YOKOGAWA UT Advanced UT32A, User Manual

Page: 238 / 340

16-1
IM 05P01D31-01EN
Troubleshooting,
Maintenance,
and
Inspections
16
16.1 Troubleshooting
16.1.1 Troubleshooting Flowchart
If the Operation Display does not appear after turning on the controller’s power, follow
the measures in the procedure below.
If a problem appears complicated, contact our sales representative.
Is the controller
defective?
Contact us for repair. Problem solved.
No communication
capability
Completely
inactive?
Yes
Yes
Yes
No
No
No
Key
operation
failure?
Yes
No
Yes
Check wiring on the
power terminals.
Check the key lock
setting.
Display
failure?
*
Yes
No
Turn off power, and
then turn it on again.
I/O signal
failure?
Yes
No
Check the I/O specifications
of the controller.
Check the
supply voltage.
Check the
specifications and polarity
of connected devices.
Check the communication-
related parameters.
Check the specifications
of communication
devices.
Check the
communication wiring.
Communication
failure?
No
With
communi-
cation?
Yes
Normal?
Is the
key locked?
Check the specifications
of the controller.
Yes
No
Correct?
Correct the error(s).
Cancel the setting.
*: The LCD (a liquid crystal display) is used for a display portion of this product. The LCD has
a characteristic that the display action becomes late at the low temperature. Additionally,
the luminance and contrast degradation are caused due to aged deterioration. However, the
control function is not affected.
Chapter 16 Troubleshooting, Maintenance, and Inspections