Omron NX701-1700 User Manual page 178

5 Troubleshooting
Event name CPU Unit Overheat
Meaning The temperature inside the CPU Unit exceeded the specified value.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
_SelfTest_HighTemperature
Cause and Assumed cause
correction
The ambient operating temperature is
too high.
Attached None
information
Precautions/ None
Remarks
Event name Slow Fan
Meaning The speed of the fan dropped to a specified level or lower.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
_SelfTest_LowFanRevolution
Cause and Assumed cause
correction
Something is interfering with fan oper-
ation, such as dust, wire scraps, or
cuttings.
The fan has reached the end of its
service life.
The fan is faulty.
Attached None
information
Precautions/ You can change the event level to the observation level. If you change the level to the observation level, recovery pro-
Remarks cedures are not required.
* Refer to 6-3 Replacing the Fan Unit for the Fan Unit replacement procedure and life.
5 - 42
Source details
Minor fault Recovery
Continues. Operation
Data type
BOOL
Correction
Make sure that the ambient operating
temperature stays between 0 and
55°C.
• Provide enough space for good air
flow.
• Do not install the Controller above
equipment that generates a large
amount of heat, such as heaters,
transformers, or high-capacity
resistors.
• If the ambient temperature exceeds
55°C, install a cooling fan or air
conditioner.
Source details
Minor fault Recovery
Continues. Operation
Data type
BOOL
Correction
Remove the material that is interfer-
ing with fan operation.
Replace the Fan Unit.*
Event code 000C0000 hex
None Detection
timing
Cycle the power Log category
supply or reset
the Controller.
Not affected.
Name
CPU Unit High Temperature Flag
Prevention
Make sure that the ambient tempera-
ture stays between 0 and 55°C.
Event code 00120000 hex
None Detection
timing
Error reset Log category
Operation is not affected.
Name
Low Fan Revolution Flag
Prevention
Make sure that nothing is interfering
with the fan during operation.
Regularly replace the Fan Unit.*
NX-series CPU Unit Hardware User's Manual (W535)
Continuously
System
Continuously
System