Chamberlain Swing GATE User Manual

Doc 6001242 (01

Doc 6001242 (01----20273)

Doc 6001242 (01Doc 6001242 (01

INSTALLATION AND OPERATION INSTRUCTIONS

INSTALLATION AND OPERATION INSTRUCTIONSINSTALLATION AND OPERATION INSTRUCTIONS

20273)

20273)20273) Rev C

Rev C

Rev CRev C

MODEL

MODELMODEL

SWING GATE OPERATOR

SWING GATE OPERATORSWING GATE OPERATOR

FOR THE

FOR THEFOR THE

SW 2000

SW 2000 SW 2000

((((----68 BOARD)

68 BOARD)

68 BOARD)68 BOARD)

----

B1B1

TABLE OF CONTENTS

SAFETY SUMMARY....................................................................................................... 3

BASIC INSTALLATION HINTS AND RULES................................................................. 4

PART 1 SITE PREPARATION...................................................................................... 5

A. LOCATION AND LAYOUT ..........................................................................................................5

B. PAD AND MOUNT....................................................................................................................... 6

C. POWER WIRING ........................................................................................................................ 7

D. LOOP DETECTORS ................................................................................................................... 7

E. OTHER CONNECTIONS............................................................................................................. 7

PART 2 SYSTEM INSTALLATION.............................................................................. 8

A. MOUNTING GATE OPERATOR ................................................................................................. 8

B. CONNECTING POWER.............................................................................................................. 8

C. RUNNING INPUT WIRING .........................................................................................................9

D. SETTING GATE OPEN DIRECTION SWITCHES S2 AND S3 .................................................. 9

E. POWER UP PROCEDURE ......................................................................................................... 9

F. USING MANUAL CONTROLS................................................................................................... 10

G. GATE ARM INSTALLATION ..................................................................................................... 11

H. SETTING LIMIT CAMS ............................................................................................................. 12

I. GATE SENSITIVITY ADJUSTMENTS....................................................................................... 14

J. SETTING GATE CONTROL SWITCH S1 AND RECLOSE TIMER POT R94 .......................... 16

K. POWER FAIL OPERATION OPTION CONNECTION .............................................................. 18

L. CONNECTING INPUT WIRING................................................................................................. 19

M. POST INSTALLATION PROCEDURES ................................................................................... 20

N. FINAL ASSEMBLY OF GATE OPERATOR .............................................................................. 23

PART 3 MASTER/SLAVE OPERATION.................................................................... 24

A. WHAT IS MASTER/SLAVE OPERATION? ............................................................................... 24

B. MASTER/SLAVE GATE CONFIGURATIONS........................................................................... 24

C. MASTER/SLAVE WIRING........................................................................................................ 25

D. MASTER/SLAVE SETUP PROCEDURE .................................................................................. 26

E. MASTER/SLAVE INSTALLATION DETAILS............................................................................. 27

PART 4 MODEL SW 2000-B1 OPTIONS ................................................................... 33

A. LIFTMASTER LOOP DETECTOR BOARDS ............................................................................ 33

B. POWER FAIL OPERATION OPTION ....................................................................................... 33

C. GATE OPERATOR COVER WITH ACCESS DOOR................................................................ 33

PART 5 TROUBLESHOOTING AND MAINTENANCE ............................................. 34

A. TROUBLESHOOTING............................................................................................................... 34

B. FAULT LIST ............................................................................................................................... 38

C. FAULTS AND THEIR CAUSES................................................................................................. 39

D. MAINTENANCE......................................................................................................................... 40

APPENDIX A SYSTEM OPERATION REFERENCE................................................. 43

APPENDIX B PARALLEL GATE WIRING ................................................................ 49

APPENDIX C MODEL SW 2000-B1 PARTS LIST .................................................... 50

GLOSSARY .................................................................................................................. 51

NOTICE TO CANADIAN USERS.................................................................................. 52

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The LiftMaster Model SW 2000-B1

The LiftMaster model SW 2000-B1 Swing Gate Operator is a full featured commercial gate operator with a master/slave wiring capability. The SW 2000-B1 contains the following features:

• Dynamic motor braking limits gate overtravel.

• Separated arm segment joints reduce the risk of injury to users.

• Alternate action OPEN/CLOSE inputs.

• Manual switch inputs override other commands.

• Adjustable reclose timer.

