ATC770 Microprocessor-Based Pressure/Process Controller 59
Correction: An instrument set for strain gage input with NO transducer connected will
display this error. Connect a transducer to the instrument to remedy this condition. If there is
a transducer connected, disconnect it from the wiring, and either replace the wire, or check
the continuity of EACH wire, and that there is no short between any of the wires. If the
cable is good, substitute a known good transducer to determine if the transducer is
damaged. If the good transducer shows the same error, send the instrument to Dynisco for
repair (See Section 11.)
PR EE
Wrong value of EEPROM protect register.
Correction: Turn the power to the instrument off. Change the internal jumpers to calibration
mode (see Section 8.0), and re-power the instrument. In calibration mode, the registers will
be properly re-written on power-up. When this is done return to normal operating mode.
RAM
Failure of RAM circuit. There is no correction; the device needs to be sent to Dynisco for
repair (See Section 11).
9.2 “OPEN” ERROR CODE AND TROUBLESHOOTING
The display will show “OPEN” under one or more of the following conditions:
• A/D converter saturation
• Input current lower then 0.8 mA (for 4-20 mA inputs)
• Pressure input lower then -25% or higher then 125% of full scale value.
• “SIG +” or “SIG -” wire unconnected for strain gage input
• Remote set point input lower then -1% or higher then 101% of full scale value
• Connection cable wire broken or two wires shorted together
•The Orange (CAL2) and Blue (CAL1) wires are on the wrong terminals for a strain gage
transducer. The Orange (CAL2) wire connects to terminal 17 (EXC-) together with the Green
wire. The Blue (CAL1) wire connects to terminal 14. If the transducer is wired to DHF or
(WRSG) Western Regional Strain Gage standards, contact Dynisco Technical Service at 800-
221-2201
9.3 INSTRUMENT MAINTENANCE
1. REMOVE POWER FROM THE POWER SUPPLY TERMINALS AND FROM RELAY OUTPUT
TERMINALS
2. Remove the instrument from case
3. Using a vacuum cleaner or a compressed air jet (max. 42PSI) remove all deposits of dust and
dirt which may be present on the louvers and on the internal circuits trying to be careful not to
damage the electronic components.
4. To clean external plastic or rubber parts use only a cloth moistened with:
• Ethyl Alcohol (pure or denatured) (C2H5OH) or
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