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Maintenance and Modifications, cont'd
Safety Switch — Location only
The safety switch (figure 3-9) stops the downward motion of
platform when it encounters an obstruction to its smooth
operation. If an obstruction is present that blocks the platform's
travel, the stepper motor's carriage lifts and activates the safety
switch. The HSA's motor logic automatically reverses the
platform's motion and raises the platform to the upper position.
The carriage typically reverses with less than twelve pounds of
pressure applied to the obstruction.
Figure 3-9 shows the HSA with the shroud removed.
Stepper
Motor and
Carriage
Assembly
Safety
Switch
Figure 3-9 — Location of the safety switch
(seen from the side)
The safety switch cannot be adjusted.
3-12
HSA 822MS • Maintenance and Modifications
Replacing the Control Board Assembly and
Power Supply Assembly
The control board assembly (figure 3-1 on page 3-2,
power supply assembly (
follows:
1.
Disconnect AC power.
2.
Remove the shroud. See Removing and Replacing the
Shroud, on page 3-6, step 1.
3.
From the underside of the enclosure, reach into the cable
access holes (figure 3-1 on page 3-2, item
tie wraps (
shows the tie-downs) that route the AAP
5
cables and network (CAT 6) cables inside the enclosure.
4.
Remove the three screws (figure 3-1 on page 3-2, item
that secure the assembly to be replaced to the underside of
the enclosure.
For the control board assembly, screws indicated by an
asterisk (*) on figure 3-1 are accessible from the top
(inside the enclosure).
Do not remove screw
This screw does not secure the power supply assembly in
any way; rather, it provides structural support to the
enclosure.
5.
Remove all connectors from the assembly to be replaced.
6.
Remove the assembly from the enclosure.
7.
Secure the replacement assembly in the enclosure with the
screws removed in step 4.
8.
Reconnect all connectors removed in step 5.
9.
Retie all of the network (CAT 6) and AAP cables removed
in step 3 to the tie-downs (figure 3-1 on page 3-2, item
on the assembly that was replaced.
10.
Reinstall the shroud. See Removing and Replacing the
Shroud, on page 3-6, step 3.
HSA 822MS • Maintenance and Modifications
) and the
1
) can be replaced, if necessary, as
2
), and cut the
3
)
4
(figure 3-1 on page 3-2).
X
)
5
3-13
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