Yokogawa EJA530A - Manual (Page 56)

IM 01C21F01-01E 9-7
9. MAINTENANCE
Connect BRAIN TERMINAL and check self-diagnostics.
Does the self-diagnostic indicate problem location?
Contact Yokogawa service personnel.
F0907.EPS
Is power supply polarity correct?
Are valves opened or closed correctly?
Refer to error message summary in Subsection 8.5.2 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.
Refer to individual model user manuals and connect piping
as appropriate for the measurement purpose.
Fix pressure leaks, paying particular attention to connections
for impulse piping, pressure-detector section, etc.
Fully close equalizing valve, and fully open high pressure
and low pressure valves. NO
YES
YES
NO
YES
Adjust the zero point.
NO
YES
Is there any pressure leak?
Is impulse piping to high pressure
and low pressure side correct?
Is zero point adjusted correctly?
Output travels beyond 0% or 100%.
NO
Connect BRAIN TERMINAL and check self-diagnostics.
Contact Yokogawa service personnel.
F0908.EPS
Are valves opened or closed correctly?
Is impulse piping connected correctly?
Refer to error message summary in Subsection 8.5.2
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 9.2 when selecting instruments for calibration.
Fully close equalizing valve, and fully open high pressure
and low pressure valves.
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
NO
YES
NO
YES
NO
YES
YES
NO
NO
YES
NO
YES