Optical encoders for standard drives in heavy industry

FG 2 / FGHJ 2

  • Hollow shafts up to Ø 17 mm, solid shaft Ø 11 mm (flange mounting)
  • Bigger bearing for greater load-bearing capacity
  • Up to 4096 pulses HTL / TTL, others on request
  • Options: Second incremental output, FOC transmitter, additional overspeed switch
Incremental encodersOverspeed switches
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Optical encoders for standard drives

The incremental optical encoders FG 2 (solid shaft) and FGHJ 2 (hollow shaf) ensure the speed of standard, auxiliary and secondary drives is reliably measured. When attaching the optical encoder with an isolated coupling (solid shaft) or an isolating hybrid bearing (hollow shaft) they protect the drivetrain against damaging shaft currents. Short-term availability and additional options ensure that the optical encoders can be deployed in a wide variety of applications and are also suitable as simple replacement solutions for encoders supplied by third-party manufacturers. The axial terminal boxes offer sufficient space for straightforward wiring. The plug-in connectors are vibration-proof by design to ensure these are permanently secure even under extreme conditions.

Technical Data

Supply voltage

12-30 VDC

Signal amplitude


Pulse rate

1 - 2048, 4096 – others on request.

Output signals

0°, 90°, N and inverted signals

Maximum frequency
  • Solid shaft: up to 7000 rpm / 200 kHz
  • Hollow shaft: up to 6000 rpm / 200 kHz
Electrical connection
  • Terminal strip in a terminal box
  • Fixed cable (0.6 - 4 m)
  • Plug-in connection ITT Cannon (pin configuration compatible with comparable devices from third-party manufacturers following consultation)
    Options: Mating connector set comprising a 90° circular connection and EMC cable gland
  • FOC connector in a terminal box
Construction type / Ø shafts
  • Solid shaft (B5) / Ø 11 mm with feather key
  • Hollow shaft (isolated bearings) / Ø 12 mm, Ø 16 mm with clamp, Ø 17 mm with taper 1:10
Device temperature range
  • -25 °C to +85 °C
Degree of protection



Approx. 2 kg

Device options
  • S: Electronic overspeed switch; switching speed preset ex works
  • FOC: Signal transmission via fiber optic cable 50 / 125 μm or 62.5 / 125 μm
  • AKK: Second system with dedicated scanner and electronics for additional incremental output, 2 different pulse rates possible
Mechanical options

Hollow shaft devices: Torque bracket (on request)

Special features and certificates
  • UL/CSA
  • FGHJ 2: Increased dielectric strength up to 3 kV (direct mounting to drive-controlled motors)    



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