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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 T_U = 20 °C
	±0.03 mm	at T_U = 20 °C
Repeat accuracy	±0.0014°	at T_U = 20 °C
	±0.005 mm	at T_U = 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

When 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
Pulse interval

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°

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

Symbolic sensor representation

Scope of delivery

distance gage
Mounting instructions
MSAC501

Siko Magnetic sensor MSAC501

sku SIK-MSAC501

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