• Gate lock relay can be used for electromagnetic locks and CCTV cameras or

lights.

• Master-slave operation for two operators on bi-part gates and vehicle trap gates.

• Selectable anti-tailgate function prevents two cars from entering on one open command.

• Senses obstructions through adjustable Peak motor current senses.

• Open Motor detection indicates when the motor is not drawing any current.

• Two separate peak motor current sense adjustments for reversing direction

or stopping; one for clockwise motion and the other for counterclockwise motion.

• Initial inrush current sense adjustment offsets initial inrush current to the motor.

• Automatic fault Re-Try causes the gate operator to retry an operation twice following a fault condition.

• Selectable Automatic Gate Closure feature closes the gate when power is restored after an outage unless gate is at open limit.

• Two 115 VAC accessory plugs provided.

• 24 VAC accessory power provided.

• 80:1 worm gear reduction.

• Output torque limiter prevents damage to the gate operator caused by force

pushing against the gate.

• Handles any gate weight up to 1000 pounds and length up to 18 feet.

• Diagnostic LEDs on controller board indicate gate operator actions and assist in

troubleshooting.

• Power Fail Operation option automatically opens or closes the gate (user's choice) if AC power fails.

• Optional loop detector add-on boards plug into the controller board for Interrupts, shadow and exit loops.

• Inside and outside Interrupt Loops enhance gate control and distinguish between entering and exiting traffic.

• Optional cover access door provides easy access to the control box.

DIMENSIONS WEIGHT ELECTRICAL

Height 24” Width 20” Depth 23”

15 Lbs. Accessory Kit

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159 Lbs. 115 VAC, Single Phase, 60 Hz., 8 amp (172 Lbs. with Power (A separate 20 AMP circuit is Fail Operation option.) required by most codes.)

SAFETY SUMMARY

It is important for everyone involved in the installation and operation of the LiftMaster model SW 2000-B1 Swing Gate Operator reads the following warnings.

WARNING!

• A vehicle gate is a large, heavy object that is moved by an electric motor. A moving gate can cause serious injury or death! The safety and well-being of others depends on the installation of a safe system.

• Improper installation of a gate operator can result in a dangerous system.

• Gate operators can present serious hazards to persons in the immediate area when

not controlled in a safe manner. Choose one or more controls which together will allow complete control of the gate. Most importantly, the gate must be able to be stopped at all times in case of emergency, and the emergency control should be conveniently located, clearly marked and visible.

• All controls must be kept out of the reach of small children. Serious injury or death can result from children playing with the controls.

• All controls should be located so the person operating them can see the full area of gate movement.

• Gate operators and associated control equipment should be installed by qualified professional installers who should observe the following safe installation procedures:

1. Power should always be disconnected whenever installing, wiring or servicing a

gate operator. Moving chains and belts in gate operators can catch clothing or fingers and cause severe injury.

2. Installation of wiring should comply with all local building and electrical codes.

3. All manual gate locks should be disabled to avoid damage to the gate or gate

operator should the lock become engaged after the operator is installed.

4. All operator controls and safety equipment should be tested at the conclusion of

installation to be sure they are functioning properly.

5. The operation of the gate controls and safety equipment should be reviewed with

the owner and/or end user of the automated gate system. They should also be informed of the need to maintain control and safety equipment on a regular basis. Safety equipment should be checked monthly to ensure it is working properly. All installation manuals and safety information should be left with the owner.

6. Moving gates have pinch points and entrapment zones which can be extremely

dangerous to pedestrians, especially small children.

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BASIC INSTALLATION HINTS AND RULES

PLEASE READ THIS SECTION CAREFULLY BEFORE BEGINNING YOUR INSTALLATION.

The sections that follow contain detailed procedures for installation of a model SW 2000-B1 system. In addition to these specific procedures, there are a number of general hints and rules which will help ensure that your installation will be done correctly and efficiently. These are discussed below.

1. UNDERSTAND THE SYSTEM AND INSTALLATION SITE THOROUGHLY. The SW 2000-B1 is a flexible and reliable gate operator system, but the quality of service depends directly on the quality of installation. Please read these instructions carefully and study the applicable diagrams before planning your installation. In particular, understand any site characteristics that may affect the system installation.

WARNING

2. INSTALL PERMANENT WIRING. U.L. specifications require the SW 2000-B1 system to be

permanently wired. Refer to your local wiring code for specific information.

