44
Appendix E
Glossary of Terms
Alarm
A condition that exists if the process variable exceeds internally stored
alarm setpoints. Those setpoints can be:
Alarm Inhibit
Prevents low setpoint alarm activation during cold startup applications.
Auto/Manual
Alternative control conditions that can be selected within the controller.
Manual - An open loop condition, in which the power to the process is
manually set and not influenced by the sensor.
Auto-A closed loop condition, in which the power to the process is
automatically computed and set by the sensor output relative to the
setpoint.
Bias
Allows the operator to compensate for any difference between sensor
temperature and the point to be measured. The process display and
setpoint will be offset by the value entered in the Bias parameter in the input
menu. Example: Desired temperature is 150 degrees. Sensor is adjacent to
heater and reads 50 degrees higher than the actual process temperature.
Enter bias of -50. Enter setpoint of 150. Process will display 150 even
though sensor will be measuring 200 degrees.
Cycle Time
The period of time in which the controller’s output completes an on-off cycle
(proportional output type only). Example: Output type = mechanical relay;
cycle time = 10 seconds; Output power = 50%; controller output = 5
seconds closed, 5 seconds open.
Summary of Contents for M2B
Page 1: ... Rev A ...
Page 49: ...48 ...
