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Installation, cont'd
b.
If necessary, slowly tighten one or more of the other
adjustment screws to raise a corner or side of the
surface block to horizontal.
5.
Adjust the height of the surface block to be flush with the
table surface as follows:
Since all tables have different widths, it is normal for this
to need adjustment.
a.
Hold the platform up and unplug the AC power
connector.
b.
Locate the lower limit switch assembly (figure 2-12)
inside the enclosure.
Lower Limit
Set Screw
Lower Limit
Switch
Control
Board
NOTE
Figure 2-12 — Location of lower limit switch
assembly (seen from the side)
2-12
HSA 822MS • Installation
RJ-45 connectors are removed for visibility.
A generic limit switch assembly is shown in close-up
below. The lower limit switch assembly looks similar,
but is not identical to the close-up shown, but parts of
the lower limit assembly are concealed from view.
c.
Loosen the lower limit switch
lock nut.
d.
Rotate the lower limit switch
set screw:
Limit
Clockwise to raise
Switch
the stop point of the
(Hidden)
retracted platform.
Counterclockwise
to lower the stop
point of the
retracted platform.
Adjustments do not take affect immediately. You must
use the motor mechanism to raise and lower the platform
to see the affect of your adjustment.
e.
Plug in AC power.
Do not reach tools or your hands into the area
behind the AC connectors or into the vicinity of the
power supply.
f.
Press on the surface block to raise and lower the
platform to check the adjusted height. If necessary,
repeat step 5d.
g.
When the surface block is flush with the table surface
to your satisfaction, tighten the lower limit switch
lock nut.
6.
Check that the surface block is centered in the cut-out hole.
If the surface block is not centered in the hole, adjust the
positioning of the surface block. With the installation
screws and nuts left slightly loosened, the HSA and
surface block should be able to be moved enough for the
surface block to be centered.
When the surface block is satisfactorily centered in the
hole, tighten the four 1/4" nuts that secure the top plate to
the lifting plate (figure 2-6 on page 2-7).
7.
Tighten the eight #8-32 wood screws that secure the HSA
to the underside of the table (figure 2-7 on page 2-8).
HSA 822MS • Installation
Limit Switch
Set Screw
Limit Switch
Lock Nut
Switch
Actuator
2-13
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