WARNING: Damage caused by faulty wiring is not covered by warranty.

3. GROUND THE SYSTEM. The system contains parts which may be damaged by static discharge. A

proper earth ground connected to the gate operator housing (see Figure 3) will significantly reduce the chances of damage or improper operation. The shielding in the cables specified for all remote sensors and controls should also be connected to earth ground at the controller end of the cable only.

To be effective, the ground connection must be made by running 12 awg copper wire to a good ground

point (e.g., an electrical panel, a metallic cold water pipe that runs into the earth, or a grounding rod at least 10 feet in length that is driven into the earth) within 12 feet of the system. Even if you have a good earth ground, you should try to discharge any static before handling the circuit boards.

WARNING: Damage caused by static discharge and lightning is not covered by warranty.

4. PROVIDE POWER FROM A DEDICATED SOURCE. The outlet into which you connect the Gate

Operator should be wired to its own circuit breaker. This will reduce the line noise introduced into system power and minimize the risk of having other equipment interrupt system operation. In a Master/Slave system, Master and Slave must each have separate circuits.

5. DO NOT OVERLOAD THE TERMINAL BLOCKS. The terminal blocks used in the gate operator are removable and the pins are soldered into the boards. To connect your wires, remove the "head" from the correct terminals and open the screws. Insert the wire into the correct opening on the front and tighten the screw until the wire is held firmly. When you have made all connections for a given "head", plug it back onto the pins designated for that terminal block.

Stranded wire must be between 16 and 24 awg. Solid wire must be between 18 and 24 awg. This is

the total thickness measurement so, if you are putting two wires in, the combined thickness must fall within this range. NEVER try to insert more than two wires per terminal.

6. ENSURE GOOD CONNECTIONS. A light tug on the wire will tell you if the connection is secure. When reconnecting system components, make sure all pins are straight on chips, connectors, and terminal block heads.

7. READ THE MARKINGS CAREFULLY. The connection points are marked on the boards clearly. Before making any connection, be sure to read the marking and check it against the corresponding figure in these instructions so that you understand the connection you are making.

8. TRAIN YOUR CUSTOMERS THOROUGHLY. Although customer responsibility is limited to proper installation, the quality of service is determined by the care of system setup. Ensure that the customer has a copy of this manual to guide them. It will save you and them lots of inconvenience and aggravation later.

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A. LOCATION AND LAYOUT

PART 1

SITE PREPARATION

Figure 1. Gate Operator Layout Options.

NOTES

• Left Gate and Right Gate are determined by looking from inside the complex toward the street.

• Figure 1 shows a typical Bi-Parting gate in standard and compact installations.

1. Always install gate operators inside of the fence line, NEVER on the public side of the fence.

2. Mount all manual controls and activating devices at least 6 ft. away from the gate for safety.

3. Allow enough clearance around the gate and the gate operator for installation and service.

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B. PAD AND MOUNT

Figure 2. Pad and Mount.

1. The concrete pad must be sufficient to support the gate operator and the dynamic forces

created by the moving gate. LiftMaster recommends a pad 24” wide by 27” long by 30” deep.

2. The operator must be level and parallel to the gate, so the pad should be level and about 4”

above grade to prevent water entrance.

3. Four anchor bolts are required to secure the gate operator to the pad. The mounting holes in

the gate operator are 5/8” in diameter. Red Head bolts ½” x 3½“ are recommended.

4. Be sure to provide access for wiring conduits. In Master/Slave systems, remember to include

conduit stubs for separate inputs (if any) and for the Master/Slave connection cable between gate operators.

NOTE: Shading indicates conduit stub access areas .

INSTALLATION NOTES

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C. POWER WIRING

1. Provide a separate conduit stub for the AC power.

2. Each gate operator requires a 115 VAC 20 AMP single phase circuit. NOTE: Master and

Slave units each require separate circuits to prevent false overcurrent faults.

3. Be sure to pull a ground wire in the conduit for the connection to the gate operator. Do not rely

on metallic conduit for earth ground.

D. LOOP DETECTORS

1. The gate operator has a shelf that can support non-LiftMaster loop detector electronics.

Power for the loop detector can come from the auxiliary 115 VAC plugs in the gate operator or from the 24 VAC provided by the gate operator control board.

