AV850 1
(OPTIONAL) LARGE MOTOR STATOR ADAPTER INSTALLATION
(Modification “700”,”704”)
For large frame GE CD motors Avtron offers a frame adapter to add an
8.5” C-face to the motor. To install the flange adapter:
1. Remove all existing adapters on the non-drive end of the motor.
2. Clean the motor flange.
3. Using the supplied hardware, bolt the flange adapter in place
(see Figure 1).
4. Apply anti-seize to the frame adapter C-face flange.
(OPTIONAL) INBOARD SEAL PLATE INSTALLATION
(Cover Plate “B” & “N”)
For installations where the AV850 will be mounted to an open frame
flange adapter, or other installation where the inner surface of the AV850
will not form a seal with the rear end bell of the motor, Avtron offers
inboard, through-shaft seal plate kits. These kits include a cover plate
and seal. See Table 3 for part numbers. To install the inboard through-
shaft seal plate kit:
1. Verify all components fit the motor shaft (rotor, V-ring seal, and
seal plate.
2. Slide V-ring seal onto motor shaft.
3. Apply a light coating of silicone lubricant or medium grade
machine oil to the outward face of the seal.
4. Use the seal plate to push the seal on the shaft; stop when the
seal plate contacts the motor face. Remove the seal plate and
push the V-ring seal an additional 0.09” [2.29mm] toward
motor.
Verify the V-ring seal is clear of the motor bearings and housing.
V-ring seal compression should be between 0.03” and 0.09”
[0.75mm-2.29mm] in final position when plate is reapplied.
5. Remove the double-stick tape protection. Align the bolt holes.
6. Stick the inner cover plate in place.
7. Mount rotor per instructions below, but increase axial position
from motor to rotor to 0.620” [15.75mm] (from 0.584”) to
accommodate the inner seal plate thickness. See Figure 3.
8. Mount remainder of AV850 per instructions on next page.
MAGNETIC SHIELD INSTALLATION
For top performance on older motors with magnetized shafts and frames
install the AV850 shield. The AV850 also has built-in shields attached to
the housing of every unit. The standard AV850 shield as provided will
fit shafts up to 3” [76mm]. For larger shafts, if desired, the shield can
be custom-cut by the customer to fit a larger bore (rec0.125”
[3.1mm] over shaft size), or the shield can be omitted, as its effectiveness
is reduced beyond a 3” bore size.
NOTE
For additional magnetic field protection, consider the -004
option for extra sensor shielding.
1. Remove the double-stick tape protection.
2. Align the bolt holes and edges with the motor C-face.
3. Stick the shield in place on the motor C-face or on top of any
inboard seal plate.
4. Install rotor as usual, but gage location from the shield.
See Figure 3.
The outer edge of the rotor may be damaged by scratches, severe
blows, and strong magnetic fields.
GENERAL
The Avtron Model AV850 SMARTach™ III is an incremental encoder
(also known as tachometer or rotary pulse generator), allowing operation
down to zero RPM. It provides a specific number of electrical Pulses Per
Revolution (PPR) that are proportional to a shaft’s revolution. The AV850
SMARTach III is a bearingless, couplingless, modular design, providing
unequaled reliability and mechanical performance.
The AV850 fits AC and DC motors with an 8.5” C (FC / 180) Face. Both
end-of-shaft and through shaft mountings are accommodated.
The AV850 Encoder consists of three or four parts: a rotor, a stator
housing, and one or two removable sensor modules. No gapping,
adjustment, or shimming is required!
An Avtron AV850 SMARTach III is equipped with one or two AV5 sensor
modules. Each module has a two-phase output (A, B) 90° out of phase,
with complements (A, B), (A Quad B Output), and a marker pulse
with complement (Z, Z). For applications which require more than 2
independent outputs, AV850 encoders may be stacked via the use of
shaft adapters (see Table 2 for part numbers). Two separate encoders
would be purchased.
Output resolution on the AV850 is determined by the sensor only. Unlike
older models, any PPR’s can be mixed and matched. Selection of the
rotor is based only on the shaft mounting requirements (and not PPR).
The AV5 removable sensor assembly has a diagnostic package that
includes Adaptive Electronics and a Fault-Check output. With this
package, the SMARTach III can maintain itself, and let you know if there
is a problem before the problem causes unscheduled downtime.
SECTION II: INSTALLATION
GENERAL
The motor must comply with NEMA MG1 for dimensions, face runout, and
shaft runout. Axial float or endplay must be less than +/-0.100” inch.
INSTALLATION HARDWARE
Installation hardware required is attached to each assembly.
Equipment needed for installation
Model: AV850 SMARTach™ III
8-1/2” FC FACE MOUNT MODULAR
Equipment Needed for Installation
Provided
Optional
Not Provided
AV850 Encoder
- Washer, Spring Lock
1/2 (4)
- Hex Hd. Cap Screw
1/2-13 x 3.00 (4)
Rotor
- Rotor Installation
Hardware Kit
- Anti-Seize
Compound (copper)
- Thread Locker (blue)
- A35226 Gauge or
A25355 M285/
AV850 Rotor
Gauge Block
- Inboard Through-
Shaft Seal Plate
- Outboard Through-
Shaft Seal Plate Kit
- Silicone Lubricant
or 20 Weight
Machine Oil
- Dead Blow Hammer
- Large Frame
Adapter Kit
(Modification “700”)
AV850 Shield Kit
(A35355)
- 3/4” Wrench
- Phillips Screwdriver
- 7/16” Nut Driver
- Dial Indicator
- Vernier Caliper
- 3/32” Hex Wrench
(T-Handle style) (thru
shaft rotors only)
- 3/16” Hex Wrench
(cam screw rotors only)
- 9/16” Wrench (end-of-
shaft rotors only)
