Yokogawa YTA320 - Manual (Page 33)

<6. Maintenance>
6-5
IM 01C50B01-01E
Table 6.3 Problems, Causes and Countermeasures
Observed
Problems
Possible Cause Countermeasure
Related Parameter
(BRAIN protocol) (HART protocol)
Output fluctuates
greatly.
Span is too narrow. Check the range, and
change the settings to make
the span larger.
F10:LRV
F20:URV
PV LRV (4)
PV URV (5)
Input adjustment by
user was not corrctly
done.
Clear the user adjustment
(Sensor trim) value or set it
to off.
J05:SNSR1 CLR
K05:SNSR2 CLR
Snsr1 Trim Act
(123312)
Snsr2 Trim Act
(123322)
Output adjustment by
user was not correctly
done.
Clear the user adjustment
(output trim) value or set it
to off.
L05:OUT CLR D/A Clr to Default
(12343)
Transmitter
outputs fixed
current.
The transmitter is in
manual (test output)
mode.
Release manual mode.
(Make the transmitter return
to Automatic Mode)
G10:OUTPUT MODE Loop test (122)
Input adjustment by
user was not corrctly
done.
Clear the user adjustment
(Sensor trim) value or set it
to off.
J05:SNSR1 CLR
K05:SNSR2 CLR
Snsr1 Trim Act
(123312)
Snsr2 Trim Act
(123322)
Output adjustment by
user was not correctly
done.
Clear the user adjustment
(output trim) value or set it
to off.
L05:OUT CLR D/A Clr to Default
(12343)
Output is reversed.
(See note 1)
LRV is greater than
URV.
Set the correct value to URV
and LRV.
F10:LRV
F20:URV
PV LRV (4)
PV URV (5)
The transmitter is set to
reversed output mode.
Set the transmitter to normal
output mode.
H10:REVERSE OUT —
Parameters cannot
be changed.
The transmitter is in
write protect status.
Release write protect. H40:WRITE PROTCT Chng wrt Protect
(Hot key)
Sensor backup
function doesn’t
work correctly.
Settings of Process
Variables are not
correct.
Set Sensor1 as PV and
Sensor2 as SV.
B10:PV is
B20:SV is
PV is (11211)
SV is (11212)
Configuration of
Sensor1 and Sensor2 is
not correct.
• Check the type and wire
settings for Sensor1 and
Sensor2.
• Check the connection of
Sensor1 and Sensor2.
D10:SENSOR1 TYPE
E10:SENSOR2 TYPE
Snsr1 config (134)
Snsr2 config (135)
Sensor Burnout is set
to “off.”
Check the Sensor Burnout
setting.
F40:BURN OUT Sensor barnout
(14315)
Sensor backup mode is
not enabled.
Change the Sensor Backup
function to “enable.”
H20:SNSR BACKUP Snsr backup (14141)
Output damping
doesn’t work.
Damping time constant
is set to “0 second.”
Set correct value. B12:PV DAMPING PV damp (1322)
Setting for “PV damping
point” is too small.
If output fluctuation is great,
set a greater value for PV
damping point than current
setting. (Initial setting is “2%”
of output)
B13:DMP POINT PV damp point
(1323)
Note 1: If the reversed output is desired and necessary setting was done by user, it is not considered as a problem.