Siemens LMV5 Quick Start Manual page 29

Figure 2-6.1
Speed sensor assembly mounting (continued)
Draw a circle concentric with the motor shaft having a
diameter of 3". This circle should also be concentric with
the motor fan cover.
Cut out a small window in the cover, about 3/4" x 3/4", or
large enough for the speed sensor to go through.
If all of this is correct, this arrangement would put the
speed sensor about 1-1/2" from the center of the shaft,
approximately in the center of the "fingers" of the speed
wheel.
Attach the speed sensor mounting bracket as shown. Only
snug the screws.
Align the bracket so that it is roughly centered on the hole
that was cut. The center of the sensor mounting bracket
hole should be approximately 1-1/2" from the center of the
shaft (fan cover).
Replace the fan cover.
Thread the speed sensor into the speed sensor mounting
bracket. The speed sensor should align so that it is
approximately in the center of one of the speed wheel's
"fingers".
If not, loosen the four screws on the bracket and move it to
achieve the proper radial alignment of the speed wheel /
speed sensor.
Tighten the screws when the correct alignment is
achieved.
To set axial alignment, thread the sensor into the bracket
until it touches one of the "fingers".
Next, back the sensor out two full revolutions. This will
achieve an axial gap of approximately 1/16" which is the
proper gap.
Matchmark the sensor, install the lockwasher and locknut,
and tighten the locknut without rotating the sensor.
Zip tie the sensor wire to the motor, if desired.
(For wiring, see Section 3)
LMV5 QSG Rev 4 Sec 2 Pg 13 www.scccombustion.com