2. Conduit provisions should be made for the “loop” wire entrance to the loop detector.

3. The shelf space provided is approximately 4” x 10” x 5” high. Shelf space on systems without

the Power Fail Operation Option is about 10" x 10" x 5".

NOTE: Optional LiftMaster-supplied loop detector add-on boards are available, both pre-installed

and for installation in the field. See Part 4, SW 2000-B1 Options.

E. OTHER CONNECTIONS

Provisions should be made for conduit entrance into the gate operator for Master/Slave wiring and external activating devices such as key switches, telephone entry systems, etc.

INSTALLATION NOTES

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SYSTEM INSTALLATION

A. MOUNTING GATE OPERATOR

For safety reasons, the Power Fail Operation Option is shipped with the battery unconnnected to the system. Do not connect the battery until all other installation and alignment procedures have been completed. Failure to observe this warning may result in the Power Fail Operation Option moving the gate at unexpected moments.

To avoid injury, always turn off the unit power switch before working on gate.

1. Loosen the large mounting bolt and remove the Swing Arm Cap assembly.

2. Remove 4 protective bolts holding the cover on, lift off the cover and set aside.

3. Remove the assembly kit and parts.

4. Remove the 4 bolts that attach the gate operator to the shipping pallet.

5. Mount gate operator on the cement pad using the previously installed anchors. Be sure the

operator mounting is level and square, and that the gate operator control box faces away from the gate.

6. Connect the power conduit into the switch box.

7. Reinstall the Swing Arm Cap assembly and finger tighten the large mounting bolt.

PART 2

WARNING

B. CONNECTING POWER

CAUTION

Ensure that the AC power circuit breaker is turned off before wiring power to the switchbox.

Run power cables through the conduit to Gate Operator, then connect wires to the switch box as shown in Figure 3:

1. Wire nut the hot (black) wire to the black pig tail.

2. Wire nut the neutral (white) wire to the white pig tail.

3. Wire nut the ground (green) wire to the green pig tail.

4. Dress all wiring inside the switch box and install cover.

Figure 3. AC Wiring.

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C. RUNNING INPUT WIRING

1. Remove the plastic control box cover.

2. Run wires from input components and Master/Slave conduits into control box.

3. For Master/Slave wiring, refer to Part 3, Master/Slave Operation.

WARNING

Route but do not connect input wires at this time. If inputs are connected now, the gate operator may activate at random during installation, potentially injuring installation personnel.

D. SETTING GATE OPEN DIRECTION SWITCHES S2 AND S3

Figure 4. Gate Direction, Power Fail Option Switch Location.

NOTE: For swing gate operation, controls are Right/Clockwise and Left/Counterclockwise.

1. Gate opening direction is set by switch S2, located on the control board. The switch is sensed

only on power up, so it should be set when the power is off.

2. Ensuring power is off, set switch S2 to the left for a Right Gate, or to the right for a Left Gate.

If the system was ordered with the Power Fail Operation option:

3. The power failure gate opening direction is set by switch S3, located next to switch S2 on the

control board. Set switch S3 left for clockwise or right for counterclockwise opening.

E. POWER UP PROCEDURE

1. Turn on circuit breaker that provides power to gate operator.

2. On Manual Input Terminal TB2, connect the STOP terminal to the COMMON terminal (see

Figure 5).

3. Turn on gate operator power switch and verify that the row of LEDs on the right side of the

controller board all turn on, then turn off sequentially, starting from the bottom. The only LEDs that should remain on are Power ON, MAGLOCK, and CLOSE LIMIT or OPEN LIMIT, if one of the limit switches are engaged. NOTE: If the LEDs do not follow this pattern, the controller board may not be working correctly. Stop installation and call LiftMaster Technical Support for assistance.

4. On Manual Input Terminal TB2, disconnect the STOP terminal from the COMMON terminal.

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F. USING MANUAL CONTROLS

Figure 5. Manual Controls, Location and Use.

Use the manual controls on Manual Input Terminal TB2 (OPEN, CLOSE, and STOP, as shown in Figure 5), to move the gate for arm installation and making the limit cam adjustments.

• To open the gate: connect the OPEN and STOP terminals to the COMMON terminal.

• To close the gate: connect the CLOSE and STOP terminals to the COMMON terminal.

• To stop the gate: disconnect the STOP terminal from the COMMON terminal.

IMPORTANT NOTE

If the STOP terminal is disconnected from the COMMON terminal, the gate is prevented from moving and no command will affect the gate.

