Linear HSLG, Installation Manual

HSLG OPERATOR INSTALLATION GUIDE

- 24 -

TROUBLESHOOTING

Operator fails to start:

A.  If the operator has been running a large number of cycles, 

the motor may have gotten hot and tripped the overload. 
Allow the motor to cool down and the overload will reset 
automatically.

B.  Make sure you have power at the master distribution panel 

and that the power has not been turned off. 

C.  The secondary fuse on the control board may have blown. 

Replace the fuse (refer to control box parts list on pages 

27

 [single phase] or 

28

 [three phase] for part number 

information).

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 tight-

en   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 for proper tension on all limit chains to be sure 

there is no jumping taking place. Mark one tooth and its 
corresponding link and run the gate. If the marks have 
moved, the chain is skipping.

B.  Check the setscrews in limit cams and limit sprockets for 

tightness. In rotary limit boxes, check the rotary limit nut 
for sloppiness or stripped threads. Replace if necessary.

C. Check the chain tension along the output sprocket and 

idlers. Mark the chain and one tooth of the sprocket as 
described above and run the gate. Check for jumping.

Gate stopping part way open or closed
  (but no visible obstruction):

A.  The control board 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 ad-
justing 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 and an 
alarm will sound.

C. An obstruction signal from an accessory wired to the 

obstruction input may have triggered falsely. Check the 
control board for lit L.E.D. indicators for any of the following 
inputs: safety, shadow, open obstruction, close obstruc-
tion, 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 

12

 for 

details on the control board indicators.

Gate staying open with automatic system:

A.  If there are vehicle detectors in your machine which are 

set up for reverse, one of your loops or loop detectors may 
be sending a false signal. Disconnect the wire harness 
and try running the operator.

B.  An opening or reversing device may be stuck or malfunc-

tioning. 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.

HOW TO ORDER REPLACEMENT PARTS

Use the part numbers listed on the following pages. Contact your 

local LINEAR dealer 

or 

distributor

 to order parts.

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.