85
SC-F70
SC-F70
PID Operation Operating Instructions
1 Controller problems
The controller has a self-test function that checks the internal logic
validity and the voltage. If an internal error is detected, the FAIL
lamp comes on to let the operator know.
The controller also checks the validity of key inputs, the input value
from the sensor, and inputs from external contacts. If invalid inputs
are detected, the controller displays an error code according to the
error source.
The controller problems fall into two categories:
∑
Error-displayable controller problems
∑
No error-displayable controller problems
2 Actuator control problems
The controller supplies the output developed from the target value
and other control factors to the actuator. There are three types of
actuator control problems.
∑
Actuator itself or its wiring problems
∑
Controller output problems
∑
Setting errors or usage outside of specifications
3 Sensor problems
The controller receives a measured signal from the sensor, shows it
on the Measurement Display on the panel, or calculates the
deviations. There are three types of sensor-related problems.
∑
Sensor itself or its wiring problems
∑
Controller receiving problems
∑
Setting errors or usage outside of specifications
4 Remote external input problems
If the controller works without any problems in LOC mode, but
experiences a problem when used in REM mode with external
contacts, it may be an external contact or external analog input
device problem. There are three types of external contact problems.
∑
External contact or wiring problems
∑
External analog input device or wiring problems
∑
Setting errors or usage outside of specifications
