EAR70
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax:
+81(6)6659-8510 E-mail: [email protected]
EM-4885 P. 2 / 8
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ANTINOISE ELECTRICAL CONNECTION
• Lightning surge protection
In order to protect the unit from lightning surges enter-
ing through cables, use of appropriate lightning surge
protectors are recommended. Installing a noise filter
enables protection from various electrical stresses.
• Ground the earth screw. If the unit is installed in the
environment without earthing, it may cause a malfunc-
tion or failure.
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DESIGNING JOINT AND YOKE
• Operate this unit within specified voltage and frequency.
The rated output torque is 70 N
·
m. Do not operate this
unit within the condition that the output stem is locked.
(The valve stem is locked or more than 120 N
·
m torque
is necessary.) Design the connected stem so that it is not
sheared. Observe enough strength when designing the
yoke so that there is no bending and distortion.
• Prevent from heat conduction and radiation when con-
necting surface is high temperature or its radiated heat
is high. If the temperature of the unit rises by a heat con-
ducted or radiated from external, it may cause a failure.
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ENVIRONMENT
• The unit does not endure all vibration at installation site.
Even if that is low vibration, the unit cannot be guaran-
teed over a long period. Please use after evaluation with
customer’s installation environment. (Particularly avoid
using at the place where there is water hammer, steam
hammer or cavitation on the valve side.)
• The actuator must be installed in a place where mainte-
nance and inspection can be conducted. Leave spaces of
at least 20 cm (7.9 in.) for maintenance and inspection
above the unit and around its terminal cover.
• DO NOT use in hazardous atmosphere such like explosive
gases, corrosive gases, corrosive liquids or salt pollution.
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OPERATING CONDITION
• Depending on operating condition, the internal tempera-
ture may rise extremely high.
• Operating continuously under such conditions results in
short life span or damage of the product and may impair
expected performance.
• Operate with an enough margin such as shortening the
operational duty time ratio (duty ratio of <50% or less
than 13 strokes per minute).
