U- / V-encoder

The following data are typical guidelines and can therefore deviate for the specific motor.

Encoder type	Technical description	Manufacturer / designation

U	Absolute encoder ( ) Singleturn ( ) Digital ( ) Analog ( )	Sick Stegmann SEK 37
	Digital resolution: 9 bit/revolution
	Analog resolution: 16 periods/revolution
	Measuring principle: capacitive ( )
	Protocol: Hiperface
	Electronic type plate ( )

V	Absolute encoder ( ) Multiturn ( ) Digital ( ) Analog ( )	Sick Stegmann SEL 37
	Digital resolution: 9 bit/revolution
	Analog resolution: 16 periods/revolution
	Measuring principle: capacitive ( )
	Protocol: Hiperface
	Electronic type plate ( )

Principle

The transmitter circuit board has a coarsely resolving disk track with three pulses per rotation and a finely resolving track with 16 pulses per rotation. The receiver circuit board situated opposite has two conductive tracks with which the coarse and fine pulses are recorded respectively. The pulses are generated or modulated through a toothed rotor, which changes the dielectric between the sender circuit board and the receiver circuit board through its rotation.

The multiturn characteristic of the V encoder is achieved through a mechanical gearbox as well as magnets and Hall sensors.

Output signal Hiperface

The Hiperface encoder interface is a hybrid interface with an analog process data channel with SIN/COS track and a digital, bidirectional RS485 interface for serial transmission of the absolute position between an encoder and the evaluation electronics. The absolute value is created when the device is switched on and communicated to the drive controller through the RS485 interface.

Output signal (SIN/COS track)

Signal sequence depicted for clockwise turning of the motor shaft with direction of view toward the A bearing side of the shaft.

2,5 V

Technical data of the encoders
Data		U-encoder	V-encoder
Data		SEK 37	SEL 37
Voltage supply	VDC	7 - 12	7 - 12
Current consumption without load (8 V)	mA	50	50
Mechanically permitted speed	1/min	12000	12000
Analog signals (SIN/COS)
Analog resolution	Per./rotation	16	16
Signal level	V_SS	1 ±0.2	1 ±0.2
Offset	V	2.5 ±0.5	2.5 ±0.5
Absolute position values
Signal characteristic		RS485
Digital resolution	Pos./rotation	512 (9 Bit)	512 (9 Bit)
Rotations		1	4096 (12 Bit)

Note on startup

When switching on the power supply, or when doing a homing cycle, the encoder must not turn because the digital position is read twice and plausibility checked. If the difference between both read positions is out of the internal defined range, the diagnosis message info 1 = 7 is issued.