Yokogawa Electric Corporation - TC10 - ENGINEERING MANUAL - PAG. 24
7.4.5 The display colour shows the Deviation
This instrument allows to program the deviation (PV - SP) for
colour display change (see parameter [124] AdE).
In this way the upper display will be:
–
Amber when PV is lower than SP - AdE.
–
Green when (SP - AdE) < PV<SP + AdE)
–
Red when PV is higher than SP+AdE
7.5 MANUAL MODE
This operative mode allows you to deactivate automatic
control and manually program the percentage power output
to the process.
When the instrument is in manual mode, the upper display
will show the measured value while the lower display will
show alternately the power output [preceded by
H
(for
heating action) or
C
(for cooling action)] and the message
oPLo
(open loop).
When manual control is selected, the instrument will start to
operate with the same power output as the last one supplied
by automatic mode and can be modified using the
and
buttons.
In case of ON/OFF control, 0% corresponds to the
deactivated output while any value different from 0
corresponds to the activated output.
As in the case of visualization, the programmable values
range from H100 (100% output power with reverse action) to
C100 (100% output power with direct action).
Notes: 1.
During manual mode, the alarms are operative.
2.
If you set manual modes during self-tune
execution, the self- tune function will be aborted.
3.
During manual mode, all functions not related
with the control (wattmeter, independent timer,
“worked time”, etc) continue to operate normally.
7.6 STAND BY MODE
This operative mode also deactivates the automatic control
but forces the control output to zero.
In this mode the instrument operates as an indicator.
When the instrument is in stand by mode the upper display
will show the measured value while the lower display will
show alternately the set point and the message “St.bY”.
Notes: 1.
During stand by mode, the relative alarms are
disabled while the absolute alarms are operative
or not according to the ALxo (Alarm x enabling
during Stand-by mode) parameter setting.
2.
If you set stand by mode during program
execution, the program will be aborted.
3.
If you set stand by mode during self-tune
execution, the self- tune function will be aborted.
4.
During stand by mode, all functions not related
with the control (wattmeter, independent timer,
“worked time”, etc) continue to operate normally.
5.
When the instrument is swapped from stand
by to auto modes, the instrument will start
automatically the alarm masking, the soft start
functions and the auto-tune (if programmed).
8. ERROR MESSAGES
8.1 OUT OF RANGE SIGNALS
The upper display shows the OVER-RANGE and UNDER-
RANGE conditions with the following indications:
Over-range
Under-range
The sensor break will be signalled as an out of range
Note:
When an over-range or an under-range is detected,
the alarms operate as in presence of the maximum or
the minimum measurable value respectively.
To check the out of span Error condition, proceed as follows:
1.
Check the input signal source and the connecting line.
2.
Make sure that the input signal is in accordance with the
instrument configuration.
Otherwise, modify the input configuration (see section 4).
3.
If no error is detected, send the instrument to your
supplier to be checked.
8.2 LIST OF POSSIBLE ERRORS
ErAT
Fast Auto-tune cannot start. The measure value is too
close to the set point.
Push the
button in order to delete the error message.
ouLd
Overload on the out 4
The messages shows that a short circuit is present on
the Out 4 when it is used as output or as a transmitter
power suply.
When the short circuit disappears the output restart to
operate.
NoAt
Auto-tune not finished within 12 hours.
ErEP
Possible problem of the instrument memory.
The messages disappears automatically.
When the error continues, send the instrument to your
supplier.
RonE
Possible problem of the firmware memory.
When this error is detected, send the instrument to
your supplier.
Errt
Possible problem of the calibration memory.
When this error is detected, send the instrument to
your supplier.
