. Refer to page 24 and reprogram the obstruction
inputs for correct operation.

The close obstruction input has been programmed to function with gate
edges not photo eyes. Refer to page 24 and reprogram the obstruction
inputs to match the accessories that are installed on the operator.

Configure terminals R1-4 for residential radio function by performing
the following modifications:

1. Locate and disconnect the end of the wire running to terminal J1-1
from R4.

2. Connect the end of wire removed from J1-1 to J1-6. Refer to page 36.

27

NOTE: Normally the Hall Effect sensor does not need adjustment, but
may go out of alignment due to shipping vibration or rough handling.

These operators use an internal entrapment protector system. This
system consists of the GL control board, magnet, and Hall Effect
sensor. It may become necessary to adjust the sensor for correct
alignment. To do so please perform the following steps:

1. Loosen the two screws holding the hall bracket to the frame.

2. Adjust the hall effect bracket so that the hall effect board is:
a. Parallel with the pulley.
b. .020" away from the pulley's magnet. Use a feeler gauge to

measure the distance.

To avoid SERIOUS PERSONAL INJURY or DEATH
DISCONNECT electric power BEFORE adjusting hall effect.

WARNING

3. Tighten screws to secure assembly.

4. Manually rotate pulley to ensure that each magnet clears the hall
effect board.

If a magnet does not clear the board, re-adjust the hall effect assembly
accordingly.

HALL EFFECT SENSOR ADJUSTMENT

WARNING

Hall Effect
Cable

Operator
Chassis

Mounting
Screws (2)

Hall Effect
Bracket

Pulley
Magnet

Pulley

28

NOTES:

1. Severe or high cycle usage will require more frequent maintenance checks.

2. Inspection and service should always be performed anytime a malfunction is observed or suspected.

3. When servicing, please do some “house cleaning” of the operator and the area around the operator. Pick up any debris in the area. Clean the
operator as needed.

4. It is suggested that while at the site voltage readings be taken at the operator. Using a Digital Voltmeter, verify that the incoming voltage to the
operator is within ten percent of the operators rating.



Check for proper operation

External entrapment
protection systems



Check for proper operation

Gate caution signs



Make sure they are present

Manual disconnect



Check and operate

Drive chain



Check for excessive slack & lubricate

Sprockets & Pulleys



Check for excessive slack & lubricate

Gate



Inspect for wear or damage

Accessories



Check all for proper operation

Electrical



Inspect all wire connections

Frame bolts



Check for tightness

Total unit



Inspect for wear or damage

6 MONTHS3 MONTHS 12 MONTHS

TASK

CHECK AT LEAST ONCE EVERY

Complete Check Out

All power must be disconnected from operator before maintenance can be performed.

All maintenance must be done by a LiftMaster dealer.

DESCRIPTION

OPERATOR MAINTENANCE

Internal speed sensor

29

Refer to the parts lists below for replacement parts available for your operator. If optional modifications and/or accessories are included with your
operator, certain components may be added or removed from these lists. Individual components of each kit may not be available. Please consult a
parts and service representative regarding availability of individual components. Refer to page 35 for all repair part ordering information.

INDIVIDUAL PARTS

ITEM PART # DESCRIPTION QTY

1
2
3
4
5
6
7
8

9
10
11
12

HOUSING ASSY
FRONT COVER
HINGE BRACKET
SWITCH BOX COVER
DPST ON/OFF TAG
CONDUIT BOX
PAD MOUNT KIT
PEDESTAL MT. KIT
ALARM ASSY
U-BOLT NUT
8-35 X 5/8" SELF TAP SCREW
REPLACEMENT GL BOARD

