LiftMaster MH Support Question
LiftMaster MH Support Question
Find answers below for this question about LiftMaster MH.Need a LiftMaster MH manual? We have 4 online manuals for this item!
Question posted by mstrombley91 on July 12th, 2023
Pneumatic Reversing Safety Edge Stops Door But Does Not Reverse The Door Back Up
help?
Current Answers
Answer #1: Posted by SonuKumar on July 12th, 2023 9:01 PM
SonuKumar
Member since:
May 9th, 2021 Points: 16,621,300
Member since:
May 9th, 2021 Points: 16,621,300
If your LiftMaster MH Pneumatic Reversing Safety Edge is stopping the door but not reversing it back up, it could indicate a problem with the safety edge itself or the door opener. Here are a few troubleshooting steps you can take:
- Check for Obstructions: Make sure there are no objects blocking the path of the door or interfering with the operation of the safety edge. Remove any obstructions that could be preventing the door from reversing.
- Inspect the Safety Edge: Examine the safety edge for any visible damage or wear. Look for signs of wear and tear, such as frayed or damaged wires. If you notice any issues, the safety edge may need to be repaired or replaced.
- Test the Safety Edge Functionality: Check if the safety edge is functioning properly by conducting a simple test. Close the door and place an obstruction, such as a piece of wood or a soft object, in the path of the door. The safety edge should detect the obstruction and cause the door to reverse back up. If it doesn't, there may be a problem with the safety edge's sensitivity or connection.
- Check Wiring and Connections: Inspect the wiring and connections between the safety edge and the door opener. Ensure that all connections are secure and free from corrosion. If any wiring issues are found, repair or replace the affected components as needed.
- Adjust Sensitivity Settings: Some door openers have sensitivity adjustment settings that control how much force is required to reverse the door. Consult the user manual for your specific model of LiftMaster opener and adjust the sensitivity settings accordingly. Be cautious not to set the sensitivity too low, as it can compromise the safety of the door.
Please respond to my effort to provide you with the best possible solution by using the "Acceptable Solution" and/or the "Helpful" buttons when the answer has proven to be helpful.
Regards,
Sonu
Your search handyman for all e-support needs!!
Related LiftMaster MH Manual Pages
MGJ User's Guide Manual - Page 2
....
Reversing devices are recommended for Monitored Safety Devices)
• Timer to Close (TTC) feature not available. AVERTISSEMENT
ATTENTION
B C2 WIRING TYPE WITH MONITORED SAFETY DEVICE
• Momentary contact to open and stop with our
WARNING
BASIC PROGRAMMING
DETERMINE THE WIRING TYPE
The functionality of the door. • Or ANY other control (automatic or manual) is shipped...
MGJ User's Guide Manual - Page 3
... TYPE WITHOUT MONITORED SAFETY DEVICE
C Requires a non-monitored safety device.
• Momentary contact to open , close and stop . • Open override that reverses when closing by any opening
device. • Wiring for Monitored Safety Devices) • Timer to Close (TTC) feature not available. NON-MONITORED SAFETY DEVICE
MONITORED SAFETY DEVICE
Sensing Edge
TO PROGRAM
Start...
MGJ User's Guide Manual - Page 4
...door in any interference received, including interference that timer is subject to 60 seconds.
Repeat steps 1 through 3 to Close. THERE ARE NO OTHER USER SERVICEABLE PARTS. Requires LiftMaster monitored safety...Begin with TTC C2
RADIO OPERATION
OPEN CLOSE STOP
X
X
X
X
X (3 button X
remote)
X
X
REVERSE WHILE CLOSING
X
TTC RESET
X
X WHEN
OPEN
X
4 The TTC will light)....
MGJ User's Guide Manual - Page 5
... . Pull emergency handle to allow arm to the appropriate instructions for Model MH
5 Door
Release Handle
MODEL MH
These operators are equipped with Hoist for your model operator. To operate the hoist:
1.
An electrical interlock will
Door
open door falling rapidly and/ or unexpectedly. • NEVER use emergency release handle to engage the hoist mechanism.
