Basic Unit U-ONE-LWL

UOM(HJ) 4L / UOM(HJ) 41L SIL 2

System solution u-one-lwl

Construction type

Solid shaft (flange), Solid shaft (flange / foot), Hollow shaft

Output signals / Interfaces

Switch output speed, Switch output position

  • Ø 20 mm Hollow shaft and Ø 14 mm solid shaft (flange or foot mounting)
  • Disturbance free FOC signal transmission to function modules
  • Resolution (12 bit singleturn / 12 bit multiturn)
  • Options: SIL 2 / PL d certification for speed monitoring (UOM(HJ) 41L), isolated ball bearing (hollow shaft)

The proven universal basic units

The compact basic units of the universal encoder systems are part of the first generation of this group of products. They sense and monitor speeds and positions. This solution sees the function modules housed in the switchboard, which makes them particularly compact to attach to the shaft. Disturbance free signal transmission is guaranteed per fiber optic cable, even over longer distances. The basic units are suitable for use both in new systems as well as for upgrade solutions. No additional mechanical components such as transfer gearbox, transfer couplings or speed step-up gearing are required to facilitate direct attachment. The systems are optionally certified for safety integrated speed monitoring up to SIL 2 / PL d.


Supply voltage12-30 VDC
Resolution-Multi-turn 12 bit (4096 rotations)
-Single-turn 12 bit (4096 steps per rotation)
Switching outputsVia function module in the switchboard:
-Speed switch (NO contact)  |  UO-EM-EGS 4/UO-EM-EGS 41 (SIL 2)
-Position switch (changeover contact)  |  UO-EM-ERC
Signal outputs/InterfacesVia function module in the switchboard:
-Incremental output 1024 pulses (HTL/TTL)  |  UO-EM-FG4
-CAN bus  |  UO-EM-AMC
-Modbus TCP  |  UO-EM-AME/M
Maximum rotation-Solid shaft: up to 3000 rpm
-Hollow shaft: up to 2000 rpm 
Electrical connection-Basic unit: Terminal box with 2x ST connectors FOC (50/125 µm or 62.5/125 µm) + clamp (supply voltage)
-Function module in the switchboard: Internal bus connection / terminal strip, connector
Construction type / Ø shafts-Solid shaft (B5, B35) / Ø 11 mm, Ø 14 mm with feather key
-Hollow shaft / Ø 20 mm with keyway
Device temperature range-25 °C to +85 °C
Degree of protectionUp to IP66
WeightApprox. 2.5 kg (basic unit only) + weight of the individual modules
Device optionsVia function module in the switchboard:
-Basic decoder module: UO-EM-D2 / UO-EM-D41 SIL 2
-Speed switch module: UO-EM-EGS 4 / UO-EM-EGS 41 SIL 2
-Position switch module: UO-EM-ERC
-Incremental encoder module: UO-EM-FG 4
-Absolute encoder module: UO-EM-AMC / AMP / AMS / AME-M
Mechanical options-Additional foot (solid shaft construction type)
-Isolated ball bearing (hollow shaft construction type only)
-MI: Saliferous environment
-Hollow shaft devices: Torque bracket (on request)
Special features and certificates-UOM 41L and modules UO-EM-D41, UO-EM-EGS 41: SIL 2 (DIN EN 61508); PL d (DIN EN ISO 13849)