ATC770 Microprocessor-Based Pressure/Process Controller 57
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.
NOTE: A dry contact switch or relay must be fitted between terminal 62 (Common) and terminal 63
(Digital Input 1 Remote AUTO/MAN (DIG1)) to enable the use of Digital Input 2 (DIG2) and
3 (DIG3) (Control output value increase and decrease).
To verify this parameter or to change it, press the FUNC key until the lower display shows
A/M
.
Press the ▲ or ▼ key until the upper display shows the correct value (
LoCAL
or
CnCt
). 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.
This function is used to select the Communication Baud Rate. To view or access this function, press
the FUNC key until
nonE
and
GROUP
Further documentation is available in Dynisco’s publication #974089
Modbus/J-Bus Protocol for
Dynisco UPR700/ATC770
. Please contact Dynisco at 800-221-2201 for a copy of this manual.
9. ERROR CODE
On power up, the ATC770 will enter a self-test mode to evaluate the condition of the equipment. If
an error is detected, the screen will show an error code number in the upper display and the
mnemonic
Err
, in the lower display.
9.1 ERROR CODES AND TROUBLESHOOTING
The errors codes and their possible causes and solutions are as follows:
TI
Parameter Error during self-test.
Correction: The instrument detected a parameter error. If it is a run-time parameter (i.e. from
SP
to
RO.TYP
), press the ▲ or ▼ push-buttons together to have the instrument load the
default parameters for all groups of parameters. However, if it is a calibration or code
parameter, press FUNC and A/M together to access to these parameters. This function is
only intended to restore a misplaced parameter’s value, and the performance of the
instrument may be unstable and will not be guaranteed. The user is advised to check and re-
enter the stated calibration or code parameters.
1
Error during EEPROM access.
Correction: De-power the instrument and wait for 60 seconds. On power-on the situation
should clear itself. If it does not correct itself de-power again. If the error still remains, send
the instrument to Dynisco for repair (See Section 11.)
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