AVERTISSEMENT...
MGJ User's Guide Manual - Page 6
... MJ/MGJ
This operator has a floor level disconnect chain to operate the door again electrically. Release the disconnect chain or reset the emergency egress device to disconnect the door from door. 2. Model MJ/MGJ for instructions. See Manual Disconnect - MODEL MHS
This operator includes two methods of the operator. AVERTISSEMENT
When operator is used...
MGJ User's Guide Manual - Page 7
...safety instructions included in a safe manner and how to obstruction and reverse if sensing edge is
installed. 4. Release CLOSE button. Allow the door to make sure they are working properly.
Press the CLOSE button. AVERTISSEMENT If door did not reverse from electrocution, disconnect ALL electric power BEFORE performing ANY maintenance. Door should open .
Press OPEN button. (The door...
MGJ User's Guide Manual - Page 8
...
No power
Accessory failure
Possible component failure
OPERATOR MAKES
Operator requires adjustment
NOISE BUT DOOR DOES
NOT MOVE
DOOR DRIFTS AFTER OPERATOR STOPS
Operator or door requires adjustment
DOOR OPENS/CLOSES Operator requires adjustment TOO FAR
DOOR REVERSES UNEXPECTEDLY
Safety device activated
RADIO FUNCTIONALITY
NO RESPONSE
REMOTE CANNOT BE PROGRAMMED POOR RANGE
Remote...
MJ5011E QuickStart-2008 Manual - Page 2
...STOP CLOSE OPEN
TTC
LEARN STOP CLOSE OPEN LEDD14
1
2
3
45
6
7
3-BUTTON REMOTE CONTROL TO OPERATE AS A WIRELESS 3-BUTTON CONTROL STATION NOTE: The feature will
add 5 seconds to the Timer to 60 seconds.
A LiftMaster monitored safety device must be connected and unobstructed to 60 seconds.
Begin with door...the next open cycle.
QuickStart for the model MJ/MH/MHS door operator ...
MJ5011E Installation-2008 Manual - Page 5
...The handing is working smoothly. An unbalanced door may not reverse when required. • NEVER try to loosen, move or adjust doors, door springs, cables, pulleys, brackets or their... provided.
3
^OPEN ^CLOSE
O
STOP
1 2
ITEM 1 2 3 4 5 6
DESCRIPTION
QTY
Operator
1
Warning labels
2
3-Button station
1
Hoist hand chain (models MH and MHS only) 1
Door/Operator chain
1
Door sprocket
1
4...
MJ5011E Installation-2008 Manual - Page 14
... detect an obstruction in the path of the door. Safety Edge
Photo Eye
Sensing Edge
14 SENSING EDGES When properly connected, the sensing edge will make contact with an obstruction while the door is closing , the door will stop and typically reverse to the full open position. Photo Eyes
IMPORTANT INFORMATION ABOUT SAFETY DEVICES
PHOTO EYES When properly connected and aligned, the...
MJ5011E Installation-2008 Manual - Page 16
...AANUT X ANT
^^^^
7
TTC
LEARN STOP CLOSE OPEN
LEDD14
1
2
3
4
5
6
7
LMEP1 LMEP2 COM INTRLK STOP CLOSE OPEN
8
9
10
ITEM 1 2 3 4
5 6 7
8
9 10
DESCRIPTION Open Button Close Button Stop Button Learn Button
Timer to Close Button Purple Wire Antenna Auxiliary Antenna Connection
LED
Field Wiring Terminal Factory Wiring Connector
FUNCTION Open Door Close Door Stop Door Programs the remote...
MJ5011E Installation-2008 Manual - Page 17
... SAFETY DEVICE
B
• Momentary contact to open and stop if the pressure to the close limit. NON-MONITORED SAFETY DEVICE
MONITORED SAFETY DEVICE
ADVERTENCIA
PRECAUCIÓN
C31 C31
Sensing Edge
RESET TO C2 WIRING TYPE (Factory Default) Remove any monitored safety devices. The LED on the wiring type. CAUTION
To prevent possible SEVERE INJURY or DEATH, install reversing...
