Product Details

AV850

Time isn't Money. UPTIME is Money!

Heavy Mill Duty
Installation in Minutes!
Up to 50000 PPR
Removable Sensors
Wide-Gap Technology, No Air Gap Adjustment Required
Mounts Securely to Motor
Outputs Fully Short Circuit Protected
Self-Diagnostic LED & Alarm Output
Sealed Electronics
-40°C to +100°C Operation
3 Year No-Hassle Warranty
Excellent for Gear Motors and Brake Applications

CONFIGURE & PRICE ENCODER

Product Manual

Data sheet

Accessories

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Description

SMARTach™ III Magnetic, Modular Encoder, 8.5" C-Face Mount

AV850 SMARTach III heavy mill duty modular magnetic encoders fit standard 8.5" FC-Face motors. Other models, from 115mm to 12.5", are available to fit other motor sizes, and hazardous duty models: XR850 and XPH8 intrinsically safe and SV850 functional safety encoders are also available.

Quite simply, the AV850 is designed to eliminate encoder failures.

All AV850 electronics are fully encapsulated. There are no moving wearing parts. AV850 sensors locate over 4X farther from the rotor than the competition; no more sensor/rotor grinding!

Miswiring an encoder is common– and it shouldn’t cost you time or money. The AV850 has full output short circuit and reverse voltage protection, plus surge protection. AV850 SMARTach III sensors digitally self-tune the outputs to eliminate drive trips caused by poor encoder signals. The universal 5-24V design drives longer cables and is protected against wiring errors.

Adaptive Electronics: At power-up you know you installed it right! The green LED tells you your AV5 Sensor is aligned with the rotor and reading signal. If at any time, the AV5 cannot produce consistent signals, the LED changes to red and the optional remote alarm contact activates. However, the encoder keeps working to give you time to schedule service. Even wiring errors and short circuits that cause an over-temp situation will be detected and indicated by changing the LED to orange.

If you think you need to replace your drives to end your encoder failures, try a better encoder instead. Specify AV850!

Specifications

Operating Power (Each Sensor): 5-24V*
Current: 100mA (nominal, no load)
Output Format: A Quad B with marker (A, /A, B, /B, Z, /Z)
Frequency Range:
@5V, @1m cable, 250 kHz Max
@24V, @300m cable, #8 output, 45 kHz Max
Maximum Cable Length: 1000'
PPR: 4 - 50000***
Speed: 6000 RPM Max****
Rotor Positioning: Up to +/-0.100" movement/misalignment
Sensor-Rotor Gap: 0.045", +0.015/-0.030" [1.14mm+0.38/-0.76mm]
Temperature: -40° to 100°C (rotor -40° to 150°C peak non-continuous)
Electronics: Fully Encapsulated, IP67**
Vibration: 18G
Shock: 1 meter drop test
Weight: 9lbs. [4kg]; 11lbs. [5kg] dual

* Electrical specifications for SMARTach III model (serial #30,000 or higher), consult Nidec Industrial Solutions for earlier model specifications.
** Certain connector options may reduce IP rating.
***(PPR) Standard maximum PPR is 5000. Consult Factory with your application for PPRs up to 50,000.
**** (Speed) Maximum RPM may be limited for PPR > 2,500. Consult Factory with your application.

All dimensions are in inches [millimeters].
Specifications and features are subject to change without notice.

Rotors greater than 4.00" [100mm] do not include V-ring seals.

More Advantages

SMARTach II sensors find problems before they cause failure
Replaces Northstar/LakeShore RIM8500™, NexGen 8500; Avtron M193B, M285; GE AN-DG models
Resists motor and brake interference noise
Reverse voltage protection
Mix and match any PPRs with any rotor
Permits axial movement up to +/-0.100" [+/-2.54mm]
Universal rotor for all GE CD style and many Reliance motors.
Optional overspeed switch
Optional shaft grounding

Markets & Applications

Industry	Mining	General	Wind Power	Pulp & Paper	Oil & Gas	Marine	Metals	Machinery	Crane & Hoist
Light Mill Duty HS4 Encoder Programming Tool Cables and Connectors Encoder Couplings RUSH AV4 AV25 HS25A AV6A HS6A K661 AV6M AV4 HS35A AV20
Mill Duty M185 Cables and Connectors Encoder Couplings AV32 HS35M HS6M K661 M3 HS35X
Heavy Mill Duty XRB3 AVSK Cables and Connectors AV56S XR45 AV44 AV45 AV56A XR5 XR12 AV85A HS45 K661 XP5 XR115 XR125 XR4F XR56A XR850 XR85A AV115 AV125 AV67A HS44 AV850 SMT1
Severe Mill Duty XRB3 Cables and Connectors Encoder Couplings AV5 AV30 XR5 AV12 XR12 HS40 K661 M6C XP5 XPH1 XPH8 XR485 XR685 M7 AV685 AV485 AV30B

