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Absolute, high-resolution position acquisition for rotative applications
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The MSAC501 magnetic sensor serves truly absolute roto measurement, e.g., on large 3-phase current or torque motors.The sensor has the standardized SSI or 485 interfaces. Optionally, an LD output can be selected for incremental signal output. Circumferential speeds of 25 m/sec (incremental) or 5 m/sec (absolute) can be attained.

Profile MSAC501:
Max. resolution 0.0014° (MRAC501) or 4.88 µm
Repeat accuracy of 0.0014° (MRAC501) or 4.88 µm
System accuracy ±0.06° (MRAC501) or ±0.03 mm
SSI output circuit, RS485 (absolute), optional LD (incremental)
Signal period 5 mm
Status LEDs for diagnosis

Mechanical data

Feature Technical data Additional information
Housing zinc die-cast  
Sensor/ring reading distance ≤0.2 mm  

Electrical data

Feature Technical data Additional information
Operating voltage 4.5 … 30 V DC  
Power input <1.5 W  
SSI clock speed input ≤750 kHz

depending on cable length

Output circuit

without, LD (RS422)

 
Interface

SSI, RS485

 
Cycle time ≤30 µs  
Type of connection M12 plug connector (A-coded) 12-pole, 1x pin

System data

Feature Technical data Additional information
Pole length 5 mm  
Resolution 4.88 µm  
  0.0014° at MRAC501-256 pole
Scaling factor 7, 8, 9, 10 bit absolute
  7, 8, 9, 10 bit incremental
System accuracy ±0.06°

at TU = 20 °C

  ±0.03 mm

at TU = 20 °C

Repeat accuracy ±0.0014°

at TU = 20 °C

  ±0.005 mm

at TU = 20 °C

Measuring range 360° single-turn
Circumferential speed ≤5 m/s absolute

Circumferential speed, incremental

    Circumferential speed [m/s]
Incremental scaling 7 Bit 25.00 15.63 7.81 3.13 1.95 0.98 0.49 0.24 0.12
8 Bit 19.53 7.81 3.91 1.56 0.98 0.49 0.24 0.12 0.06
9 Bit 9.77 3.91 1.95 0.78 0.49 0.24 0.12 0.06 0.03
10 Bit 4.88 1.95 0.98 0.39 0.24 0.12 0.06 0.03 0.01
Pulse interval [μs] 0.2 0.5 1 2.5 4 8 16 32 66
Counting frequency [kHz] 1250 500 250 100 62.5 31.25 15.63 7.81 3.79

Ambient conditions

Feature Technical data Additional information
Ambient temperature -30 … 85 °C  
Storage temperature -40 … 85 °C  
Relative humidity 100 % condensation admissible
EMC EN 61000-6-2 interference resistance / immission
 

EN 61000-6-4

emitted interference / emission

Protection category IP67 EN 60529, mating connector mounted
Shock resistance 500 m/s2, 11 ms

EN 60068-2-27

Vibration resistance 100 m/s2, 5 … 150 Hz

EN 60068-2-6

Ordering table

HintWhen ordering the system components please take care that the same code size is used

Feature Order data Specifications Additional information
Code size

A7

7 bits  

8

8 Bit  

9

9 Bit  

10

10 bits  

11

11 bits  
 
absolute scaling

B7

7 bit  

8

8 bit  

9

9 bit  

10

10 bit  
 
Interface

CRS485

SIKONETZ3  

SSI

SSI  
 
Output circuit

DO

without  

LD

LineDriver  
 
incremental scaling

E7

7 Bit only with LD

8

8 Bit only with LD

9

9 Bit only with LD

10

10 Bit only with LD
 
Pulse interval

F...

0.2, 0.5, 1.0, 2.5, 4.0, 8.0, 16.0, 32.0, 66.0 in µs only with LD
 

Ordering key

MSAC501-A-B-C-D-E-F-S

For more information, click here!

Pin assignment

Without LD

SSI RS485 PIN
nc nc 1
D+ DÜA 2
D- DÜB 3
T- nc 4
+UB +UB 5
nc nc 6
nc nc 7
nc nc 8
nc nc 9
config config 10
T+ nc 11
GND GND 12

With LD

SSI RS485 PIN
nc nc 1
D+ DÜA 2
D- DÜB 3
T- nc 4
+UB +UB 5
/A /A 6
A A 7
/B /B 8
B B 9
config config 10
T+ nc 11
GND GND 12

Hint for mounting

When mounting sensor and magnetic ring, please be careful to align both system components correctly.

A, Sensor/ring reading distance
     (active measurement area)
≤0.2 mm
B, Lateral offset ±1.5 mm
C, Alignment error <±0.5°

HintFurther assembly instructions for the MSAC501 magnetic sensor can be found in the MBAC501 magnetic band data sheet

MSAC501 Hint for mounting
Symbolic sensor representation

Scope of delivery

  • distance gage
  • Mounting instructions
  • MSAC501