Yokogawa EJA438 - Manual (Page 52)

IM 1C22J1-01E 8-6
8. MAINTENANCE
Connect BRAIN TERMINAL and check self-diagnostics.
Does the self-
diagnostic indicate problem
location?
Contact Yokogawa service personnel.
F0806.EPS
Is power supply
polarity correct?
Is the
diaphragm seal correctly
connected to the
process?
Refer to error message summary in
Subsection 7.5.2 to take actions.
YES
NO
NO
YES Check/correct polarity at each terminal
from power supply to the terminal box.
Use the transmitter within the
measurement range shown on the
data plate.
Correct the connections.
NO
YES
YES
Adjust the zero point.
NO
NO
YES
Is the pressure as specified?
Is zero point
adjusted correctly?
Output travels beyond 0% or 100%.
Connect BRAIN TERMINAL and check self-diagnostics.
Contact Yokogawa service personnel.
F0807.EPS
Are power
supply voltage and load
resistance correct?
Is external noise
contained in the outout?
Refer to error message summary in
Subsection 7.5.2 to take actions.
Provide lagging and/or heat insulation,
or allow adequate ventilation.
Refer to Section 8.2 when selecting
instruments for calibration.
Refer to Section 5.6 to obtain the rated
voltage and load resistance.
Avoid noise by providing complete
grounding, or using shielded wires.
Adjust the output.
Is output adjusted correctly?
Large output error.
Does the self-
diagnostic indicate the problem
location?
Is transmitter
installed where there is
marked variation in
temperature?
Is excess capillary secured?
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Secure it so that it is not moved by
wind or vibration.
Were appropriate
instruments used for
calibration?
YES
NO