Yokogawa EJX530B - Manual (Page 68)

<9. Maintenance>
9-9
IM 01C27F01-01EN
9.5.2 Troubleshooting Flowcharts
Check display of the error code.
Check self-diagnostics by the device configuration tool.
Does the self-diagnostic
indicate problem location?
Contact Yokogawa service personnel.
F0907.ai
The following sorts of symptoms indicate that transmitter
may not be operating properly.
Example : • There is no output signal.
• Output signal does not change even though
process variable is known to be varying.
• Output value is inconsistent with value
inferred for process variable.
Fix pressure leaks, paying particular
attention to connections for impulse
piping,pressure-detector section, etc.
Fully open valve.
Are valves opened or
closed correctly?
Is there any pressure leak?
YES
NO
YES
NO
NO
YES
Refer to Alarm Message Summary in
Subsection 9.5.3.
Is the
Field Wireless Network
setting correct?
NO
YES Reconnect to the Field Wireless
Network.
Connect the device configuration tool and check self-diagnostics.
Does the self-
diagnostic indicate problem
location?
Contact Yokogawa service personnel.
F0908.ai
Are valves opened or
closed correctly?
Refer to Alarm Message Summary in
Subsection 9.5.3.
YES
NO
Fix pressure leaks, paying particular
attention to connections for impulse
piping, pressure-detector section, etc.
Fully open valve.
NO
YES
YES
NO
Adjust the zero point.
NO
YES
Is there any pressure leak?
Is zero point
adjusted correctly?
Output travels beyond 0% or 100%.