Avtron's AV850 encoders replace many competitive models, including:

Lakeshore/Northstar: RIM TACH 8500, RIM 8500, RIM 8.5, R85Q, R8, RT8, NexGen encoders

General Electric: GE AN-DG encoders
36C696957AB-1, 36C696957AB-2, 36C696957AA001, 36C696957AA002, 36C696957AA003, 36C696957AA004
36A160614AK-001, 36A160614AK-002, 36A160614AK-003, 36A160614AK-004 , 36A160614BA-002

Combine AV850 with a K661 to make a great replacement for analog tachogenerators flange mounted to GE CD frame DC motors including:
General Electric GE BC42, BC44, BC62

AV850 also directly replaces older encoder models from Avtron, including: SLAPTach M190, M192, M193B, SMARTach M285 encoders (with M284 sensors)
For direct model replacements, try our cross reference page
or
Contact Us

Accessories

Cables and Connectors

PRODUCT GLOSSARY

A Quad B

A Quad B refers to the set of output quadrature signals from an incremental quadrature encoder to indicate speed and direction, including complements: A, A NOT, B, B NOT (, , , ). Most Avtron encoders offer A Quad B output at no extra cost. For more information on quadrature- Wikipedia: http://en.wikipedia.org/wiki/Quadrature_phase
AN-DG

AN-DG was a digital encoder sold by General Electric, 8.5" NEMA FC face mount. It is now obsolete. It may be directly replaced by an Avtron AV850 encoder.
Analog Tachogenerators

Also known as DC tachogenerators, Analog Tachogenerators are small DC generators that output a voltage in proportion to speed. They cannot indicate position, only speed and direction of rotation. A common mounting style of analog tachogenerator was the General Electric BC42 and BC46 Series with NEMA 56C Foot or Face Mount, and the smaller 5PY flange mount unit. Analog tachogenerators can be replaced with modern digital encoders. Avtron offers a complete retrofit package using the existing flange adapter and coupling already on the motor and a Frequency to Voltage Converter like the Avtron K661, which resides in the drive cabinet.
Axial Shaft Movement

Motor shaft movement in or out, relative to the ends of the motor. Often motors that use roller or sleeve bearing construction have more axial shaft movement. Most Avtron modular encoders tolerate +/- 0.050" of axial movement maximum. Use hollow shaft encoders for high axial movement motor styles, such as MD motors. Most competitors� modular encoders tolerate much less axial movement than Avtron products.
BC42

An analog tachogenerator manufactured by General Electric, part number 5BC42xxxxx, NEMA 56C face or foot mount, coupled. It is now obsolete. It may be replaced by an Avtron encoder combined with a K661 converter solution.
BC46

An analog tachogenerator manufactured by General Electric, part number 5BC46xxxxx, NEMA 56C face or foot mount, coupled. It is now obsolete. It may be replaced by an Avtron encoder combined with a K661 converter solution.
C-Face

A machined flange or elevated/recessed face provided on motors for mounting accessories. Typically provided on the drive end for gearbox/load mounting, C-faces may also be provided on the non-drive end for mounting encoders, brakes, and other accessories.
Cam Screw Rotor�

A Cam Screw Rotor eliminates the problems associated with slipping rotors of other types; it uses two cam (eccentric) head screws. The screws are preloaded into the rotor; simply rotate them (approximately 90�-180�) to fully engage the shaft (4-6 ft-lbs) using a standard hex (Allen) wrench. Cam screw rotors are available on AV850, AV56, AV67, AV85, and AV115 THIN-LINE II� encoders. Cam Screw Rotor Patent # 7,485,997. Cam Screw Rotor� is a trademark of Avtron.
Encoder

A device which indicates position and speed via a set of digital outputs. Incremental encoders output quadrature (A Quad B) signals, and may add a marker pulse once per revolution. Absolute encoders typically indicate position via a digital message, a set of parallel outputs, or analog values.
Face or Flange Mount