MJ5011E Installation-2008 Manual - Page 20
...understand the safety instructions, know how to the operator on power up. The door
AVERTISSEMENT should stop .) 3.
Door should close . 5.
Allow the door to the Adjustment section for operation of the photo eyes or sensing
edge. 3.
Remove the obstruction. 5. TEST REMOTE CONTROL * Requires B2 wiring type and compatible LiftMaster remote
control. Door should open direction...
MJ5011E Installation-2008 Manual - Page 22
...or damage.
➤ Verify safety eyes are aligned or safety edge is free and brake pads are engaging the brake disc. C) Door operation problem
➤ Disconnect trolley and check door for proper operation. C) Brake not functioning properly ➤ Check brake mechanism to ensure brake lever is not activated. DOOR REVERSES UNEXPECTEDLY
Intermittent Safety Device activation
➤ Check...
MJ5011E Installation-2008 Manual - Page 23
...Safety Limit Switch
Open Limit Switch
Grey
Close Limit Switch
23
AANTUX ANT
J2
TTC
LEARN STOP CLOSE OPEN LED
1
2
3
45
6
7
LMEP1 LMEP2 COM INTRLK STOP CLOSE OPEN
OPEN CLOSE STOP... Sensing Edge and/or wiring.
Check clutch adjustment....Door height or speed may exceed the range the operator can be determined by counting the number of flashes of the operator can travel.
Reverse...
MJ (BLACK LINE) Manual - Page 2
... Models MH and HMJ only. REVERSING EDGE Optional) Electric or pneumatic sensing device attached to 24 feet.
Secondary: #48 chain/sprocket. depending on door
BRAKE (Optional Solenoid actuated disc brake
BEARINGS IronCopper sintered and oil impregnated. WEIGHTS AND DIMENSIONS
HANGING WEIGHT: .........80-110 LBS. 12.69"
6.34" 6.34"
6.13"
3.63" 2.91"
MOUNTING DIMENSIONS A - OPEN/CLOSE/STOP...
MJ (BLACK LINE) Manual - Page 3
...door opening, hook the chain off to the side near the top of order. Permit the operator to be fastened securely and
with Bearing (Not Provided) Door Sprocket
5-1/2" (13.97 cm)
All MJ, MH, and HMJ series operators have dual output shafts and may not reverse when required.
• NEVER try to move or adjust doors, door...Provide a level base.
The safety and wear of the operator will...
MJ (BLACK LINE) Manual - Page 6
...nut so that door will stop in slots of your door does not have a bottom sensing edge and you wish...door travel , spin nut away from electrocution, disconnect electric power BEFORE manually moving limit nuts. OPEN Limit Switch Retaining Plate
CLOSE Limit Switch
Aux. This includes pneumatic and electric edges. WARNING
To reduce the risk of SEVERE INJURY or DEATH, ALWAYS
CAUTION install reversing...
MJ (BLACK LINE) Manual - Page 9
... gate or garage door in the electrical enclosure as shown on the clutch spring.
3. The operator will be a normally closed .
Any control with the OPEN button.
WARNING
To prevent possible SERIOUS INJURY or DEATH, install
CAUTION reversing sensors when the 3-button control station is out of
sight of the door. An electric or pneumatic reversing edge can be...
MJ (BLACK LINE) Manual - Page 13
...OPEN CLOSE STOP
RATED LINE VOLTAGE
PULL SWITCH TO OPEN & CLOSE
SAFETY EDGE
See Close Control Wiring Options Below
* - INTERLOCK SWITCH (WHEN SUPPLIED) WIRED N.O. W W
WIRING DIAGRAM
1754
OPEN
OR
COM
N.C. Y
AUX.OPEN...CLOSE
N.C.
COM
GY
GY
W R3 Y R2
BR R1
RADIO REC'R
RESISTOR
TO REVERSE MOTOR DIRECTION INTERCHANGE RED & YELLOW WIRES. Shipped from Factory) B2 WIRING - Constant ...
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