Magnescale RU74 User manual

RU74 / RU77
Installation Manual / Anbringungsanleitung / 安装说明书
Rotary Magnescale / Dreh-Magnescale / 磁栅旋转编码器
Read all the instructions in the manual carefully before use and strictly follow them.
Keep the manual for future references.
Lesen Sie die ganze Anleitung vor dem Betrieb aufmerksam durch und folgen Sie beim
Betrieb des Geräs den Anweisungen.
Bewahren Sie diese Anbringungsanleitung zum späeren Nachlesen gribereit auf.
感谢您惠购本产品。
使⽤之前请务必认真阅读本⼿册，并且严格按照⼿册中的规定操作。
将此⼿册留作以后的参考。

RU74 / RU77

RU74 / RU77
(E) (1)
Safety Precautions
Magnescale Co., Ltd. products are designed in full consideration of safety. However, improper
handling during operation or installation is dangerous and may lead to re, electric shock or other
accidents resulting in serious injury or death. In addition, these actions may also worsen machine
performance.
Therefore, be sure to observe the following safety precautions in order to prevent these types of ac-
cidents, and to read these “Safety Precautions” before operating, installing, maintaining, inspecting,
repairing or otherwise working on this unit.
Warning indication meanings
The following indications are used throughout this manual, and their contents should be under-
stood before reading the text.
Warning
Failure to observe these precautions may lead to re, electric shock or other accidents resulting in
serious injury or death.
Caution
Failure to observe these precautions may lead to electric shock or other accidents resulting in in-
jury or damage to surrounding objects.
Warning
•Do not use this unit with voltages other than the specied supply voltages as this may
result in re or electric shock.
•Do not perform installation work with wet hands as this may result in electric shock.
• Do not disassemble or modify the unit as this may result in injury or damage the internal
circuits.

(2) (E)
RU74 / RU77
General Precautions
When using Magnescale Co., Ltd. products, observe the following general precautions along with those given
specically in this manual to ensure proper use of the products.
• Before and during operations, be sure to check that our products function properly.
• Provide adequate safety measures to prevent damages in case our products should develop malfunctions.
• Use outside indicated specications or purposes and modication of our products will void any warranty of the functions
and performance as specied of our products.
• When using our products in combination with other equipment, the functions and performance as noted in this manual
may not be attained, depending upon operating environmental conditions. Make full study of the compatibility in ad-
vance.
Caution
• Be sure to check the machine and device conditions to ensure work safety before
working on the machine.
• Be sure to cut o the power supply and other sources of drive power before working on
the machine. Failure to do so may result in re or accidents.
• When turning on the power supply or other sources of drive power to operate the
machine, take care not to catch your ngers in peripheral machines and devices.

RU74 / RU77
(E) (3)
[For U.S.A. and Canada]
THIS CLASS A DIGITAL DEVICE COMPLIES WITH PART15
OF THE FCC RULES AND THE CANADIAN ICES-003.
OPERATION IS SUBJECT TO THE FOLLOWING TWO
CONDITIONS.
(1) THIS DEVICE MAY NOT CAUSE HARMFUL
INTERFERENCE, AND
(2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE
RECEIVED, INCLUDING INTERFERENCE THAT MAY
CAUSE UNDERSIGNED OPERATION.
CET APPAREIL NUMÉRIQUE DE LA CLASSE A
EST CONFORME À LA NORME NMB-003 DU CANADA.

