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Scanning head

AK ERA 4280 graduation period 20 µm

AK ERA 4480 graduation period 40 µm

AK ERA 4880 graduation period 80 µm

Interface

1 VPP

Cutoff frequency –3 dB

≥ 350 kHz

Electrical connection

Cable 1 m, with M23 coupling (12-pin)

Cable length

≤ 150 m (with HEIDENHAIN cable)

Voltage supply

5 V DC ± 0.5 V

Current requirement

< 100 mA (without load)

Vibration 55 to 2 000 Hz

Shock 6 ms

≤ 200 m/s2 (EN 60 068-2-6)
≤ 1 000 m/s2 (EN 60 068-2-27)

Operating temperature

-10 °C to 80 °C

Weight (approx.) Scanning head

20 g; Scanning head for protective cover: 35 g (each without cable)

Scale drum

TTR ERA 4200 C graduation period 20 µm

TTR ERA 4400 C graduation period 40 µm

TTR ERA 4800 C graduation period 80 µm

Measuring standard

Expansion factor

Steel drum

αtherm ≈ 10.5 · 10-6 K-1

Signal periods/Position error per signal period1)

ERA 4200

12 000/± 1.1”

16 384/± 0.8”

20 000/± 0.7”

28 000/± 0.5”

32 768/± 0.4”

40 000/± 0.4”

52 000/± 0.3”

ERA 4400

6 000/± 2.2”

8 192/± 1.6”

10 000/± 1.3”

14 000/± 1.0”

16 384/± 0.8”

20 000/± 0.7”

26 000/± 0.5”

38 000/± 0.4”

44 000/± 0.3”

ERA 4800

3 000/± 4.4”

4 096/± 3.2”

5 000/± 2.6”

7 000/± 1.9”

8 192/± 1.6”

10 000/± 1.3”

13 000/± 1.0”

Accuracy of graduation

± 5”

± 3.7”

± 3”

± 2.5”

± 2”

Reference marks

Distance-coded, one upon request

Drum inside diameter*

40 mm

70 mm

80 mm

120 mm

150 mm

180 mm

270 mm

425 mm

512 mm

Drum outside diameter*

76.75 mm

104.63 mm

127.64 mm

178.55 mm

208.89 mm

254.93 mm

331.31 mm

484.07 mm

560.46 mm

Mechanically permissible speed

10 000 min-1

8 500 min-1

6 250 min-1

4 500 min-1

4 250 min-1

3 250 min-1

2 500 min-1

1 800 min-1

1 500 min-1

Moment of inertia of rotor

0.27 · 10-3 kgm2

0.81 · 10-3 kgm2

1.9 · 10-3 kgm2

7.1 · 10-3 kgm2

12 · 10-3 kgm2

28 · 10-3 kgm2

59 · 10-3 kgm2

195 · 10-3 kgm2

258 · 10-3 kgm2

Permissible axial movement

≤ ± 0.5 mm (scale drum relative to scanning head)

Protection* EN 60 529

Without protective cover

IP 00

With protective cover2) and compressed air

IP 40

IP 40

IP 40

IP 40

IP 40

IP 40

IP 40

Weight (approx.)

Scale drum

0.28 kg

0.41 kg

0.68 kg

1.2 kg

1.5 kg

2.3 kg

2.6 kg

3.8 kg

3.6 kg

Protective cover

0.07 kg

0.1 kg

0.12 kg

0.17 kg

0.28 kg

0.26 kg

0.35 kg

* Please select when ordering

1) The position error within one signal period and the accuracy of the graduation result together in the encoder-specific error; for additional error through mounting and the bearing of the measured shaft, see Measuring accuracy

2) Only with ERA 4480; the protective cover must be ordered separately