Technical data

The technical data presented here concerns typical values that apply within the specified limit values. It is possible to operate the encoder with differing parameters. Note that this may result in deviations from the specified transfer behavior of the signal tracks.

The encoder is approved for operation with encoder evaluation units and inverters from SEW-EURODRIVE.

The resolver can be operated on third-party inverters and controllers. Check the technical data for compatibility in this regard. If necessary, contact SEW‑EURODRIVE.

Encoder

Size, unit

RK8M

Motor series and size

 

DRN../DRU../DR2.63 – 355

Encoder type

 

Resolver

Excitation signal

Ref1 – Ref2

Pulse output

sin/cos, differential, amplitude-modulated

Signal tracks

US1-S3 US2-S4

cos = S1 – S3; sin = S2 – S4

Number of pole pairs

pR

1 = 2 poles

Direction of rotation

 

Cosine before sine when looking at the motor output shaft in clockwise rotation; see also functional description

Input voltage/excitation voltage

URef1-Ref2

7 Vrms (2 – 10 Vrms) = 19.8 Vpp (5.7 – 28.2 Vpp)

Input frequency/excitation frequency

fE

10 kHz (4 to 20 kHz)

Current consumption, free of load

 

60 mArms (≤ 100 mA) at 4 kHz

Encoder system accuracy, analog

 

±10'

Gear unit ratio/transformation ratio

TR

0.5 ±10%

Phase shift

 

0° ±5°

Residual voltage (offset voltage on signal tracks)

 

Max. 25 mVrms

Ref1 – Ref2 input impedance, open between Ref1 and Ref2

ZRO at fE = 10 kHz

120 Ω (70 + j95 Ω) ±15%

Ref1 – Ref2 input impedance, short circuit between S1 and S3 and between S2 and S4

ZRS at fE = 10 kHz

110 Ω (65 + j90 Ω) ±15%

S2 – S4 output impedance at position 0° minimum coupling, open between Ref1 and Ref2

ZSO at fE = 10 kHz

230 Ω (120 + j200 Ω) ±15%

S1 – S3 output impedance at position 0° maximum coupling, short circuit between Ref1 and Ref2

ZSS at fE = 10 kHz

305 Ω (150 + j270 Ω) ±15%

Ref1 – Ref2 input inductance, open between Ref1 and Ref2

LRO at fE = 10 kHz

1.5 mH ±20%

Ref1 – Ref2 input inductance, short circuit between S1 and S3 and between S2 and S4

LRS at fE = 10 kHz

1.4 mH ±20%

S2 – S4 output inductance at position 0° minimum coupling, open between Ref1 and Ref2

LSO at fE = 10 kHz

3.1 mH ±20%

S1 – S3 output inductance at position 0° maximum coupling, short circuit between Ref1 and Ref2

LSS at fE = 10 kHz

4.3 mH ±20%

DC resistance of the input

RRef1-Ref2

36 Ω ±10%

DC resistance of the output

RS1-S3
RS2-S4

62 Ω ±10%

Temperature coefficient

 

0.39%/K

Connection

  • M23 signal connector on the terminal box (optionally with or without temperature sensor)
  • Terminal strip in the terminal box (optionally with or without temperature sensor)
  • M23 with 0.36 m cable directly on the encoder (without temperature sensor)
  • Integrated encoder connector on the fan guard side (can be preassembled and plugged in the field); optionally with M23 connector; without temperature sensor
  • Integrated encoder connector at the rear of the fan guard (can be preassembled and plugged in the field); optionally with M23 connector; without temperature sensorNote that the permissible ambient temperature of the motor is limited with this connection variant. Contact SEW‑EURODRIVE with regard to this.

Shaft load

 

Max. ≤ 30 N axial; max. ≤ 40 N radial

Degree of protection according to EN 60529

IP66

Corrosion protection, surface protection for motor

KS, OS1 – OS4, OSG

Corrosion protection for encoder

 

IEC 60068-2-52 salt spray according to C5 (C5-I) as per ISO 12944-2

Installation altitude

h

≤ 4000 m above sea level

Maximum speed

nmax

6000 min-1

Maximum mechanical speed

nmax

6000 min-1

Vibration resistance in accordance with EN 60068‑2‑6

 

10g = 98.1 m/s²

Shock resistance in accordance with EN 60068‑2‑27

 

100g = 981 m/s²

Maximum angular acceleration

 

≤ 2 × 104 rad/s2

Maximum degree of pollution during installation work

Degree of pollution 1 (IEC 61010-1, EN 60664-1, VDE 0110-1)

Ambient temperature of motor

DRN../DR2./DRU.63 – 355

°C

-30 to +60

DR2C..: -30 to +60

Ambient temperature of encoder

°C

-30 to +85

Storage temperature of encoder

°C

-15 to +70 (dry, dust-free, protected against sun)

Maximum cable length

 

100 m

Explosion protection mark ATEX/IECEx

 

IECEx certificate of conformity

 

Electronic nameplate

Functional safety