ATC770 Microprocessor-Based Pressure/Process Controller
43
6.4.2 M
AKING
THE
C
ONTROL
O
UTPUT
D
IRECT
/R
EVERSE
S
ELECTION
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 S
ETTING
THE
C
ONTROL
O
UTPUT
L
IMIT
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 S
ETTING
THE
C
ONTROL
O
UTPUT
M
ANUAL
M
ORE
I
NDICATION
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 S
ETTING
THE
C
ONTROL
O
UTPUT
D
ISPLAY
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
Summary of Contents for ATC770
Page 19: ...ATC770 Microprocessor Based Pressure Process Controller 19 Fig 2 ATC770 Outline Drawing...
Page 23: ......
Page 30: ...30 Fig 6 Remote Set Point Jumper Location Board E...
Page 84: ...NOTES...
Page 85: ...NOTES...
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