Manual Operation Of Proportional Outputs 4.9; Automatic Transfer Function 4.10 - Partlow MIC 2000 Installation And Operation Manual

Manual Operation of Proportional Outputs 4.9

The Auto/Manual switching function applies to proportional control outputs only.
Switching between the automatic and manual control modes is accomplished by scrolling to
the Standby mode and pressing the DOWN key to enter the mode. Switching from automatic
to manual is always bumpless.
CAUTION: If the unit is in the Manual mode, be careful not to leave the process unwatched. Since the
unit is intentionally ignoring the setpoint, it is possible to unintentionally let the process exceed safe
limits. Limit devices must be used to guarantee the process does not get out of control.
The proportional output values initially displayed upon entry into the Standby mode will be the
last output values calculated by the control algorithm. Changes made to output values are
made "on-line".
When the unit is placed in manual, Po1 and/or Po2, as approporiate, will appear in the
display. If the keys are depressed within 5 second intervals, the units will respond as follows:
If a code is displayed:
SCROLL - The corresponding value will be displayed
DOWN - The next code will be displayed
If a value is displayed:
SCROLL - The next code will be displayed
UP - The value will increment
DOWN - The value will decrement
To exit from the Standby mode (manual operation), depress the UP key twice. (Pressing the
UP key once stops the cyclic display and leaves the controller in Standby) The controller will
be in automatic control with Stby displayed. After a time-out period, the unit will display Crtl.
To get directly to the Ctrl display, press the UP key three times instead of twice. Shifting to
the Control mode is balanceless.
STANDBY MODE FLOW CHART

Automatic Transfer Function 4.10

Automatic transfer provides automatic switching from the Manual mode to the Control mode of
operation when the process value reaches setpoint. This feature is selectable in the Program
mode.
NOTE: If an error condition occurs while in the Manual mode and Automatic Transfer
Function is selected, the output will go to a Failsafe condition.
StbY
Po1
Po2
P 41
AGE
K e y
Actual Display
On/Off Display -
ON
Use arrow keys
OFF
to turn on or off
Scroll Key
Numeric Display -
Use arrow keys
to change value
Up Arrow Key
Down Arrow