HEIDENHAIN MSB ERA 74xxC Modular Angle Encoder With Optical Scanning

Scale Tape

MSB ERA 7400 C full circle version

MSB ERA 7401 C segment version

Measuring standard

Grating period

Coefficient of expansion

Steel scale-tape with METALLUR graduation

40 µm

?therm ? 10.5 · 10–6 K–1

Signal periods1)

36 000

45 000

90 000

Accuracy of graduation2)

±3.9”

±3.2”

±1.6”

Interpolation error per signal period2)

±0.4”

±0.3”

±0.1”

Accuracy of the scale tape

±3 µm/m of tape length

Reference marks

Distance-coded

Scale-slot diameter*

Full circle

458.62 mm

573.20 mm

1146.10 mm

Segment

? 400 mm

Mech. permissible speed

? 250 rpm

? 250 rpm

? 220 rpm

Permissible axial movement

? 0.5 mm (scale tape relative to scanning head)

Permissible expansion coefficient of shaft

?therm?9 · 10–6 K–1 to 12 · 10–6 K–1

Protection EN 60 529

Complete encoder in mounted condition: IP00

Mass

? 30 g/m

* Please select when ordering, additional diameters up to max. 3 m upon request

1) Validity for full circle version; for segment versions depending on the mating diameter and the tape length

2) Accuracy of the graduation and interpolation error within one signal period result in the encoder-specific error; for additional error from mounting and bearing of the measured shaft, see Measuring accuracy