West Control Solutions MRC 8000 - Manual (Page 42)

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4.1.2.7 PROPORTIONAL OUTPUT PERCENTAGE DISPLAY
While in the Control mode, pressing the UP and the SCROLL keys at the same time will
cause the display to sequence through a series of display codes and values:
Po1 Percent Output (if applicable) Output 1% value
Po2 Percent Output (if applicable) Output 2% value
Proc Process Value Actual Process Value
Each code and output value will be displayed only if the corresponding proportional output is
present. Each code or value will be displayed for 1 second. This sequence of displays will
continue until the SCROLL key is pressed, which will then return the display to the normal
mode. Displays will sequenced for both Pen 1 and 2 as applicable on dual pen instruments.
4.1.3 MANUAL MODE FOR PROPORTIONAL OUTPUTS
(APPLIES TO RECORDING CONTROLLERS)
Manual adjustment of the proportional output(s) can be used to test the operation of the
output(s), while tuning to establish basic process control, or to provide control of the propor-
tional output(s) during the occurrence of certain error conditions.
Note: The proportional outputs do not change automatically in response to changes in
the process while in the Manual mode. Be sure to pay close attention to the process to
avoid damage.
To enter the Manual mode, pres and release the AUTO/MAN key for the specific pen. If the
Standby mode is On in the Enable mode and a control output is selected for proportional
control, the instrument will enter the Manual mode. The Manual mode status LED will light for
that pen to indicate that the Manual mode is in use. Shifting from the Control to the Manual
mode is bumpless. The proportional output(s) will stay at the last value(s) calculated by the
control algorithm. Po1 will appear on the display if output 1 is a proportional output or Po2 if
output 1 is not a proportional control.
In order to vary a proportional output value, press and release the SCROLL key until the
display code for the output is displayed, Po1 or Po2. Press the SCROLL key again to see the
percentage of output value. Press the UP key to increase the output percentage value. Press
the DOWN key to decrease the output percentage value.
If no keys are pressed, the display will sequence through the following displays:
Po1 if output 1 is 3, 4, 5, 6, 7 then the output 1 percentage of output value
Po2 if output 2 is 3, 4, 5, 6, 7 then the output 2 percentage of output value
Proc will be displayed then current process value for that pen
In order to change a proportional value once the cyclic display begins, press and release the
UP or DOWN key then press the SCROLL key until the display code for the output displayed
is Po1 or Po2. Press the SCROLL key again to see the percentage of output value. Press
the UP key to increase the output percentage value. Press the DOWN key to decrease the
output percentage value.
To return to the Control mode of operation from the Manual mode, press the specified AUTO/
Man key. If the Automatic Transfer feature is selected in the Program mode, the instrument
will switch from Manual mode to the Control mode when process value reaches the setpoint
value.