Replacing The Fan Unit; Purpose Of Attaching The Fan Unit; Fan Unit Replacement Period; Fan Unit Used For Replacement - Omron NX-PA Series User Manual

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Replacing the Fan Unit

This section describes how to replace the Fan Unit, a part of the NX7-series CPU Unit that allows
replacement as preventive maintenance.
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Purpose of Attaching the Fan Unit

A CPU that is incorporated in an NX7-series CPU Unit requires forced cooling to maintain its perfor-
mance. A Fan Unit is used to cool the CPU.
If the Fan Unit is not mounted, or if rotation of the fan stops or the rotation speed decreases due to a
failure or other causes, a Slow Fan error occurs in the Controller. If you continue the operation without
taking measures, a CPU Unit Overheat error (a minor fault level Controller error) or a CPU Unit Over-
heat (Operation Stopped) error may occur. The latter will stop operation of the Controller.
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Fan Unit Replacement Period

The Fan Unit has a high resistance to wear and a long service life that corresponds to the life of an
NX7-series CPU Unit. However, an accidental failure may be caused by entry of foreign particles or
other factors.
The NX7-series CPU Units employ a replaceable Fan Unit that allows preventative maintenance.
You need to replace the Fan Unit if the Fan Unit stops or a Slow Fan error occurs and operation is not
recovered after you remove the obstacle from the Fan Unit.
When you replace the Fan Unit, stop the operation and turn OFF the power supply to the Controller.
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Fan Unit Used for Replacement

Use an NX-FAN01 Fan Unit.
The service life of a Fan Unit is 10 years at the ambient temperature of 55°C, and the storage limitation
for a Fan Unit that is not energized is 1 year.
Select a Fan Unit which was manufactured less than 10 years ago and has been stored for less than a
year without being energized. Perform operation check for the Fan Unit before you use it in normal
operation.
Precautions for Correct Use
• Do not use a Fan Unit which was subject to a strong impact, such as dropping on the floor. A
damaged bearing may cause a failure.
• Perform periodic cleaning procedures and remove dust from the Fan Unit. The service life of
the Fan Unit may be reduced due to dust.
NX-series CPU Unit Hardware User's Manual (W535)
6 Inspection and Maintenance
6
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