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Troubleshooting
Contacting Technical Support
For technical questions regarding Linear gate operators, contact the
Technical Services Department at:
1-800-421-1587 from 5:00 AM to 4:30 PM Pacifi c time
Operator fails to start
A. If the operator has been running a large number
of cycles, the motor may have become too hot and
tripped its thermal overload breaker. Allow the motor to
cool down and the thermal overload breaker will reset
automatically.
B. Make sure you have power at the master distribution
panel and that the power has not been turned off.
Motor operates, but gate does not move
A. In operators with torque limiters and friction pad clutches,
check for signs of slipping. You can mark the sprocket
and clutch with a yellow or white grease pen and watch
for the lines to move apart if slipping is taking place.
Adjust the torque limiter tighter if this is the problem.
B. Check for broken chain or worn belts.
C. Check all setscrews on pulleys and sprockets and tighten
them if necessary, and check for keys which may have
fallen loose from keyways.
Motor sounds like it is working harder than normal
A. Make sure the gate is moving freely and without binding
throughout its entire travel.
B. Check the drive chain for obstructions (if the operator
has one).
C. If the operator has an internal brake mechanism, make
sure it is releasing.
Limit switch getting out of time
A. Check the setscrews in limit cams for tightness. Replace
if necessary.
1. Supply the model number and serial number of your operator.
2. Specify the quantity of pieces needed and order by part number and name of part.
3. State whether to ship by freight, truck, parcel post, UPS or air express.
4. State whether transportation charges are to be prepaid or collect.
5. Specify name and address of person or company to whom parts are to be shipped.
6. Specify name and address of person or company to whom invoice is to be sent
SG • SG-D Barrier Gate Operator Installation Guide
How to Order Replacement Parts
Use the part numbers listed on the following pages.
Contact your local Linear dealer or distributor to order parts.
Gate stopping part way open or closed
(but no visible obstruction)
A. The Controller may have received a false obstruction
input triggered by current sensing set too low. Make sure
the gate moves freely through its entire travel before
adjusting the current sensing.
B. The Maximum Run Timer may have counted down and
expired. This can be caused by having the timer set too
low, if a chain or belt is broken, or if a sprocket or pulley
is slipping. When the timer expires, the gate stops.
C. An obstruction signal from an accessory wired to the
obstruction input may have triggered falsely. Check the
control board for lit indicators for any of the following
inputs: safety, shadow/reset, open obstruction, close
obstruction, stop, etc. If any are lit when the operator
should be running, remove all devices hooked to that
function and hook them up one at a time and try to run
the operator until the problem device is found. Refer to
Page 8 for details on the control board indicators.
Gate staying open with automatic system
A. If there are vehicle detectors used with the operator, one
of the loops or loop detectors may be sending a false
signal or needs to be reset. Observe the indicators on
the loop detector. Unplug the detector and try running
the operator.
B. An opening or reversing device may be stuck or
malfunctioning. Try disconnecting these devices and
hook them back up one at a time and try running the
operator until the malfunctioning device is found.
C. Make sure the close limit switch isn't activated. If it is, the
operator will think the gate is already closed.
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P1277 Revision X2 8-11-2011
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