Sterlco Micro Series Water Temperature Control Unit - Manual (Page 7)

3200 Series
ACS 3216 Operators Manual 7
3.1.4 Auto, Manual and Off Mode
The controller can be put into Auto, Manual or Off mode –
see next section.
Auto mode is the normal operation where the output is
adjusted automatically by the controller in response to
changes in the measured temperature.
In Auto mode all the alarms and the special functions (auto
tuning, soft start, timer and programmer) are operative
Manual mode means that the controller output power is
manually set by the operator. The input sensor is still
connected and reading the temperature but the control loop
is ‘open’.
In manual mode the MAN beacon will be lit, Band and
deviation alarm are masked, the auto-tuning timer and
programmer functions are disabled.
The power output can be continuously increased or
decreased using the or buttons.
! Manual mode must be used with care. The power
level must not be set and left at a value that can damage
the process or cause over-heating. The use of a separate
‘over-temperature’ controller is recommended.
Off mode means that the heating and cooling outputs are
turned off. The process alarm and analogue retransmission
outputs will, however, still be active while Band and
deviation alarm will be OFF.
3.1.5
To Select Auto, Manual or Off Mode
Press and hold and (Mode) together for more
than 1 second.
This can only be accessed from the HOME display.
1.
Auto’ is shown in the upper display.
After 5 seconds the lower display will
scroll the longer description of this
parameter. ie ’ l o o p m o d e – a u t o
m a n u a l o f f ’
2. Press to select ‘
mAn’. Press
again to select ‘
OFF’. This is shown in
the upper display.
3. When the desired Mode is selected, do
not push any other button. After 2
seconds the controller will return to the
HOME display.
4. If OFF has been selected,
OFF will be shown in the
lower display and the heating and cooling outputs will
be off
5. If manual mode has been selected, the MAN beacon
will light. The upper display shows the measured
temperature and the lower display the demanded output
power.
☺
The transfer from Auto to manual mode is ‘bumpless’.
This means the output will remain at the current value
at the point of transfer. Similarly when transferring
from Manual to Auto mode, the current value will be
used. This will then slowly change to the value
demanded automatically by the controller.
6. To manually change the power output, press or
to lower or raise the output. The output power is
continuously updated when these buttons are pressed
7. To return to Auto mode, press and
together. Then press to select ‘
Auto’.
t + u
t
t + u