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Chamberlain LiftMaster Professional BG770, Installation And Maintenance Manual

The Chamberlain LiftMaster Professional BG770 is a highly efficient and reliable garage door opener. To set it up effortlessly, simply visit our website and easily access the Installation Instructions manual for free download. Make your installation process seamless with our user-friendly manual, exclusively available at manualshive.com.

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BG790 Drawing and Parts List

31

Doc 01-G0674

Rev D

BG790 Parts List

STANDARD PARTS

PART NO.

QTY.

DESCRIPTION

PART NO.

QT

Y.

DESCRIPTION

02-102 (N)

1

OPEN/CLOSE KEY SWITCH

80-1904N (N)

8

FAILSAFE BOARD STAND OFF

03-8024-K

1

3 POLE CONTACTOR

80-207-36

1

1/4 X 1/4 x 1-1/4 DISCONNECT KEY

03-ABDIN-4 (N)

1

DIN RAIL

80-5001 (N)

1

3/16 x 3/16 x 1-3/4 KEY

07-8007

2

ARM HUB

80-575 (N)

4

3/4 FLATWASHER

07-8058

1

CRANK LINK

80-8001

1

ACCESS PANEL LOCK

07-8063

1

UPPER CRANK

80-G0135 (N)

2

3/8-16 x 18 THREADED ROD

07-8064

1

LOWER CRANK

80-G0185 (N)

1

1/2 x 1/2 X 2-1/2 KEY

10-8014

1

SWITCH BRACKET

80-G0187 (N)

3

1/2 x 1/2 x 1-3/8 KEY

10-8016-T

1

TAN TOP COVER

80-G0188 (N)

1

1/2 x 1/2 x 2 KEY

10-8017-T

1

TAN ACCESS COVER

80-G0211 (N)

4

5/16 X 1-1/4 STUD

10-8021

1

ELECTRICAL PANEL

81-8000 (N)

8

SHOCK MOUNT

10-8026

1

BEARING PLATE

82-CB31-26 (N)

4

5/16-18 x 2-1/2 CARRIAGE BOLT

10-8027 (N)

1

ELECTRICAL PANEL HANGER KIT

82-HN25-08 (N)

2

1/4-20 x 1/2 SCREW

10-8051-T

1

TAN HOUSING

82-HN25-18 (N)

4

1/4-20 x 1-1/4 SCREW

10-8055

2

COUNTERWEIGHT CLAMP

82-HN31-16 (N)

4

5/16-18 X 1 HEX HEAD BOLT

N/A

N/A

N/A

82-HN50-20 (N)

4

1/2-13 x 1-1/2 HEX HEAD BOLT

11-8061

1

MAIN SHAFT

82-HN50-25 (N)

12

1/2-13 X 2-1/4 HEX HEAD BOLT

11-8062 (N)

1

INTERMEDIATE SHAFT

82-HN50-28 (N)

2

1/2-13 X 3 HEX HEAD BOLT

12-8032

5

4 BOLT FLANGED BEARING

82-HN52-18

18

1/2-20 X 1-1/4 HEX HEAD BOLT

12-8033

1

FEMALE ROD END

82-HN52-20

6

1/2-20 X 1-1/2 HEX HEAD BOLT

12-8034

1

FEMALE ROD END

82-HN75-26

2

3/4-10 X 2-1/2 HEX HEAD BOLT

13-8000 (N)

14

METAL GASKET

82-NH31-06CP (N)

1

5/16-18 X 3/8 SET SCREW

13-8001 (N)

2

RUBBER GROMMET

82-NH38-06CP

8

3/8-16 X 3/8 CONE POINT SET SCREW

15-5032

1

50B32 SPROCKET

82-PX06-06T (N)

6

6-32 x 3/8 SELF TAPPING SCREW

15-9020

1

50B12 SPROCKET

82-PX06-28 (N)

2

6-32 X 3 SCREW

16-8002

1

COGGED BELT

82-PX08-04T (N)

