
8.1 Installation Conditions for Linear Encoders
8.1.1 SGLG Servomotors
8-2
8.1
Installation Conditions for Linear Encoders
Observe the following installation conditions so that leakage flux from the Servomotor does not
cause the linear encoder to malfunction.
Refer to the specifications for each type of linear encoder for the installation conditions outside
a magnetic field.
Mounting location guidelines for the linear encoders are given below.
8.1.1
SGLG Servomotors
Manufacturer
Model
External Magnetic
Field Strength
Magnescale Co., Ltd.
SR75/77
5 mT max.
SR85/87
SL710/PL101
0.5 mT max.
SQ10
0.5 mT max.
SQ47/SQ57
5 mT max.
Mitutoyo Corporation
ST78
A
3 mT max.
If the linear encoder mounting materials or the Magnetic Way mounting materials are magnetic
materials, the magnetic field strength may exceed the specified values even for the following
installation conditions. Implement the following measures.
•
Use a nonmagnetic material for the structure (SUS, aluminum, etc.).
•
Install a magnetic material between the Magnetic Way and the linear encoder.
If implementing the above measures is not possible, install the linear encoder in a location where
the magnetic field strength is less than the specified value.
Note
Magnetic Way
Model
SGLGM-
Distance from Magnetic Way
X (mm)
+Y (mm)
-Y (mm)
Z (mm)
30
35
35
10
50
40
45
40
10
55
40
-M
65
60
10
75
60
65
55
10
75
60
-M
85
75
10
100
90
130
110
10
155
Z
Z
X
+Y
-Y