Ascon Tecnologic - KX6 - ENGINEERING MANUAL -
PAG. 20
8.4.5 The display colour shows the Deviation
This instrument allows to program the deviation (PV - SP) for
colour display change (see parameter [78] 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.
8.5 Manual mode
This operative mode allows you to deactivate automatic
control and manually set valve position.
When the instrument is in manual mode, the upper display shows
the measured value, the middle display shows the power output
[preceded by
H
(for heating action) or
C
(for cooling action)] while
the lower display continue to show the valve position (measured
or calculated according to [58] Pot parameter setting).
MAN
LED is lit.
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 it can be modified using the
and
buttons.
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.
8.6 Stand by mode
This operative mode also deactivates the automatic control
but forces the control output (valve position) 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 middle 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 self-tune
execution, the self- tune function will be aborted.
3.
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).
9 ERROR MESSAGES
9.1 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 6.6).
3.
If no error is detected, send the instrument to your
supplier to be checked.
9.2 List of possible errors
9.2.1 Controller errors
Displayed
message
Description
ErAT
Fast Auto-tune cannot start. The PV (measured value)
is too close to the set point. Push the
button in
order to delete the error message
NoAt
Auto-tune not finished within 12 hours
ErEP
Possible problem in the instrument memory. The
message should automatically disappear, if the error
persists, send the instrument to your supplier
RonE
Possible problem of the firmware memory. If this error
is detected, send the instrument to your supplier
Errt
Possible problem of the calibration memory. If this error
is detected, send the instrument to your supplier
9.2.2 Errors connected to potentiometer usage
Displayed
message
Description
E.p.r.e
Potentiometer reversed. The indication disappears when
the
button is pressed (the instrument returns to the
P.cAL
parameter)
no.Pt
No potentiometer. The indication disappears when the
button is pressed (the instrument returns to the
P.cAL
parameter)
E.p.cA
Potentiometer calibration error. The indication disap-
pears when the
button is pressed (the instrument
returns to the
P.cAL
parameter)