1
1
2
1
1
1
1
1
1
2
2
1

ELECTRICAL PANEL ASSEMBLY KIT

E1
E2
E3
E4
E5
E6
E7
E8
E9

E10

E11
E12
E13
E14
E15
E16

HINGE BRACKET
ELECTRICAL BOX
ELECTRICAL BOX COVER
115V TRANSFORMER
24Vac RELAY
14" TYE WRAP
RESISTOR W/MTG. BRACKET
CAPACITOR
ALUMINUM STANDOFF
NYLON STANDOFF
TERMINAL STRIP INSULATOR
TERMINAL STRIP
TERMINAL STRIP
GL PCB ASSY
TINNERMAN NUT
6" PLASTIC CARD GUIDE

2
1
1
1
3
2
1
1
1
2
2
1
1
1
5
1

ARM ASSEMBLY KIT (K75-18362)

A1
A2
A3
A4
A5
A6
A7
A8

A9
A10
A11
A12

ARM
ARM EXT.
ARM STOP
ARM HUB
GATE BRACKET
1"ID KEYED 1-1/4 1/8" FG
FLANGED BUSHING
CLEVIS PIN
LATCH PIN
3/8-16 X 1" H.H. BOLT
3/8-16 X 1-1/4 H.H.
HAIR SPRING COTTER

1
1
1
1
1
1
3
1
1
1
2
1

DRIVE ASSEMBLY KIT (K75-18363)

D1
D2
D3
D4
D5
D6
D7
D8

D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23

REDUCER BRACKET
BEARING BRACKET
MOTOR PLATE
SWITCH PLATE
STIFFENER PLATE
DRIVE SHAFT
1'ID KEYED 1-1/4 1/8"
FLANGED BEARING
40B11 SPROCKET
40B32 SPROCKET
MOTOR PULLEY
#40 CHAIN 47 PITCH
MOTOR, 1/3HP 115Vac 1000 RPM
LIMIT SWITCH N.C. SPST
30:1 REDUCER
LIMIT COLLAR
HALL EFFECT ASSY
SPACER
WASHER
10-32 X 2-1/2 PHILLIP SCREW
ROLL PIN
BELT
MOLDED PULLEY

1
1
1
1
1
1
3
1
1
1
1
1
1
2
1
1
1
2
7
1
2
1
1

Complete Electrical Panel Replacement Kits

To order a complete electrical box replacement kit, add a K- prefix to
the model number of your operator. For example:

SW420-33-11 (Operator) = K73SW420-33-11 (Electrical Box Kit)

Motor Kits

To order a motor replacement kit, add a K prefix to the number of
your motor and remove the second dash (-). For example:

20-5752-33 (Motor Number) = K20-575233 (Motor Kit)

ITEM DESCRIPTION QTY

ITEM DESCRIPTION QTY

ITEM DESCRIPTION QTY

74-18465
10-18462

10-2709

10-G0326

23-3001

28-G0518
65-RSW-D
65-RSW-P

76-G0564

80-2754

82-PX08-10T

K001A5566

REPAIR PARTS

30

ILLUSTRATED PARTS

A11

A4

A5

A8

A6

1

A9

A12

A7

A10

A7

A11

A7

A3

A2

9

11

D12

D10

D13

D18

D19

D16

D6

D2

D4

D17

D14

D14

D20

D8

D9

D15

D5

D21

D1

D23

10

A1

12

D22

E6

E15

E3

E8

E15

E7

E5

E5

E14

E16

E10

E9

E4

E1

E2

D3

D11

D7

6

5

4

7

8

3

E13

2

E12

E11

31

DRAWING NUMBER:

G1977

REV:

C

NOTES:

1) TRANSFORMER PRIMARY VOLTAGE SAME AS OPERATOR LINE VOLTAGE

24V SECONDARY 15VA.

2) TERMINAL DESIGNATIONS SHOWN FOR 115V ONLY.

3) OPTIONAL WIRE HARNESS.

4) (B+) AND (B-) ARE 100db SAFETY ALARMS.

