Switching cam encoder NOCA


Catalog excerpts

Switching cam encoder NOCA - 1

Play-free electronic switching cam encoder with electromagnetic absolute encoder / analogue output Models NOCA64 und NOCA120 ■■ 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 - Relay: Changeover contacts - PhotoMOS: Normally open contacts ■■ Integrated absolute multiturn encoder with analogue interface 0(4) ... 20 mA or 0 ... 10 V ■■ Analogue output and switching outputs are adjustable ■■ High vibration and shock resistance thanks to the robust design Contens - Robust housing manufactured from seawater-proof aluminium (AlMgSi1) or stainless steel (material: 1.4305 optionally 1.4404). - Shaft fitted with ball bearings bears the magnet for recording the angular position and the drive gear of the multiturn transmission for absolute revolution counting. - Shaft and transmission are located in the prechamber. Sealed off from this, the main chamber contains all electronic components for position recording, evaluation and output. - Available Versions: Ø 64 mm (standard) with clamping collar and M6 threaded holes plus two device connectors. 2 x relay and 2 x PhotoMOS at maximum. Ø 120 mm (optional) with clamping collar, M6 threaded holes and synchroniser groove. 4 re- lays at maximum. Ø 79 mm (on request) with short housing length Electrical connection for voltage supply, switching out puts and analogue data via M12 connectors or cables. The number of connectors or cables varies (up to a ma- ximum of three) depending on version or customer spe- cifications. TWK-ELEKTRONIK GmbH Heinrichstrasse 85

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Switching cam encoder NOCA - 2

Electronic switching cam encoder model NOCA Description General functional principle This involves a play-free electronic switching cam encoder (abbreviated to: NOCA) with a maximum of four galvanically separated switching outputs (cams), 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 analogue interface plus the switching cam encoder printed circuit board with separate controller are integrated into the compact housing. The analogue signal and switching outputs...

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Switching cam encoder NOCA - 3

Technical data Electrical data ■ Sensor system: ■ Operating voltage range: ■ Power consumption: ■ Resolution: ■ Measuring range: ■ D / A converter: ■ Output signal: ■ Absolute accuracy: ■ Repeatability: ■ Signal path: ■ Temperature drift: ■ EMC standards: Interference emission: Interference immunity: ■ Electrical connection: ASIC with HALL elements 18 VDC to 28 VDC < 2.5 W 4096 steps / 360° (12-bit) 4096 revolutions (option 16 or 256 revs.) 12-bit (option 16-bit) 0 (4) ... 20 mA or 0 ... 10 VDC ± 0.25% / 360° ± 0.1% / 360° CW or CCW (parameterisable) ± 30 ppm / K typ. EN 61000-6-4 EN...

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Switching cam encoder NOCA - 4

Standard version Electrical and mechanical variants 01 Standard Absolute encoder interface: S Device connector M12 K Cable connection Signal path: Measuring range - ex-works: 5760° 16 revolutions (arbitrary values up to 1.474.560° = 4096 rev. possible) Number of switching outputs: 2 2 switching outputs, 4 at maximum Housing material: A Aluminium S Stainless steel 1.4305 V Stainless steel 1.4404 Flange: K Clamped flange (NOCA 64) M Assembly flange (NOCA 120) Design form: 64 0 64 mm 120 0 120 mm (Other flange designs on request, i.e. 0 58 mm) NOCA Electronic switching cam encoder with...

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Switching cam encoder NOCA - 5

Electronic switching cam encoder model NOCA Analogue output Teach-in function The standard output characteristic curve has a symmetrically divided underflow and overflow range up to the maximum measuring range. See characteristic curve on page 6. To precisely register and output the angle or the position of the shaft, the contactless electromagnetic sensor system is equipped with a 12-bit D/A converter, with the result that the measurement variable is available as an analogue signal from 0 (4) to 20 mA or 0 to 10 V. On request 16 bits are possible. The information on the shaft's precise...

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Switching cam encoder NOCA - 6

Characteristic curve Basic setting 16 revolutions = 5760° with under- and overflow up to +/- 2048 revolutions. Other characteristic curve versions on request, e.g. multiple characteristic curve repetition in the measuring range. Parameterisation of the analogue output The parameters for the measuring range or zero point and end value plus signal path and preset value can be set by the user according to the circumstances at the application location. Two multifunctional inputs MFP 0 and MFP 1 are provided in connector S2 for this purpose. The input circuit for the multifunctional inputs is E1...

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Switching cam encoder NOCA - 7

How do the cams react on the analogue teach function? Only when using the 'preset function' at the analogue parameterization the switching positions of the cams will follow. When the analogue measuring range is modified the switching positions of the cams will not follow. They have to be set new to match them to the new slope of the analogue signal. The following way of parameterization is recommended: 1. Set behavior of analogue signal. 2. Set switching positions of cams. 3. Do 'analogue preset' to set analogue signal and switching positions of all cams to the desired shaft position. Or:...

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Switching cam encoder NOCA - 8

Switching outputs Switching output relay electrical data ■ Maximum switching current: ■ Maximum switching voltage: ■ Response time: ■ Resistance ON: 1.0 A at 30 VDC/VAC, 0.5 A at 60 VDC/VAC 60 VDC / VAC Note: The effective maximum voltage is dependent on the connector into which the switching contacts are integrated: M12, 12-pin: max. 30 VDC, M12, 8-pin: max. 60 VDC. 3 ms (ON and OFF) < 0.5 Ohms ■ Relay service life: > 5 x 105 operations ■ Switching hysteresis: 10 digits (~1°) PhotoMOS output electrical data ■ Maximum load current: ■ Maximum load voltage: ■ Maximum power dissipation: ■ On...

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Switching cam encoder NOCA - 9

Preset inputs for switching contacts S1 to S4 Table for preset inputs (PRE) for NOCA 64 Reaction of S1 and S3: descending flank in CCW direction, of S2 and S4: descending flank in CW direction Input circuit for preset inputs (PRE): E1 Input E1 active "high" Ii Log 0 < 5 V or not connected Log 1 = 11 ... Vs E1 specificationTiming diagram for PRE settingsHandling of PRE 1 and PRE 2 in combination (Table above) Handling of PRE 1 to PRE 4 (Table on page 10)Example: Preset of switching output 2. Logical 1 PRE2t > 0,5 s Logical 0 Logical 0 Date: 15.11.2018 Page 9 of17 Document no. NOC 12393 IE

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