Switching cam encoder NOCE


Catalog excerpts

Switching cam encoder NOCE - 1

Play-free electronic digital switching cam encoder with electromagnetic absolute encoder / SSI output Model NOCE  Play-free version for use instead of electromechanical switching cam encoders  For use in stationary and mobile machines and systems, particularly for power plants, wind turbines, cranes, etc.  Up to four electronically controlled switching outputs consisting of - 2 x PhotoMOS - 2 x Relay: Changeover contacts  Integrated absolute multiturn encoder with SSI interface and resolution up to 13 bits  SSI position signal and switching outputs can be preset via preset inputs  High vibration and shock resistance thanks to the robust design Robust housing in dual-chamber design in aluminium (AlMgSi1) or stainless steel (1.4305 resp. 1.4404). Shaft with radial shaft seal and ball bearing mounted in the prechamber. Electronics housed in the sealed main chamber. TWK-ELEKTRONIK GmbH Heinrichstrasse 85 Version: Ø 64 mm (standard) with clamping collar and M6 threaded holes plus two device connectors and two switching outputs. Ø 79 mm (on request) with short housing length and up to 6 switching contacts Shaft diameter 12 mm. Electrical connection for voltage supply, switching outputs and analogue data via M12 connectors or cables. The number of connectors or cables varies (up to a maximum of two) depending on version or customer specifications. The NOCE64 has four switching contacts (6 at model NOCE79 possible). The version with two contacts contains two mechanical relays with changeover contacts. The version with four contacts contains two additional semiconductors (PhotoMOS) which represent a NO contact each. Each semiconductor switching contact is separated by an Opto - Isolator from the rest potential of the NOCE, so that these switching outputs - as well as the relays – are galvanically isolated. The PhotoMOS units can switch AC and DC. All four switching contacts (NO - normally open contacts - by the relays) are closed during normal operation, thus providing a constant current flow. When a contact switching value (shaft position) is reached the appropriate contact opens. All limit values are separately adjustable for each contact. Also, contacts are open when the cam switch is not connected to power supply.

Open the catalog to page 1
Switching cam encoder NOCE - 2

Electronic digital switching cam encoder model NOCE Description General functional principle long service lives resp. wear-free PhotoMOS semicondutors which are as well galvanically separated. This involves a play-free electronic switching cam encoder (abbreviated to: NOCE) with a maximum of four galvanically separated switching outputs, which can be set by the customer and which are activated or deactivated depending on the relevant position of the drive shaft. A parameterisable multiturn absolute encoder with SSI interface plus the switching cam encoder printed circuit board with separate...

Open the catalog to page 2
Switching cam encoder NOCE - 3

Electronic digital switching cam encoder model NOCE Principle circuit diagram Principle circuit diagram 2 Version with four switching contacts and five separate preset inputs for SSI and cams. data + data - VS (0 V) Relay / cam 1 Relay / cam 2 Hall - Sensor code sense set input SINE - COSINE - Signal Interpolator - Singelturn Hall - Sensor SINE - COSINE - Signal Interpolator - Multiturn Technical Data Mechanical data  Shaft diameter: 12 mm with flattened area on one side, 11 mm  Moment of inertia (rotor):  Perm. shaft load:  Bearing service life: 250 N axial 250 N radial ≥ 109...

Open the catalog to page 3
Switching cam encoder NOCE - 4

Electrical data ■ Sensor system: ■ Operating voltage range: ■ Power consumption: ■ Resolution: ■ Measuring range: ■ Output code: ■ Absolute accuracy: ■ Repeatability: ■ Code path: ■ Temperature drift: ■ EMC standards: Interference emission: Interference immunity: ■ Serial output SSI: ■ Clock input SSI: ■ Monoflop time: ■ Clock rate: ■ Electrical connection: ASIC with HALL elements 11 VDC to 28 VDC < 2.5 W 4096 steps / 360° (12-bits), optionally 8192 steps / 360° (13 bits) 4096 revolutions (option 256 or 16 revs.) Binary (optionally Gray) ± 0.25 % / 360° ± 0.1 % / 360° CW (parameterisable) ±...

Open the catalog to page 4
Switching cam encoder NOCE - 5

Standard version Electrical and mechanical variants 01 Standard Absolute encoder interface: E SS/ Electrical connections: S Device connector M12 K Cable connection Measuring range: 16 256 Revolutions 4096 Code: R Binary / G Gray Resolution: 4096 Steps / 360°, 8192 steps / 360° at maximum Number of switching outputs: 2 2 Switching outputs, 4 at maximum (6 at model NOCE79) Housing material: A Aluminium S Stainless steel 1.4305 V Stainless steel 1.4404 Flange: K Clamped flange Design form: 64 0 64 mm (Other flange designs on request, i.e. 0 58 mm or 79 mm) NOCE Electronic digital switching cam...

Open the catalog to page 5
Switching cam encoder NOCE - 6

Function To precisely register and output the angle or the position of the shaft, the contactless electromagnetic sensor system is equipped with serial SSI interface, with the result that the measurement variable is available as a digital, serial datum. The absolute angle information present in the absolute encoder is serially and synchronously transmitted to the receiver electronics within one cycle. The essential advantages of this are the low number of data cables and extensive protection against interference (an exhaustive description of the SS/ interface is contained in TWK's SS/ 10630...

Open the catalog to page 6
Switching cam encoder NOCE - 7

Function The function ofthe switching outputs is implemented by means of relays and PhotoMOS semiconductors. The relays have changeover contacts. Each changeover contact is routed out via the relevant switching cam encoder connector for use by the customer. The contacts are galvanically separated in terms of operating voltage and the SSI output signal. The PhotoMOS semiconductors are as well galvanically separated. Two contacts of each PhotoMOS are routed out. The information regarding when which relay is to pick up and drop off again is made available to the relay control system by the...

Open the catalog to page 7
Switching cam encoder NOCE - 8

On activation of the preset function for the switching outputs in accordance with the table, the relevant switching flank (see cam diagram) is set precisely at the current shaft position. It can be ascertained that the switching output switches at this point by rotating the shaft around this position. On use of the programmer PMA-NOC-03, this can be recognised by the fact that the LED comes on and goes off. The switching contact (or LED) does not necessarily react immediately to the preset process without a shaft position change. Note: The switching flanks of the individual cams always...

Open the catalog to page 8

All TWK-ELEKTRONIK GmbH catalogs and technical brochures