
6
Mounting the HEDT-9140
with an Alignment Tool
The HEDS-8905 alignment tool is
recommended for mounting the
HEDT-9140 module with Side B
as the mounting plane. This tool
can only be used when the HEDT-
9140 module is mounted with the
HEDS-5140 (codewheel with
hub). The HEDS-8905 tool fixes
the module position using the
codewheel hub as a reference. It
will not work if Side A is used as
the mounting plane.
The following assembly procedure
uses the HEDS-8905 alignment
tool to mount an HEDT-9140
module and an HEDS-5140
codewheel:
Instructions:
1. Place codewheel on shaft.
2. Set codewheel height: (a) place
alignment tool on motor base
(pins facing up) flush up against
the motor shaft as shown in
Figure 3. (b) Push codewheel
down against alignment tool. The
codewheel is now at the proper
height. (c) Tighten codewheel
setscrew and remove alignment
tool.
Some motors have a boss around
the shaft that extends above the
mounting plane. In this case, the
alignment tool cannot be used as
a gage block to set the codewheel
height as described in 2(a), (b),
and (c).
If boss is above
mounting plane:
Slide module
onto motor base, adjusting height
of codewheel so that it sits
approximately in the middle of
module slot. Lightly tighten set-
screw. The codewheel height will
be more precisely set in step 5.
3. Insert mounting screws
through module and thread into
the motor base. Do not tighten
screws.
4. Slide alignment tool over
codewheel hub and onto module
as shown in Figure 4. The pins of
the alignment tool should fit
snugly inside the alignment
recesses of the module.
If boss
is above mounting plane:
The pins of the tool may not mate
properly because the codewheel is
too high on the shaft. Loosen
codewheel setscrew and lower
codewheel slightly. Retighten
setscrew lightly and attempt this
step again.
5. While holding alignment tool in
place, tighten screws down to
secure module.
If boss is above mounting plane:
Push codewheel up flush against
alignment tool to set codewheel
height. Tighten codewheel
setscrew.
6. Remove alignment tool.
Figure 3. Alignment Tool is Used to Set Height of
Codewheel.
Figure 4. Alignment Tool is Placed over Shaft and onto
Codewheel Hub. Alignment Tool Pins Mate with Aligning
Recesses on Module.