6

8-32 x 1/4 SELF TAPPING SCREW

17-2001

1

8" PULLEY

82-PX08-10T (N)

4

8-32 x 5/8 SELF TAPPING SCREW

17-2002

1

2" PULLEY

82-RS10-20 (N)

2

10-32 x 1-1/2 SCREW

19-5051 (N)

1

#50 CHAIN

82-SH10-18 (N)

2

10-32 X 1-1/4 SCREW

19-9024 (N)

1

#50 CHAIN MASTER LINK

84-JH-76

1

3/4-16 JAM NUT

19-9025 (N)

1

#50 CHAIN HALF LINK

84-JH-76L (N)

1

3/4-16 LEFT HAND JAM NUT

21-3260-1

1

TRANSFORMER

84-RH-50 (N)

18

1/2-13 HEX NUT

23-2017

3

SPDT LIMIT SWITCH

84-RH-75

2

3/4-10 HEX NUT

23-2761

1

ROCKER SWITCH

84-WH-10 (N)

10

10-32 SERRATED WASHER NUT

23-8001

1

TOGGLE/OUTLET COMBINATION

84-WH-25 (N)

14

1/4-20 SERRATED FLANGE NUT

24-24-1

1

24VAC DPDT RELAY

84-WH-31 (N)

12

5/16-18 SERR. FLANGE LOCK NUT

24-24-6

1

3PDT 24V RELAY

84-WH-38 (N)

8

3/8-16 SERRATED FLANGE NUT

28-3000

1

SWITCH BOX

84-WN-25 (N)

2

1/4-20 WING NUT

28-8003

1

DUPLEX OUTLET COVER

85-FW-31 (N)

8

5/16 FLATWASHER

31-10-17 (N)

2

1-32 x 1-1/8 SPACER

85-FW-38 (N)

12

3/8 FLATWASHER

31-2712 (N)

6

NYLON SENSOR SPACER

85-FW-50

24

1/2 FLATWASHER

32-8002

1

GEAR REDUCER

85-LS-31 (N)

4

5/16 SPLIT LOCK WASHER

42-110-2

1

10 POSITION TERMINAL BLOCK

85-LS-50

38

1/2 SPLIT LOCK WASHER

42-3608

1

8 POSITION TERMINAL BLOCK

85-LS-75 (N)

2

3/4 SPLIT LOCK WASHER

65-1208

1

WISHBONE ARM

91-G0122

4

LIMIT COLLAR

65-8056

1

COUNTERWEIGHT KIT

91-G0128 (N)

1

ELECTRICAL ENCLOSURE

74-G0133 (N)

1

CONTROL BOX

94-G0233 (N)

1

POWER CABLE

80-1003

1

6-32 TINNERMAN NUT

94-G0234 (N)

1

MOTOR CABLE

PARTS DESIGNATED (N) ARE NOT SHOWN ON DRAWING.
PARTS HAVING ONE OR MORE X IN THE PART NO. VARY FROM MODEL TO MODEL.  SEE “VARIABLE PARTS” BELOW.

VARIABLE PARTS

VARIABLE

P/N

DESCRIPTION

USED ON

20-1050B-2

MOTOR: BM 115/230V 1/2HP

BG790-50-11, BG790-50-21, BG790-50-81

20-3050B-4E

MOTOR: 1/2 HP - 208/230/460VAC - 3Ø - 60hz

BG790-50-23, BG790-50-43, BG790-50-83

20-XXXX

20-3050M-5

MOTOR: 1/2 HP - 575VAC - 3Ø - 60hz

BG790-50-53

24-115-1

115VAC RELAY

ALL 115VAC - 1Ø MODELS

24-XXXX

24-230-5

208/230VAC RELAY

ALL 208/230VAC - 1Ø MODELS

25-2006

6A FUSE

BG790-50-21

25-XXXX

25-2010

10A FUSE

BG790-50-11

Table 7

Summary of Contents for LiftMaster Professional BG770

Page 1: ...Doc 01 G0674 Rev D Installation and Maintenance Manual Barrier Gate Operator Models BG770 BG790 ...