5) CONNECTED INTERNALLY ON GL PC BOARD

R2R2

J1-6J1-6

OPTIONOPTION

3R3R3

R1R1

1 2

J4J4

DUAL GATEDUAL GATE

24 VAC24 VAC

R1R1 R2R2 R3R3 R4R4 3 5 5 8 9 1010 1111 1212

RADIORADIO

SIGNALSIGNAL

STOPSTOP

INTERRUPTINTERRUPT

LOOPLOOP

ENTRAPMENTENTRAPMENT

OPENOPEN

ENTRAPMENTENTRAPMENT

CLOSECLOSE

TOTO

PRIMARY/SECONDARYPRIMARY/SECONDARY

UNITUNIT

SEE NOTE 1SEE NOTE 1

PRIM ARYPRIM ARY

24VA C24VA C

SECSEC

SEE NOTE 5SEE NOTE 5

(OR)(OR)

FIELD WIRINGFIELD WIRING

GL CONTROL BOARDGL CONTROL BOARD

24VAC-IN24VAC-IN

24VAC-COMMON24VAC-COMMON

SOFT OPENSOFT OPEN

"B" LIMIT"B" LIMIT

CONTACTOR BCONTACTOR B

RADIO COMMANDRADIO COMMAND

SHADOWSHADOW

+24 VDC+24 VDC

CLOSECLOSE

STOPSTOP

SOFT OPENSOFT OPEN

HARD OPENHARD OPEN

INT. LOOPINT. LOOP

OBS. OPENOBS. OPEN

OBS. CLOSEOBS. CLOSE

24 VAC-COMMON24 VAC-COMMON

DC-GNDDC-GND

LOCK 1LOCK 1

LOCK 1LOCK 1

ALARM 1ALARM 1

ALARM 1ALARM 1

"A" LIMIT"A" LIMIT

CONTACTOR ACONTACTOR A

RPM-INRPM-IN

RPM-SUPPLYRPM-SUPPLY

RPM GNDRPM GND

NCNC

R4R4

SEE NOTE 4SEE NOTE 4

(W)(W)

(RD)(RD)

RPM

SENSOR

J1-11

OPTIONAL WIRE
HARNESS
P/N 90-G0601

APPLICATIONS:

CONTROL WIRING TYPE - GL

FIELD WIRING & ADJUSTMENTS

MODEL TYPES: SW420

HORSEPOWER: 1/3

VOLTAGE/PHASE:

115V & 230V - 1 PHASE ONLY

845 Larch Avenue, Elmhurst, IL 60125

SINGLE PHASE WIRING DIAGRAM

32

NOTES

33

NOTES

34

NOTES

35

Seller warrants that the goods are free from defect in materials and/or workmanship for a period of two years from the date of shipment from the
F.O.B. point. Goods returned to Seller for warranty repair within the warranty period, which upon receipt by Seller are confirmed to be defective and
covered by this limited warranty, will be repaired or replaced (at Seller’s sole option) at no cost and returned pre-paid. Defective parts will be
repaired or replaced with new or factory-rebuilt parts at Seller’s sole option. Authorization instructions for the return of any goods must be obtained
by Buyer from Seller before returning the goods. The goods must be returned with complete identification, freight prepaid, and in accordance with
Seller’s instructions or they will not be accepted. In no event will Seller be responsible for goods returned without proper authorization or
identification.

THIS LIMITED WARRANTY IS IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, OR OTHERWISE, AND OF ANY OTHER OBLIGATIONS OR LIABILITY ON
SELLER’S PART. THIS LIMITED WARRANTY DOES NOT COVER NON-DEFECT DAMAGE, DAMAGE CAUSED BY IMPROPER INSTALLATION,
OPERATION OR CARE (INCLUDING, BUT NOT LIMITED TO ABUSE, MISUSE, FAILURE TO PROVIDE REASONABLE AND NECESSARY
MAINTENANCE, OR ANY ALTERATIONS TO THIS PRODUCT), LABOR CHARGES FOR DISMANTLING OR REINSTALLING A REPAIRED OR
REPLACED UNIT, OR REPLACEMENT BATTERIES. UNDER NO CIRCUMSTANCES SHALL SELLER BE LIABLE FOR CONSEQUENTIAL,
INCIDENTAL OR SPECIAL DAMAGES ARISING IN CONNECTION WITH THE SUE, OR INABILITY TO USE, THIS PRODUCT. IN NO EVENT
SHALL SELLER’S LIABILITY FOR BREACH OF WARRANTY, BREACH OF CONTRACT, NEGLIGENCE OR STRICT LIABILITY EXCEED THE
COST OF THE PRODUCT COVERED HEREBY. NO PERSON IS AUTHORIZED TO ASSUME FOR US ANY OTHER LIABILITY IN CONNECTION
WITH THE SALE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of consequential, incidental or special damages, so the
above limitation or exclusion may not apply to you. This limited warranty gives you specific legal rights, and you may also have other rights which
vary from state to state.

