ATC770 Microprocessor-Based Pressure/Process Controller 43
6.4.2 MAKING THE CONTROL OUTPUT DIRECT/REVERSE SELECTION
The input signal can cause the control output to either increase or decrease with an increasing or
decreasing input signal. The table below shows the value of Direct/Reverse Control Output selection
(CO.D/R)
. The first digit shows the relationship between the input signal and the displayed output
value
(OUT%)
. The last digit shows the relationship between the displayed output signal and the
output value voltage or current.
Value Input Signal Displayed Output Control Output
r d
0-100 (increase) 100-0 (decrease) 100-0 (decrease)
r r
0-100 (increase) 100-0 (decrease) 0-100 (increase)
d d
0-100 (increase) 0-100 (increase) 0-100 (increase)
d r
0-100 (increase) 0-100 (increase) 100-0 (decrease)
The default value is
r d
(Reverse-Direct), or decreasing the Displayed and Control outputs with
increasing signal.
6.4.3 SETTING THE CONTROL OUTPUT LIMIT
The Control Output Signal can be limited to a specific percentage value to prevent downstream
problems. To set the Control Output Limiter parameter
(CO.MAX)
, press the FUNC key until
nonE
and
GROUP
show on the display. Press the ▲ key until
4
shows in the upper display. Press the
FUNC key until the lower display shows
CO.MAX
. Using the ▼ or ▲ keys, select the desired value
from 10.0 to 100.0%. When finished, press the FUNC key to lock in the value and A/M to return to
the main screen.
6.4.4 SETTING THE CONTROL OUTPUT MANUAL MORE INDICATION
This parameter is used to select how the controller shows the output value in manual mode: either
in the range of 0-100%, or scaled with the
CO.HI
and
CO.LO
parameters. The default value is 0-
100%. To confirm or change this value, press the FUNC key until
nonE
and
GROUP
show on the
display. Press the ▲ key until
4
shows in the upper display. Press the FUNC key until the lower
display shows
CO.MMI
. Using the ▼ or ▲ keys, select either
100.0%
or
rPn
(for RPM indication).
When finished, press the FUNC key to lock in the value, and A/M to return to the main screen.
6.4.5 SETTING THE CONTROL OUTPUT DISPLAY
The Control Output Display can be changed to reflect RPM or some other external parameter.
However, since this is arbitrary and will be tuned to a specific device, it is recommended to skip this
section and use the defaults.
To change the Control Output Range Low
(CO.LO)
from the standard
0
value, press the FUNC key
until
nonE
and
GROUP
show on the display. Press the ▲ key until
3
shows in the upper display.
Press the FUNC key until the lower display shows
CO.LO
. Using the ▼ or ▲ keys, select the
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