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About This Manual
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Before operating the Megatorque Motor System, this manual should be read thoroughly. The
Megatorque Motor System is a unique device, so ‘common sense’ based upon experience with
servo motor may not apply here. Careful consideration of the mechanical design as described in
“Chapter 6” is especially important.
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This manual describes the interface, function and operation of the Megatorque Motor System. This
manual provides information on the ESA25 Driver Unit. If your model is not ESA25, contact NSK
for respective information.
Technical Information
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For technical assistance and sales information, please contact your local NSK office. A list of NSK
offices is provided in the back cover.
Megatorque Motor System
Conformity to EC Directives (CE Marking)
NSK Ltd. declares that “Megatorque Motor System” conforms to EC Directive (CE Marking).
However, please note that the following conditions are added for conformity to the EC Directives.
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EC Declaration of Incorporation
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Megatorque Motor System is a machine component that is to be incorporated into the machine. (EC
Declaration of Incorporation)
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The Megatorque Motor System must not be operated until it is incorporated into the machine.
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The Megatorque Motor System conforms to the following EC Directives as a machine component.
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EC Machinery Directive 89/392 as amended 94/368 and 93/44.
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EC Low Voltage Directive 73/23 as amended 93/68.
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The users have to take appropriate measures to their machines to conform to Electoromagnetic
Compatibility Directive. The Megatorque Motor System must not be put into service until the
machinery into which is to be incorporated has been declared in conformity with the provisions of
the EC Directives.
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Our declaration becomes invalid if technical or operational modifications are introduced to the
products without the consent of NSK Ltd.
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Remaining Hazards
(Following notes should be observed for your safety.)
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The Driver Unit must be used in the environmental condition of the Installation Category I and
Pollution Degree 2. The Motor and the Driver Unit must be ground respectively.
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An isolation transformer must be used to prevent electrical shock. The isolation transformer shall
have enough capacity for power consumption of the Megatorque Motor System.
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Install a noise filter in the primary AC power line as a measure against external noise.
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A thermal protection circuit for the Motor must be provided by the user to prevent the Motor from
overheating.
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A circuit breaker must be installed into the primary AC power line of the Megatorque Motor
System.
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The cables that connect the Motor and Driver Unit should be used only for internal wiring. Proper
protection of the cables is obligated depending on the usage.
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