ATC770 Microprocessor-Based Pressure/Process Controller 27
values must be set and the shunt capability enabled. The Shunt Calibration value is a percentage of
the full scale transducer range. If the Shunt Value is supplied as a pressure, it must be converted to
percent.
To enter the Shunt Calibration value, the shunt should first be enabled by pressing 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
SHUNT
. Press the ▼ or ▲ key until the upper
display shows the
ON
. Press the FUNC key to set the value and move to the next parameter, Shunt
%
(SHNT.%)
. Press the ▼ or ▲ key until the upper display shows the appropriate percentage for the
shunt value (normally 80%). Once the percentage value is set, press the FUNC key to set the value
and press the A/M key to go back to the active display.
5.3.2 SETTING THE LOGIC INPUT CONFIGURATION (IF SUPPLIED):
If the unit does not have the logic input option, skip to Section 5.3.4.
NOTE: Alarm and peak reset is only available when A/M in Group 1 is set to Local.
The Logic Input can be off, can be set to function as an alarm reset, a peak reset, or it can reset both.
To verify this parameter or to change it, 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
LI.TYP
. Press the ▼ or ▲ key until the upper display shows the correct selection:
OFF
,
AL
- alarms reset,
P
- Peak reset or
AL-P
). Press the FUNC key to set the value and move to the next
parameter, or press the A/M key to go back to the active display.
5.3.3 SETTING THE LOGIC INPUT STATUS (IF SUPPLIED)
The Logic Input Status can be set to Open or Closed as the active state. To verify this parameter or to
change it, 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
LI.STS
. Press the ▼ or
▲ key until the upper display shows the correct selection:
CLOSE
, or
OPEn
. Press the FUNC key to
set the value and move to the next parameter, or press the A/M key to go back to the active display.
5.3.4 SETTING THE STATUS OF AUTO/MANUAL SELECTION (IF SUPPLIED)
If the unit does not have the Digital Input option, skip to Section 5.3.5.
NOTE: Remote Auto/Manual is only available when Auto/Manual in Group 1 is set to CNCT.
The ATC770 Pressure/Process controller has four digital inputs that can switch between Manual and
Automatic control (DIG 1), increase (DIG2) or decrease (DIG3) the control output value and switch
from Automatic to Manual setting the control output to zero (DIG4). The Auto/Manual Selection
parameter determines the status of the communication protocol. Select
LoCAL
to use the front push
buttons or RS-485 to control switching from manual to automatic, or Select
CnCt
to use external
means to control switching from manual to automatic.
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