SV850 SAFETach™ III Incremental Encoder
SV850
1
www.avtronencoders.com
Nidec Industrial Solutions
243 Tuxedo Avenue | Cleveland, Ohio 44131
+1 216-642-1230
Incremental Encoder
ENCODER INSTRUCTIONS
Rev: 001
ROTOR INSTALLATION
Use the dial indicator gauge to ensure motor shaft runout (TIR) does not
exceed (0.004”) [0.10mm]. Apply anti-seize compound to the shaft.
CAUTION
Do not strike the encoder or rotor at any time. Damage
will result and the warranty will be void. At installation,
clean and remove paint and burrs from motor shaft and
mounting face. Apply anti-seize compound (supplied) to
each EXCEPT CAM SCREW ROTORS.
NOTE
If optional inboard seal plate and/or magnetic shield is
used, gage the rotor location from the shield/seal plate(s).
Ensure the rotor label marked “this side out” is facing
away from the motor.
GENERAL
The Avtron Model SV850 SAFETach™ 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 SV850
SAFETach III is a bearingless, couplingless, modular design, providing
unequaled reliability and mechanical performance in a functional safety
enviroment.
The SV850 fits AC and DC motors with an 8.5” C (FC / 180) Face. Both
end-of-shaft and through shaft mountings are accommodated.
The SV850 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 SV850 SAFETach III is equipped with one or two SV5 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, SV850 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 SV850 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 SV5 removable sensor assembly has a diagnostic package that
includes Adaptive Electronics and a Fault-Check output. With this
package, the SAFETach 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
The outer edge of the rotor may be damaged by scratches, severe blows,
and strong magnetic fields.
Equipment Needed for Installation
Provided
Optional
Not Provided
SV850 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/
SV850 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”)
SV850 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)