(4) (E)
RU74 / RU77

(E) i
RU74 / RU77
Contents
1. Product Overview..................................................................... 1
1-1. Overview.....................................................................................................................1
1-2. Features.......................................................................................................................1
1-3. System Conguration ...............................................................................................1
1-3-1. RU74..........................................................................................................1
1-3-2. RU77 .........................................................................................................1
1-4. Accessories..................................................................................................................1
2. Output Signal ........................................................................... 2
2-1. Signal Specications..................................................................................................2
2-1-1. RU74..........................................................................................................2
2-1-2. RU77 .........................................................................................................3
3. Power Supply............................................................................ 4
4. Air Purge ................................................................................... 5
5. Rotary Magnescale Installation .............................................. 7
5-1. Installation Dimensions and Tolerance .................................................................7
5-2. Installation Precaution .............................................................................................7
5-3. Installation Preparation ...........................................................................................8
5-4. Installation Procedure ..............................................................................................9
6. Outside Dimensions............................................................... 10
7. Appendix .................................................................................11

ii (E)
RU74 / RU77

(E) 1
RU74 / RU77
1. Product Overview
1-1. Overview
is product is a compact, high-accuracy rotary magnescale that outputs position signals for machine
tools and other equipment requiring high-accuracy positioning.
1-2. Features
In addition to being a magnetic detection system, this product has a unit shape that enables easy installation
and provides superior environmental resistance from condensation and other eects.
Because of its extremely slim design (max. 42 mm), less space is taken up when installing in equipment.
1-3. System Conguration
1-3-1. RU74
RU74 has an interpolation circuit built into the rotary magnescale and is an A/B quadrature signal output
model.
e maximum response revolutions vary based on the minimum phase dierence time setting value of
the output signal.
A/B quadrature signal
Approx. 1°/1,000
Approx. 1°/1,0000
1-3-2. RU77
RU77 has an interpolation circuit built into the rotary magnescale and is a serial communication model,
compliant with absolute serial communication specications, that enables connection to a controller.
Number of divisions:
2 to the nth power divisions
(Serial communication)
1-4. Accessories
Hex. socket-head cap screws M4 × 16 4
Flat washers for M4 4
Installation Manual 1
Accuracy chart 1

2(E)
RU74 / RU77
2. Output Signal
2-1. Signal Specications
2-1-1. RU74
When the scale unit is viewed from above and the machine sha is rotated in the clockwise (CW) direction,
the A signal is ahead when the polarity is “positive” and the B signal is ahead when it is “negative.”
CW
When the polarity is “positive”
Asignal
Bsignal
Referencepoint
output signal
e scale revolution angle is detected every 50 ns, and the signal is output at a phase dierential time
proportional to the revolution angle.
e phase dierential time varies in integer multiples of 50 ns.
In the following cases, the A/B quadrature signal assumes high impedance.
e alarm is reset by turning the power o and then on again.
• When the phase dierential time of the A/B quadrature signal is less than the minimum phase
dierential time
• When noise or malfunctions occur
Response revolutions (min-1)
Resolution Minimum phase dierential time setting (ns)
50 100 150 200 250 300 400 500 650 1000
Approx. 1/1,000° 2000 1332 888 666 533 444 333 266 205 133
Approx. 1/10,000° 267 133 89 67

(E) 3
RU74 / RU77
Recommended Receiving Circuit
Use the type of dierential receiving circuit as shown in the gure below.
2-1-2. RU77
RU77 performs data communication with a controller using absolute serial communication protocol.
Communication Circuit Side
When connecting to a controller, be sure to follow the connection procedure of the controller manufacturer.
AOUT
BOUT
+5V
MC34C87or equivalent product
Twisted pair
cable
Twisted pair
cable
MC34C86or equivalent product
Z0
0.22 μF
250 V
SG
FG
SG
+5V
FG
Z0
Z0
Z0= 120 Ω
Scaleside
Z OUT
A
B
Z
Receiving side
CCW (addition direction)
CCW :Counter-clockwise

4(E)
RU74 / RU77
3. Power Supply
Use a power supply that satises the specications below.
Use of a power supply with a short-circuit protection device is recommended.
Item Power supply specications
Supply voltage DC 4.75 - 5.25 V
Consumption current 200 mA or less (for each axis)
Inrush current 2 A or less
(When the power supply rise time is 10 ms.)
Ripple voltage 50 mVp-p or less
Note
When using the rotary magnescale with an external power supply instead of with a controller
power supply
e rotary magnescale begins functioning normally approximatelly 0.6 seconds aer the power is turned
on.
Signal might come out momentarily when the power is turned on or o, and this signal can cause the
entire system to malfunction.
To prevent this, be sure to follow the proper power-on and power-o procedures. Also, use the procedures
below to turn the power o and on again if a malfunction occurs.
Power-on procedure
1. Turn on the power for the rotary magnescale.
2. Turn on the power for the receiving device.
Power-o procedure
1. Turn o the receiving device.
2. Turn o the rotary magnescale.