Page 2: ...__________________________ 13 Step 4 Arm Attachment _____________________________________________________________ 14 Step 5 Arm and Turnbuckle Shaft Adjustments __________________________________________ 16 Step 6 Limit Switch Adjustments _____________________________________________________ 18 Optional Accessories_______________________________________________________ 19 Vehicle Detectors _______...

Page 3: ..._____________________28 BG770 Exploded View _______________________________________________________________ 28 BG770 Parts List____________________________________________________________________ 29 BG790 Drawing and Parts List_______________________________________________30 BG790 Exploded View _______________________________________________________________ 30 BG790 Parts List____________________...

Page 4: ...ty 1725 RPM Horsepower is designated by second suffix of operator part number 50 1 2 Horsepower OVERLOAD PROTECTION Automatic reset 3 phase operators or manual reset 1 phase operators thermal overload ELECTRICAL BOX NEMA 1 general purpose painted steel enclosure contains all motor control equipment Enclosure removable from operator CONTROL CIRCUIT Class II 24VAC LIMIT SWITCHES Adjustable driven li...

Page 5: ...activated or unless CLOSE button wiring has been made in which case gate will remain open until CLOSE button is pushed An optional timer will extend the time that the gate remains open AUTO MANUAL switch holds arm in vertical position SPEED REDUCTION Wormgear in oil bath 60 1 ARM TYPE MODEL BG770 One piece type to 12 feet MODEL BG790 Counterweighted wishbone type to 24 feet ARM SPEED MODEL BG770 O...

Page 6: ... wiring must be in compliance with local building and electrical codes r It is strongly recommended that you use safety equipment with this barrier gate operator There are many types of safety devices available sensing edges photo electric controls motion detectors and vehicle detectors are some of the more common types Audible and or visible warning devices are recommended when automatic controls...

Page 7: ... ensure that it is functioning properly With a safety edge installed the gate must reverse on contact with a rigid object If non contact sensors are connected to the Hold Open input and an object activates them the operator will stop a closing gate After adjusting the force or the limit of travel retest the gate operator Failure to adjust and retest the gate operator properly can increase the risk...

Page 8: ...07M GATE BRACKET 1 80 G0187 1 2 x 1 2 x 1 3 8L KEY 1 82 NH38 06 3 8 16 x 3 8 CONE POINT SET SCREW 2 82 HN50 25 1 2 13 x 2 1 4 HEX BOLT 4 82 RH 50 1 2 13 HEX NUT 4 85 LS 50 1 2 SPLIT LOCK WASHER 4 01 G0674 BG770 BG790 MANUALS 1 Table 1 MODEL BG790 PACKING LIST PART NUMBER DESCRIPTION QUANTITY 02 102 OPEN CLOSE PUSH BUTTON 1 07 8007 ARM HUB 2 10 8055 COUNTER WEIGHT CLAMP 2 80 G0135 3 8 16 x 18 THREA...

Page 9: ...NOTE Be sure that the available power is the proper voltage phase frequency and amperage to supply the gate Refer to gate nameplate located inside the service cover 3 Select locations for control equipment and run any control wiring that may be needed such as loop wires card readers ticket spitters pushbuttons etc WIRE SIZING CHART SINGLE PHASE THREE PHASE 115VAC 230VAC 230 VAC 460 VAC 575VAC AWG ...

Page 10: ...the side access panel and check the position of the power ON OFF switch 4 Open the cover of the electrical cabinet and be sure that the AUTO MANUAL switch is in the AUTO position 5 OPTIONAL CONTROL EQUIPMENT If loop detectors radio controls or other control equipment will be added at the site do so now Refer to the instructions in this manual for installation of factory supplied optional open and ...

Page 11: ...quired area for pad and conduit Pad depth should be below the frost line or as required by local codes 3 Locate four 1 2 X 6 long L bolts not supplied as shown in Figure 4 The L bolts should protrude 1 1 2 inches above the pad 4 Pour concrete insuring that the pad is level and above the ground line 5 Allow the concrete to set at least two days before installing gate Figure 4 Concrete Pad Layout ...

