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4 Pelco Manual C343SM (12/98)
2.0 DESCRIPTION
The PT480 Legacy
®
Series pan/tilt units are designed for medium-duty, indoor/
outdoor use.
Only the EH4700L Legacy
®
Series environmental enclosures can be mounted on
the pan/tilt units. Pelco’s RediLINK
™
connector makes it simple and quick for you to
install an enclosure. The weight of the enclosure with camera and lens must not
exceed 20 pounds (9.07 kg).
You can easily remove the clamshell covers from the sides of the pan/tilt units to
access all internal parts without having to remove the camera enclosure. This makes
it easy to service the units and to adjust the pan and tilt limit stops.
2.1 MODELS
The PT480 Series consists of the following models:
PT480P Medium-duty, indoor/outdoor pan/tilt, 120 VAC.
PT480P/PP PT480P with preset positioning capabilities.
PT480-SL PT480P with 360° pan rotation.
PT480SL/PP PT480SL with preset positioning capabilities.
PT480-24P Medium-duty, indoor/outdoor pan/tilt, 24 VAC.
PT480-24P/PP PT480-24P with preset positioning capabilities.
PT480-24SL PT480-24P with 360° pan rotation.
PT480-24SL/PP PT480-24SL with preset positioning capabilities.
3.0 MAINTENANCE
If you need to remove the enclosure, protect the RediLINK™ connector area against
moisture, dust, dirt, etc. Failure to do so could result in a bad connection. Also,
damage to the pan and tilt unit or enclosure could occur when power is turned on.
The following servicing should be done every six months with average use.
1. Remove the PT480’s outer casing.
a. Remove the Phillips screw on each side of the pan and tilt unit.
b. Place your hands under the cover halves. Exert a strong, upward force
to release the covers from their internal latching devices.
c. Pull the cover halves away from the pan and tilt unit. Set the covers down
or hang them by the eyelets inside the covers. (The wire and hook on
which to hang the covers is not provided.)
2. Inspect the gaskets around the cover, tilt shaft, and spindle for damage.
3. Refer to Figure 1. It shows the parts locations of the tilt assembly. Look for
similar orientations of parts when adjusting the pan assembly.
4. Check the backlash adjustment.
Backlash is the slack or binding in a pan and tilt base mount. Determine back-
lash by lifting the maintenance assembly, grasping the base, and wiggling it.
There should not be any play or binding between the gear (A) and worm drive
(B). Play or binding indicates a backlash problem.
• One backlash problem involves a worm and worm gear connection loose
enough to cause slipping or tight enough to cause binding.
• The second involves a too-loose or too-tight chain, usually causing symp-
toms similar to the worm and worm gear problem–slipping or binding.