(E) 5
RU74 / RU77
4. Air Purge
Air can be injected into the scale unit to reduce the eects of the environments shown below.
e actual eects, however, will vary depending on operating conditions. erefore, be sure to fully check
the eects before using air purge.
• Use in dusty area
• Use in locations close to coolants
Air Tube Route and Device Conguration
Prepare the devices as shown in the gure below, and air is injected into the scale by connecting the air
tubes.
Plug (M5)
Tube bending radius R: 15mm or more
Polyurethane tube with outer diameter of
6mm and inner diameter of 4mm
Nylon tube with outer diameter of 8 mm
Air pressure source
Air lter (5 μmltration) Mist separator (0.3 μmltration)
Pressure reducing valve
Distributors
Scaleunit
Air nipple
e customer must obtain the air supply unit and input/output air tubes (IN side: φ8, OUT side: φ6, both
outer diameter).
Main components
Manufacturer Model Name Quantity
SMC Corporation AF40-A Air lter: 5 μm 1
SMC Corporation AFM40-A Mist separator: 0.3 μm 1
SMC Corporation AR3000-02G-1 Regulator with 200 kPa pressure gauge 1
SMC Corporation Y400T-A Spacer assembly with L-type bracket 1
SMC Corporation KQ2S06-M5 Air nipple 1
Note
e air lter and mist separator should incorporate a oat-type auto drain (NC) mechanism.
Use a drain tube with a diameter of at least 4 mm and length of 5 m or less. Set the tubes so that there is
no rising.

6(E)
RU74 / RU77
Tube Layout Notes
Tube arrangement
Use tubes with a bending radius of at least 15 mm and make sure that there are no sharp bends. Also, if the
tubes are laid parallel within the ducts for the electrical wiring or hydraulic tubes, be careful that the tubes
are not crushed by the movement of the ducts.
Tube length
To inject air simultaneously into multiple scales, make the tubes the same length from the distributor of
the air supply unit to each scale so that the injection air pressure is uniform for each scale.
Pressure setting and tube length for pressure reducing valve
If the air injection pressure for each scale is around 20 ±10 kPa, the air in the scale can be maintained at
a low humidity. However, setting the air injection pressure only via the pressure reducing valve will not
result in an air injection pressure of 20 ±10 kPa due to pressure losses stemming from the tube length.
Refer to graph below to determine the pressure setting of the pressure reducing valve.
Pressure reduction setting and tube length
Length of polyurethane tube with outer diameter of 6mm and inner diameter of 4mm
(kPa)
(m)
Pressure setting of pressure reducing valve
0
0
5
10
15
20
25
30
35
40
123 45678910
is graph illustrates the relationship between the regulator pressure setting and tube length when the air
injection pressure is 20 kPa. e tube length here is considered to be the length from the distributor of the
air supply unit to the scale.
Tube ushing
Flush the tube from the air pressure source to the air supply unit connectors and each scale connector.
Flushing cleans the tubes, prevents the embedding of foreign objects in the equipment, and is also useful
to check the tubes.

