IM 01C25C01-01E
8-6
8. MAINTENANCE
Connect BRAIN TERMINAL and check self-diagnostics.
Does the self-
diagnostic indicate problem
location?
Contact Yokogawa service personnel.
F0807.EPS
Is power supply
polarity correct?
Are valves opened or
closed correctly?
Refer to error message summary in each
communication manual to take actions.
YES
NO
NO
YES
Refer to Section 6.3 to check/correct
polarity at each terminal from power
supply to the terminal box.
Fix pressure leaks, paying particular
attention to connections for impulse
piping, pressure-detector section, etc.
Fully open the low pressure 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%.
Connect BRAIN TERMINAL and check self-diagnostics.
Contact Yokogawa service personnel.
F0808.EPS
Are valves opened or
closed correctly?
Is impulse piping
connected correctly?
Refer to error message summary in each
communication manual to take actions.
Refer to Section 6.6 for rated voltage
and load resistance.
Provide lagging and/or cooling, or allow
adequate ventilation.
Refer to Section 8.2 when selecting
instruments for calibration.
Fully open the low pressure valve.
Refer to individual model user manuals
and connect piping as appropriate for
the measurement purpose.
Adjust the output.
Is transmitter
installed where there is
marked variation in
temperature?
Is output adjusted correctly?
Large output error.
Does the self-
diagnostic indicate problem
location?
Are power supply
voltage and load resistance
correct?
Were appropriate
instruments used for
calibration?
YES
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