Page 12: ...ade paint and stripe with paint or adhesive backed tape as required 01 G0674F7 Length as Needed up to 12 feet 5 12 Material 6 x 1 Pine or Redwood 3 Figure 5 MODEL BG790 WISHBONE ARM A twenty four foot wishbone arm is supplied as standard with every BG790 gate If a shorter arm is desired the extension may be shortened See Figure 6 The maximum arm extension is 8 feet for a total arm length of 24 fee...

Page 13: ...pment with every BG770 and BG790 barrier gate If you are not using automatic controls to control the gate the two button station may be connected as shown on the wiring diagram supplied with the gate to control the gate manually However the AUTO MANUAL switch should be kept in the AUTO position IMPORTANT NOTE Use 16 gauge wire or larger for all control wiring connections If the control wire is too...

Page 14: ...ive shaft will move during some of the steps Keep hands and tools out of the gate cabinet and away from the belt and drive shaft or serious injury may result Be sure to disconnect power while installing the arm attachment MODEL BG770 STANDARD ARM Attach arm to the arm hub flange as shown in Figure 7 01 G0674F9 Gate Arm Hub Flange Hex Bolt 1 2 13 x 2 1 4 Lock Washer 1 2 13 Hex Nut Figure 7 MODEL BG...

Page 15: ... extension arm between the two halves of the wishbone arm before bolting together See Arm Fabrication starting on page 12 for extension arm preparation 3 Assemble the two 3 8 threaded rods to the arms for center support as shown in Figure 10 4 Turn on power and test the gate Wishbone Arm Arc of Travel Ensure adequate clearance for travel of arm 01 G0674F11 Figure 9 WARNING Be prepared for gate to ...

Page 16: ...preset in this position at the factory 2 If the arm is not level loosen the jam nuts at both ends of the turnbuckle shaft Insert a screwdriver or other similar tool into the hole in the shaft Rotate the shaft either CW or CCW as necessary until the gate arm is in the desired horizontal position Retighten jam nuts Pivot Arm Pulley Crank Arm Jam Nut Turnbuckle Shaft 01 G0674F13 Figure 11 Model BG770...

Page 17: ... the factory 2 If the arm is not level loosen the jam nuts on both the top and bottom end of the turnbuckle shaft 3 Rotate the shaft either CW or CCW as necessary until the gate arm is in the desired horizontal position NOTE While the arm is raising the upper and lower cranks should travel toward the side access cover Turnbuckle Shaft Jam Nut Lower Crank Arm in closed position See Note Pulley Uppe...

Page 18: ...ghten the set screw This adjustment may have to be fine tuned after turning on power and running the unit for the first time AUXILIARY CLOSE LIMIT SWITCH The AUXILIARY CLOSE limit switch is preset at the factory If you made an adjustment to the CLOSE cam you will need to adjust the cam on the AUXILIARY CLOSE limit switch also 1 Position the AUXILIARY CLOSE cam slightly ahead of the CLOSE cam When ...

Page 19: ...g the harness into the connector marked HOLD OPEN 2 Connect the loop wires to terminals P3 and P4 as shown on the wiring diagram Radio Controls All types of standard radio controls may be used in conjunction with model BG770 and BG790 If the receiver is mounted inside of the gate enclosure a commercial coaxial antenna should be used and extended through the side of the cabinet POWER CONNECTION All...

Page 20: ...y Do not use the 24 volt power in the gate to supply other devices Use either direct line voltage 115V or 230V or other external power source as required by the particular device NOTE Most access control devices have an isolated normally open output contact to connect to the gate If yours does not or if you are unsure of or unfamiliar with these terms consult the supplier of the device or a qualif...

Page 21: ...ill trip when the motor temperature is too hot DO NOT ATTEMPT TO BYPASS THIS UNIT If the overload trips the gate could start by itself when the overload is reset either manual or automatic Exercise caution when resetting the overload On one phase units the reset button is located on the cover of the electrical cabinet If after resetting the overload continues to trip consult a qualified service co...

