I-encoder

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

Encoder type	Technical description	Manufacturer / designation

Analog encoder ( )
Homing pulse ( )

Heidenhain

ERN 1380

ERN 1381

Resolution: 512 / 1000 / 1024 / 2048 periods/revolution

Measuring principle: optical ( )

Principle

If an analog encoder has several SIN/COS periods per rotation, an absolute position reference within a motor rotation is possible. The rotor rotating field of the permanent magnets of a synchronous motor is not aligned on the stator rotating field. For synchronous motors with I encoder, alignment takes place automatically in the drive controller through the software commutation function after each power on and initial setting of the controller enable.

Output signals

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
2,5 V

The encoders are temperature-compensated and deliver standardized output signals.

Technical data of the encoders
Data		I-encoder
Data		ERN 1380 ERN 1381
Sine-shaped voltage signals
Signal level	V_SS	1 ±0.2
Offset	V	2.5 ±0.5
Resolution	Per./rotation	512 / 1024 / 2048
Symmetry deviation		≤0.065
Signal ratio		0.8 - 1.25
Phase angle	° el.	90 ±10
Homing signal
Effective fraction	V	≥0.2
Resting value	V	≤1.7
Signal-to-noise ratio	V	0.04 - 0.68

Output circuit