(E) 7
RU74 / RU77
5. Rotary Magnescale Installation
5-1. Installation Dimensions and Tolerance
Make preparations so that the rotary magnescale installation surface dimensions and tolerance have the
values shown in the gure below.
0.1 A
(M20 × 1)
ø100
ø85H7 ()
4rM4
3±0.1
5
+0.035
0
ø29+4
–
1
ø20g6
()
–
0.007
–
0.020
32 (12)
0 –1
A
0.01 A
ø0.1 A
0.02 A
Installation nut
(Obtained by the customer.)
Unit: mm
A
: Bearing rotation center
5-2. Installation Precaution
• If the surface of the rotary side or stationary side where the rotary magnescale will be installed has
paint or other coating, remove the paint or coating in order to obtain conductivity between the rotary
magnescale and the machine.
• Before installing the rotary magnescale, be sure to check that the dimensional tolerance of the installation
surface and machine sha are within the standards. If the installation dimensional tolerance is not
within the standards, the required accuracy will not be obtained, and the rotary magnescale can even
be damaged.
• In environments where coolant can splash directly on the rotary magnescale, be sure to mount a cover
on the rotary magnescale to protect the rotary magnescale from splashing.
• e installation nut and other installation tools must be obtained by the customer.
• e absolute position becomes 0 at the reference point mark ±2 degrees. Be sure to check its location
when securing the scale sha. (See section 6, “Outside Dimensions.”)
• In its standard conguration, the rotary magnescale has an M5 tap hole for air injection.

8(E)
RU74 / RU77
5-3. Installation Preparation
Transport plate is used to secure the scale unit and scale sha so that excess vibrations are not applied
to the scale sha during transportation. Before installing the rotary magnescale, be sure to remove the
transport plate.
+B3r5
+B6r35
Transport plate
Note
e transport plate does not set the installation standard for the rotary magnescale.
Perform the installation by following section 5-1, “Installation Dimensions and Tolerance.”

(E) 9
RU74 / RU77
5-4. Installation Procedure
1. Check that there is no dust or scratches on the rotary magnescale installation surface.
Check that there are no indentations, rust, or scratches on the machine sha where the rotary
magnescale will be installed. Completely wipe o any dust and dirt on the machine sha.
2. Insert the rotary magnescale gently into the machine sha.
e machine sha and scale sha are designed for a precise t, and so do not try to force insertion
of the rotary magnescale into the machine sha.
3. Secure the rotary magnescale.
Use M4 screws to install from the rotary magnescale top, and use M6 screws to install from the
rotary magnescale bottom. (M4 tightening torque: 2.5 N·m)
4. Use the installation nut to secure the scale sha to the machine sha.
(M20 × 1 tightening torque: 20 N·m)
e securing operation can be performed more smoothly by using a tightening wrench and
fastening wrench as shown in the “7. Appendix.”
M4 tap for installation
(4 locations)
Machine shaft
Rotary magnescaleunit
Installation nut
(See page 11.) M4 r16(included)
Flat washers (included)

10 (E)
RU74 / RU77
6. Outside Dimensions
ø5.6
ø18
ø30H6 ()
44 17
ø20H6 ()
ø85f7 ()
ø110
ø35
10º
92
ø100
33±0.1
3±0.05
10
30 40 42
+100
0
–0.036
–0.071
+0.013
–0
+0.013
–0
4rM6
(when
installing
from bottom)
Air injection hole(M5)
Referencemark
Cablelength 1000
4× M3, depth: 5
4rmounting holefor M4
(when installing from top)
4rø3.3±0.1,depth: 7
Unit: mm

(E) 11
RU74 / RU77
4rø2.8±0.1
4±1
8
ø25±0.1
M20 r1
ø29.6±0.1
2× C0.5
Unit: mm
7. Appendix
e following parts must be ob tained by the customer.
(Material: SUS303 or equivalent)
4× ø3parallel pin press tting or attachment
ø40±0.2 ø35±0.1
5±0.2
(6)
ø30+0.2
–
0
Unit: mm
ø29.6±0.2 ø20.4±0.1
ø25±0.1
3.5±0.2
(6) 8
4rø2.5 parallel pin press tting or attachment
4rM3 (for securing ring)
Ring
Arm
Unit: mm
Installation nut
Tightening wrench
Fastening wrench

12 (E)
RU74 / RU77