A machined surface (NEMA 56C, NEMA FC) on the non-drive end of the motor is used to mount bearingless or pancake encoders such as Avtron AV56 THIN-LINE II� encoders. Solid shaft, coupled tachometers also flange mounted using flange adapters, also called flowerpots.
Flange Adapter

A Flange Adapter provides the NEMA 56C motor mounting face and properly locates the encoder shaft. The encoder shaft and motor shaft are then connected using a flexible coupling. (Drawing "A") Often flange adapters can be eliminated by directly mounting a modular encoder such as an Avtron AV125, AV850, AV56, AV67, AV85, AV115 unit on the motor flange. (Drawing "B")
Heavy Mill Duty

Heavy Mill Duty encoders are designed to withstand temperature cycling, extreme temperatures, contaminants, bearing loads, and physical force.
Industrial EPIC

The preferred encoder connector of most users in North America. It contains a full size terminal strip and, unlike the MS connector, requires no soldering for quick field connections. Avtron offers pin-for-pin exact replacements for competitors� models using industrial EPIC� style connectors. EPIC� is a registered trademark of the Lapp Group.
MS Connector

The most used encoder connector style in North America. Available in 6, 7, and 10 pin versions, with 10 pins being the most common. Avtron offers pin-for-pin exact replacements for competitors� models using MS connectors. MS connectors are extremely reliable but require soldering. Many users prefer industrial EPIC � style connectors instead. EPIC� is a registered trademark of the Lapp Group.
Magnetic Encoder

Magnetic and magnetoresistive encoders typically use a magnetized rotor with north and south poles lined up around the perimeter of the disk. A magnetoresistive sensor detects the transitions, and these are the counts or pulses generated by the encoder. Magnetic encoders withstand dirt, dust, water, and temperature changes far better than optical encoders.
Magnetic Rotor

A magnetized disk with multiple north and south poles lined up around the perimeter of the disk. A magnetoresistive sensor detects the transitions and generates the pulses generated by the magnetic encoder.
Magnetoresistive Sensor

A sensor that detects the magnetic poles on an encoder's magnetic rotor and transforms them into pulses. Avtron magnetoresistive (MR) sensors use advanced technology to reject external magnetic signals such as brake solenoids and motor magnetic fields. MR sensors enable Avtron magnetic encoders to ignore dirt, oil, water, and other contaminants.
Marker Pulse

The Marker Pulse occurs once per revolution. The purpose of the marker pulse is to provide a repeatable home position location for positioning applications. The marker pulse is often abbreviated as "�Z" or "Z" in the USA and "C" or "N" in Europe.
Modular Encoders

Modular Encoders mount to a machined C-face or flange adapter on the motor (drive or non-drive end). Modular encoders consist of a rotor that mounts on the shaft, and a stator that bolts to the motor frame. Modular encoders are very rugged, and Avtron encoders feature Wide-Gap sensors to avoid complex shimming or fitting to the motor. Modular C-face encoders are typically used on DC motors; but some AC motors, such as Rockwell�s RPM III AC and Marathon�s Blue and Black Max motors, have C-faces standard on the non-drive end for mounting an encoder.
NEMA FC

A NEMA FC face mount is a 8.5" flange with (4) bolts located in a 7.25" circle. Originally used for mounting solid shaft, coupled tachometers using flange adapters, the NEMA FC 8.5" face is a standard for mounting modular encoders. (Drawing "A") Avtron AV85 and AV850 encoders mount directly on NEMA FC 8.5" faces. (Drawing "B")
PPR

Pulses Per Revolution. Most Avtron encoders output quadrature pulses, with four times as many lines as pulses. Often lines can be counted in the drive/speed controller for higher resolution applications.
Rotor

The disk-shaped portion of the modular encoder that is mounted on the motor shaft. Avtron modular encoders use magnetic rotors.
Stub Shaft

The portion of the shaft (often on the non-drive end of the motor) used to mount an encoder. To add an encoder to a motor or other shaft that lacks enough extra shaft length to install the encoder, an additional shaft length is added. The stub shaft is threaded into the center of the motor shaft, or the existing motor shaft is enclosed in a sleeve that grips the shaft. Avtron offers many standard and custom stub shafts.
Wide-Gap Technology

Avtron encoders use special optical sensors and magnetoresistive sensors, combined with proprietary circuit designs to allow the sensor to be located much farther from the magnetic rotor or optical disk. This eliminates sensor crashes and makes mounting easy and forgiving of mechanical variation.

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AV850

Description

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Severe Mill Duty

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