Yaskawa Sigma-5 User Manual: Setup for Linear Motors - Manual (Page 50)

2 Installation
2.3.1 Installation Conditions
2-28
2.3
Linear Scale Installation and Adjustment
2.3.1 Installation Conditions
The magnetic flux leaked from a linear servomotor may lead to malfunction of the
linear scale. To avoid such malfunction, determine the linear scale installation loca-
tion in such environment that the magnetic field strength on the linear scale mounted
surface satisfy the following condition.
For the environmental conditions other than magnetic field, refer to the specifications
of the corresponding linear scale.
The guideline for installation position of each linear servomotor in relation to the
linear scale is shown in the following pages.
When the linear scale mounting material and/or the linear servomotor magnetic way
mounting material are magnetic, installing the linear servomotor on the position
described on the following pages may not satisfy the condition of magnetic field
strength. Use non-magnetic material such as stainless steel and aluminium for the
mounting body, or provide magnetic shielding structure such as magnetic separator
between the linear servomotor magnetic way and the linear scale, and install the
linear scale on the position described in the following pages.
If your machine configuration does not allow the installation of the linear servomotor
and the linear scale such way as described on the following pages, measure the
magnetic field strength on the position where the linear scale is actually installed, and
take a counter measure for the magnetic field strength not to exceed the value
specified in the above table.
Manufacturer Model
External Magnetic Field
Strength
Magnescale Co., Ltd.
SR75/77
5 [mT] max.
SR85/87
SL710/PL101 0.5 [mT] max.
Mitutoyo Corporation ST78A 3 [mT] max.