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G. GATE ARM INSTALLATION

Figure 6. Gate Arm Installation.

1. Attach gate anchor to gate by welding or using hardware (not supplied).

2. Using manual controls, move the swing arm cap assembly until it points roughly to the

anchor as shown in Figure 6.

3. Measure and cut the swing arm to length. Attach swing arm to swing arm cap assembly

with gate stop on driveway side, using supplied hardware or by welding. WARNING: Installing gate stop on the wrong side will cause damage to the gate operator.

4. Measure and cut Drag Link pipe to length, then insert spherical rod end assembly into pipe

and tighten locking nut.

5. Attach welded end of Drag Link Assembly to Anchor and unwelded end to Swing Arm.

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H. SETTING LIMIT CAMS

• The limit cams are adjusted by loosening the locking screws and rotating the cams. The cams

rotate with the swing arm shaft, so small adjustments are magnified by the length of the gate.

• The gate operator torque limiter allows the gate to be pushed or pulled a short distance (a few

inches) only. Use manual controls to move the gate during limit cam adjustment.

• To avoid damage to the gate and gate operator due to the gate overrunning its limits, perform

the following steps carefully:

1. SETTING RIGHT GATE LIMIT CAMS

Figure 7. Setting Right Gate Limit Cam.

1. Make sure that switch S2 is set to the "Left" position.

2. Turn on gate operator power switch.

3. Using manual CLOSE and STOP, move the gate to its proper closed limit position.

4. Loosen the locking screw on the bottom limit cam and turn the cam clockwise until it just barely

closes the limit switch.

5. Retighten the limit cam locking screw.

6. Using manual OPEN and STOP, move the gate to its proper open limit position.

7. Loosen the locking screw on the top limit cam and turn the cam counterclockwise until it just

barely closes the limit switch.

8. Retighten the limit cam locking screw.

9. Open and close the gate to check the limit cam settings. If required, readjust the limit cams

until they are set properly.

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2. SETTING LEFT GATE LIMIT CAMS

Figure 8. Setting Left Gate Limit Cam.

1. Make sure that switch S2 is set to the "Right" position.

2. Turn on gate operator power switch.

3. Using manual OPEN and STOP, move the gate to its proper open limit position.

4. Loosen the locking screw on the bottom limit cam and turn the cam clockwise until it just barely

closes the limit switch.

5. Retighten the limit cam locking screw.

6. Using manual CLOSE and STOP, move the gate to its proper closed limit position.

7. Loosen the locking screw on the top limit cam and turn the cam counterclockwise until it just

barely closes the limit switch.

8. Retighten the limit cam locking screw.

9. Open and close the gate to check the limit cam settings. If required, readjust the limit cams

until they are set properly.

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I. GATE SENSITIVITY ADJUSTMENTS

The gate operator monitors both average and peak motor current. When the gate encounters an obstruction, the gate operator senses the change in motor current and stops or reverses the gate. Three sensitivity adjustments must be set in the field:

• Right gate motion (R78)

• Left gate motion (R81)

• Inrush current (R119)

NOTES: The Overload adjustment (R71) is factory set. Do not adjust. Current flow varies with temperature. Do not tune the sensitivity measurements too

finely, or they may change with the time of day or seasons. For swing gate operation, controls are Right/Clockwise and Left/Counterclockwise.

♦ If your installation requires setting switch S2 the “Open to Right” position, use the “Open to

Right" adjustment procedures below. If your installation requires setting S2 to the “Open to Left” position, use the “Open to Left" adjustments following the "Open to Right" procedures.

♦ The minimum sensitivity is full clockwise and maximum sensitivity is full counter clockwise.

These adjustments must be made while the gate is in motion.

♦ Before starting the adjustments, verify that the Overload pot is set to 3:00 o'clock, the Left and

Right reverse pots are set fully clockwise, and the Inrush pot is set to the 11 o’clock position (see Figure 9).

♦ Make all adjustments in the order listed.

Figure 9. Gate Sensitivity Adjustments Location.

