Encoder 25T Installation Manual

TECHNICAL BULLETIN
TB-540: Installation Guide for Models
25T/H, 58T/HP, and 58T/HF
The maximum recommended motor axial endplay is ±0.030." Maximum shaft TIR is 0.005."
Bore inserts
When installing the bore insert (if not already installed), ensure the small
lip on the bore insert (see Figure 1) is positioned correctly by installing the
bore insert in front of the encoder. Do not install the bore insert from the
back of the encoder. Doing so can cause damage to the encoder.
Installing encoder over shaft
Step 1
If needed, clean the motor shaft of any burrs using a fine crocus cloth.
Slide the encoder over the motor shaft. Minimum shaft engagement
required is 1.2x the bore diameter. Preferred minimum shaft engagement
required is 1.5x the bore diameter.
DO NOT USE UNDUE FORCE.
Position the encoder so the flex mount arms just touch the mounting
surface. Install screw(s) through the holes in the flex mount and tighten
onto the motor securely. (Typical torque range of 115 to 160 oz-in). For
additional security, add a drop of Loctite 222 to the threads of the screws.
Step 2
Using a 7/64" hex wrench, tighten the screw in the encoder's clamping
collar. (Typical torque range of 15 to 25 in-lb). For additional security, add
a drop of Loctite 222 to the threads of the screw. Do not allow Loctite to
run into the bore or onto the encoder bearings.
NOTE: The 3-point SE flex mount (see Figure 2) can accommodate mounting bolt
circles from 2.25" to 2.75" by rotating the flex mount.
Alignment notes
1. When turning the motor shaft by hand, the rocking movement of
the encoder should be minimal. If not, loosen the encoder clamping
collar screw and rotate the encoder bore relative to the motor shaft to
reposition the encoder until this movement is minimized.
2. Ensure that tether arm mount is positioned straight, not bent or
bowed. Load applied to the tether arm will cause damage to the
encoder.
When tightening the screws, avoid holding the motor shaft with anything that may
scar or burr the shaft.
Removal
Loosen (do not remove) the socket head screw in the clamping collar.
Then remove the flex mount screws and gently slide the encoder off the
motor shaft.
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Do not shock or strike. Do not disassemble.
An example of a Model 25T encoder
Flex arm
(SG mount shown)
Washer
Bore insert
Bore insert lip
Figure 1
An example of a Model 58TP encoder
Flex mount
(3-point SE shown)
Figure 2
Set screws
Set screws
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