ATC770 Microprocessor-Based Pressure/Process Controller 55
3. The display values for analog inputs are scaled from 0 to 25,000 counts; it is also linear for RTD
input.
4. Use the ▼ or ▲ keys to select a display value from 0 to 10 and to check the linearity of output
circuit at 0%, 10%, 90% and 100% of full scale value.
5. If the values do not correspond with the values in the Calibration Parameters Summary Table
below, use the ▼ or ▲ keys to correct the value displayed.
6. When all the appropriate values are correct, set the dip switches to operating mode.
CALIBRATION PARAMETERS SUMMARY
Parameter Circuit Input Type Range Value Note
CAL ATC (2)
PL.020 Primary Input Current Zero 0 mA
PH.020 Primary Input Current Full scale 20 Ma
P.020 Primary Input Current Verify (3)
PL.05 Primary Input Voltage 0-5V Zero 0 V
PH.05 Primary Input Voltage 0-5V Full scale 5 V
P.05 Primary Input Voltage 0-5V Verify (3)
PL.010 Primary Input Voltage 0-10V Zero 0 V
PH.010 Primary Input Voltage 0-10V Full scale 10 V
P.010 Primary Input Voltage 0-10V Verify (3)
ML.CUR Main analog output Current Zero -5 mA
MH.CUR Main analog output Current Full Scale 25 mA
M.CUR Main analog output Current Verify (4)
ML.VOL Main analog output Voltage Zero -12.5 V
MH.VOL Main analog output Voltage Full scale 12.5V
M.VOL Main analog output Voltage Verify (4)
SL.CUR Second analog output Current Zero -5 mA
SH.CUR Second analog output Current Full scale 25 mA
S.CUR Second analog output Current Verify (4)
SL.VOL Second analog output Voltage Zero -12.5 V
SH.VOL Second analog output Voltage Full scale 12.5 V
S.VOL Second analog output Voltage Verify (4)
DEFLT Load default calibration DO NOT ATTEMPT TO MODIFY
and code UNDER ANY CIRCUMSTANCES
7. If the values CANNOT be made to correspond with the values in the Calibration Parameters
Summary Table, the instrument must be sent to Dynisco for repair or re-calibration.
8.3 RS-485 (OPTIONAL)
The ATC770 is available with an RS485 Digital communications port. The configuration parameters
for this option are found in the Group 3 parameters only if this option is included. The ATC770,
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