1. LEFT GATE (CLOCKWISE OPEN) ADJUSTMENTS

"Right Reverse" Adjustment (R78)

1. Initiate opening the gate.

2. Wait 4 to 5 seconds, then lightly "tug"against the edge of the gate to simulate an obstacle.

3. If the gate does not stop, reclose the gate and adjust the pot slightly counterclockwise.

4. Repeat steps 1-3 until the gate stops when tugged and has the desired sensitivity.

"Left Reverse" Adjustment (R81)

1. Open the gate fully, then initiate closing the gate.

2. Wait 4 to 5 seconds, then lightly "bump" the leading edge of the gate to simulate an obstacle.

3. If the gate does not stop or back up, reopen the gate and adjust the pot slightly counterclockwise.

4. Repeat steps 1-3 until the gate stops or backs up when bumped and has the desired sensitivity.

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2. RIGHT GATE (COUNTERCLOCKWISE OPEN) ADJUSTMENTS

"Left Reverse" Adjustment (R81)

1. Initiate opening the gate.

2. Wait 4 to 5 seconds, then lightly "tug"against the edge of the gate to simulate an obstacle.

3. If the gate does not stop, reclose the gate and adjust the pot slightly counterclockwise.

4. Repeat steps 1-3 until the gate stops when tugged and has the desired sensitivity.

"Right Reverse" Adjustment (R78)

1. Open the gate fully, then initiate closing the gate.

2. Wait 4 to 5 seconds, then lightly "bump" the leading edge of the gate to simulate an obstacle.

3. If the gate does not stop or back up, reopen the gate and adjust the pot slightly counterclockwise.

4. Repeat steps 1-3 until the gate stops or backs up when bumped and has the desired sensitivity.

3. INRUSH CURRENT ADJUSTMENT (R119)

1. Turn the pot fully counterclockwise.

2. Initiate opening the gate.

3. If the gate stops due to a fault condition, slightly adjust the pot clockwise.

4. Repeat steps 2 and 3 until the gate cycles without a fault.

5. Open the gate fully, then initiate closing the gate.

6. If the gate stops or backs up due to a fault condition, slightly adjust the pot clockwise.

7. Repeat steps 6 and 7 until the gate cycles without a fault and has the desired sensitivity.

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J. SETTING GATE CONTROL SWITCH S1 AND RECLOSE TIMER POT R94

NOTE: For complete details on controls, indicators adjustments and inputs, see Appendix A.

1. GATE CONTROL SWITCH (S1)

Figure 10. Gate Control Switch S1 Location.

SLIDE ACTION

(S1-1) Inside Interrupt Loop: four different modes are selectable:

When used with ATG, this switch controls several gate operator features:

SLIDE and ATG OFF:

Loop activation prevents the gate from opening or closing. If gate is moving, Loop activation stops the gate. When the Loop clears, the gate resumes its course.

SLIDE only ON:

Loop activation prevents the gate from closing. If gate is closing, Loop

activation opens the gate and starts the Reclose Timer, if timer is on.

ATG only ON:

Loop activation prevents the gate from opening or closing. If gate is closing, a Loop activation stops the gate. When the Loop clears, the gate resumes closing. If the gate is opening or fully open, as soon as the Loop clears, the gate immediately begins closing to discourage tailgaters.

SLIDE and ATG ON:

Loop activation prevents the gate from closing. When the Loop clears, the gate resumes closing. If gate is opening or fully open, as soon as the Loop clears, the gate immediately begins closing to discourage tailgaters. Dynamic Braking: When SLIDE is ON, gate brakes whenever it stops. When SLIDE is OFF, gate brakes only at open or close limit.

TIMER Sets the Reclose Timer to OFF (left) or ON (right). When enabled, the timer controls

(S1-2) how long the gate waits at the open limit before closing. The Reclose Timer can be

set from 0-250 seconds by adjusting the Reclose Timer pot (R94). During a power outage, if the gate is fully open and TIMER is ON, the Reclose Timer starts after the

restoration of power, causing the fully open gate to close automatically.

RETRY Sets the Retry function to OFF (left) or ON (right). When enabled, if the gate meets

(S1-3) an obstacle, a closing gate reverses and an opening gate stops, waits 30 seconds,

then tries to resume. The gate will re-try twice before it faults out.

ATG Sets Anti-Tailgate function to OFF (left) or ON (right). The Anti-Tailgate feature helps

(S1-4) prevent two cars from entering on one OPEN command.

MASTER In conjunction with the TRAP switch, sets configuration for master/slave system.

(S1-5)

TRAP In conjunction with the MASTER switch, sets configuration for master/slave system.

(S1-6)

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