BEI Sensors ES25 Incremental Encoder - Manual

Installation Instructions for ES Series encoders
1. Use a rigid mounting bracket with a 1.8” diameter center hole (for hub clearance) or spacers to locate the
encoder face at least ¼” from end of drive shaft. Allow space for shaft extender/reducer, if required. There
will be about 8 lbs attraction force between the encoder and hub.
2. Install magnetic hub on drive shaft with magnet side out. Adjust to maintain a 1/16” to 1/8” air gap between
the encoder face and the magnetic hub.
3. Tighten hub set screw to12 in-lb.
4. Secure the encoder to the mounting bracket with screws and flat washers.
NOTE: The ES Series magnetic coupling can accommodate more misalignment but for best performance,
align the center axis of the encoder and the drive shaft within 1/8” parallel and 3 degrees angular offset.
IMPORTANT: Allow sufficient air gap between encoder and magnetic hub to accommodate axial end play of
drive shaft during operation. Severe damage may result if rotating hub contacts the encoder housing.
Magnetic hub adjustment after the encoder has been secured (if needed):
1. Place a non-magnetic spacer between the encoder and magnetic hub.
2. Carefully loosen set screw and slide hub into final position.
3. Tighten set screw and remove spacer.
NOTE: If the external hub accidentally gets stuck to the encoder during installation or adjustment, slide it
sideways to release. Do not pry against the flat face of the encoder
CAUTION: Be prepared for strong attraction of magnets that may cause the encoder or hub
assembly to move suddenly. Keep body parts and clothing from between the encoder and hub.
Keep workspace clear of metal chips and tools.
INSTALLATION EXAMPLES
HEX STAND-OFFS
BEI ES25 Encoder with
enclosed Magnetic Hub Hex spacers to fit motor –
depend on shaft length, etc.
Motor or other
drive system
External Magnetic Hub –
required for encoder operation.
BEI accessory part
Air Gap between
housing and
External Magnetic
Shaft adapter –
example: 5/8” to 1/4"
NEMA 56C ADAPTER
INSTALLATION
Motor or other
drive system
NEMA 56C adapter
Tel:805-968-0782 / 800-350-2727 | Fax: 805-968-3154 / 800-960
7230 Hollister Ave., Goleta, CA 93117 | www.beisensors.com
-2726
Specification No 02105 Rev 06/11
These commodities, technology or software if exported from the United States must be in accordance with the Bureau of
Industry, and Security, Export Administration regulations. Diversion contrary to U.S law is prohibited.