Manual-automatic transfer:

The manual-automatic (M-A) transfer switch, instantly below the outcome meter, selects operating mode of the controller.

A manual output adjust knob, within the center of the M-A transfer switch, varies the controller outcome signal in manual mode of operation.  A knob is rotated clockwise to increase the signal and counterclockwise to decrease the signal.

The M-A transfer switch has five positions which alter the mode of operation. The indication is given through the deviation meter.

AUTO  This is the normal position of the M-A transfer switch. That places the controller in the automatic mode of operation.  In addition, the deviation meter denotes any deviation among controlled variable and setpoint.

0 - 100 (AUTO side) Within this position, a controller is still in automatic mode. Therefore, the deviation meters now the estimated value of the controlled variable. A deviation meter deflects full down for zero variable value and full up for 100 percent variable value.

MAN  This position places the controller in the manual mode of operation. Controller outcome is now varied through adjusting the manual outcome adjust knob. This adjustment is denoted on the output meter. The deviation meter denotes any deviation among controlled variable and setpoint.

0 - 100 (MAN side) The controller is still within the manual mode of operation, and the deviation meter denotes controlled variable value (0 percent to 100 percent) as it did in the 0-100 (AUTO side) position.

BAL In several cases, controller outcome signals of the automatic mode and manual mode might not be the similar. The controller output signal could suddenly change from one value to another if the controller were straightly transferred from automatic to manual or manual to automatic. Conclusion, the last control element would experience a sudden change in position or "bump."  This could cause huge swings in the value of the possible damage and process variable to the last control element.