HOW TO ORDER REPAIR PARTS

OUR LARGE SERVICE ORGANIZATION

SPANS AMERICA

INSTALLATION AND SERVICE INFORMATION

ARE AVAILABLE 6 DAYS A WEEK
CALL OUR TOLL FREE NUMBER: 1-800-528-2806
HOURS 6:00 a.m. TO 7:00 p.m. (Central Std. Time)

MONDAY Through FRIDAY

HOURS 8:00 a.m. TO 6:00 p.m. (Central Std. Time)

SATURDAY

WWW.LIFTMASTER.COM

WHEN ORDERING REPAIR PARTS

PLEASE SUPPLY THE FOLLOWING INFORMATION:

PART NUMBER DESCRIPTION MODEL NUMBER

ADDRESS ORDER TO:

THE CHAMBERLAIN GROUP, INC.

Electronic Parts & Service Dept.

6020 S. Country Club Road

Tucson, AZ 85706

WARRANTY POLICY

©

2004, The Chamberlain Group, Inc.

All Rights Reserved

01-18451D

3

6

9

#

2

5

8

0

1

7

VISIT US AT WWW.LIFTMASTER.COM

CONTROL CONNECTION DIAGRAMS

J1 TERMINAL BLOCK

12345678 9 1011 1213141516

GL Board

NOTE: SEE WIRING DIAGRAMS SHIPPED
WITH KIT FOR ADDITIONAL INFORMATION.

SEE OWNERS MANUAL FOR WIRING
DISTANCES AND WIRE GAUGE
INFORMATION.

Field Wiring Terminal Blocks

R1 R2 R3 R4 3 5

24 VAC

SOFT OPEN

INPUT (N.O.)

HARD OPEN

CONTROL INPUT (N.O.)

O

P
E

N

C
LO

S

E

S
T

O
P

5 8 9101112

STOP/RESET

CONTROL INPUT (N.C.)

O

P
E

N

C

L

O
S

E

S

T

O
P

INTERRUPT (SAFETY)

LOOP INPUT (N.O.)

OBSTRUCTION OPEN

EDGE/PHOTO EYE INPUT (N.O.)

SW420

Operator

FRE

Q

WARNING: All controls that are to be used

to operate the gate system, MUST be
installed where the user cannot come into
contact with the gate while operating the
controls. Also, always install the controls
where the user has full view of gate
operation.

* All inputs are normally open and
momentary, except the stop (N.C.). The
following instructions are based upon
UL325, and include recommendations for
significant increase in safety.

* We strongly recommend that you follow
the UL guidelines presented throughout the
manual. Installation device instructions ­always follow the instructions provided by
the manufacturer when installing and
adjusting any control device. If these
instructions are contrary to the advice given
here, call for assistance.

HARD CLOSE

CONTROL INPUT (N.O.)

O

P

E

N

C

L
O

S
E

S

T
O

P

SHADOW LOOP

INPUT (N.O.)

FRE

Q

RESIDENTIAL RADIO

(SINGLE BUTTON) INPUT (N.O.)

OBSTRUCTION CLOSE

EDGE/PHOTO EYE INPUT (N.O.)