Page 22: ...al Volt Min Max 120v 108 132 230v 207 253 460v 414 506 Table 4 If you get a reading that does not fall into the minimum maximum area then check out your main power supply Also make sure that the operator was ordered with the proper voltage and phase Another item to check is the wire run from the power supply to the operator Double check the gauge of the wire versus the distance 1B If the voltage r...

Page 23: ...om the accessory is removed 2C In some applications the gate may begin to move then either stop or stop and reverse within a couple of seconds This can be caused by an external obstruction device that has failed 2D If there are many accessories attached to and powered by the operator there may be too much current draw for the operator s control transformer This operator can only supply approximate...

Page 24: ...press down on the contactor you should get a continuity reading Repeat this on all of the contactor s contact points 3E If the problem is thought to be the motor it is recommended that it be replaced It is possible that the thermal overload inside the motor has overheated Wait approximately 15 minutes then try running unit NOTE Some motors have the overload built into the motor itself while other ...

Page 25: ...with the operator Note that some of the accessory items may have their own wiring diagram If you cannot correct the problem or if you feel you will require technical assistance contact your local distributor or dealer If you do not have a distributor or dealer then contact us for technical assistance Please when calling for assistance make sure you have the gate operator model number voltage phase...

Page 26: ... motor oil Never use grease or silicone spray 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 if needed Severe or high cycle usage will require more frequent maintenance checks It is suggested that while you are at the site take some voltage readings of the operator Using a VOM double check the incoming...

Page 27: ...RESS 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 ALTERATIO...

Page 28: ...28 BG770 Drawing and Parts List Doc 01 G0674 Rev D BG770 Drawing and Parts List BG770 Exploded View ...

Page 29: ...0 N 2 10 32 x 1 1 2 SLOTTED SCREW 17 2001 1 8 PULLEY 82 HN38 24 N 4 3 8 16 x 2 HEX HEAD BOLT 17 2002 1 2 PULLEY 84 JH 75 N 1 3 4 10 JAM NUT 21 3260 1 1 TRANSFORMER 84 JH 76 1 3 4 16 JAM NUT 23 2017 3 SPDT LIMIT SWITCH 84 JH 76L 1 3 4 16 LEFT HAND JAM NUT 23 2761 1 ROCKER SWITCH 84 RH 50 N 4 1 2 13 HEX NUT 23 8001 1 TOGGLE OUTLET 84 RH 75 1 3 4 10 HEX NUT 24 24 1 1 24VAC DPDT RELAY 84 WH 10 N 2 10 ...

Page 30: ...30 BG790 Drawing and Parts List Doc 01 G0674 Rev D BG790 Drawing and Parts List BG790 Exploded View Figure 16 ...

Page 31: ...PX08 04T N 6 8 32 x 1 4 SELF TAPPING SCREW 17 2001 1 8 PULLEY 82 PX08 10T N 4 8 32 x 5 8 SELF TAPPING SCREW 17 2002 1 2 PULLEY 82 RS10 20 N 2 10 32 x 1 1 2 SCREW 19 5051 N 1 50 CHAIN 82 SH10 18 N 2 10 32 X 1 1 4 SCREW 19 9024 N 1 50 CHAIN MASTER LINK 84 JH 76 1 3 4 16 JAM NUT 19 9025 N 1 50 CHAIN HALF LINK 84 JH 76L N 1 3 4 16 LEFT HAND JAM NUT 21 3260 1 1 TRANSFORMER 84 RH 50 N 18 1 2 13 HEX NUT ...

Page 32: ...Master The software and firmware included in the LiftMaster product as they relate to this documentation are also protected by copyright and contain information proprietary to LiftMaster FOR TECHNICAL SUPPORT Call our toll free numbers 800 323 2276 800 998 9197 Installation and service information is available six days a week TO ORDER REPAIR PARTS Call our toll free numbers 800 528 2806 800 998 91...

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