West Control Solutions Pro-EC44 - Manual (Page 75)

Pro-EC44 2-Loop Graphical Profile Controller & Recorder
Pro-EC44 Product Manual - 59540-1 October 2013 Page 68
Automatic Tuning Menu
The automatic tune menu is used to engage pre-tune and/or self-tune to assist setting up
proportional bands and the integral and derivative time values used by the control loops.
Pre-tune can be used to set PID parameters approximately. Self-tune may then be used to
optimise the tuning if required. See the Tuning section on page 99 for more information.
Pre-tune can be set to run automatically after every power-up by enabling Auto Pre-Tune.
Entry into the Automatic Tuning Menu
The Automatic Tuning Menu is entered from the Main Menu
Hold down
R
and press
U
to enter the Main Menu.
Press
D
or
U
to select the Automatic Tuning Menu.
Press
R
to enter the Automatic Tuning Menu.
Navigating the Automatic Tuning Menu
Press
R
to move forward or
L
to move backwards through the selections.
Press
D
or
U
to change values or engage and disengage the tuning as required.
Hold down
R
and press
U
to return to the Main Menu
Scrolling “Help Text” is shown at the bottom of the screens to aid navigation.
 AUTOMATIC TUNING MENU SCREENS
Automatic Tuning
Mode Unlocking Enter correct code number to access the Automatic Tuning Menu.
Factory Default value is 10.
Control loop 1 or 2 Select which control loop you want to tune –if unit has 2 control loops.
Cascade Mode To pre-tune a cascade slave, select open-cascade.
Note: When slave tuning is completed, repeat choosing open-cascade
to tune the master.
Pre-Tune Method From: Pre-Tune Standard or Pre-Tune at Value. Standard Pre-Tune tests
the process response half-way from the activation point to the setpoint.
Pre-Tune at Valve allows the user to specify where the test occurs.
Pre-Tune Value Sets the value at which the process is tested for Pre-Tune at Valve.
Caution: Consider possible over-shoot!
Pre-Tune Save
Location Store the pre-tune result to one of 5 PID sets. The new PID terms can be
stored to any set, without changing the “active set” from control
configuration.
Run Pre-Tune on Set
n Now? w Turns pre-tune on/off for the chosen PID Set. If configured, the TUNE LED
indicator flashes whilst pre-tune is operating - *see below.
Note: Pre-tune is disabled in on-off control mode; if the PV is less than
5% of span from setpoint; during Profiles; if the setpoint is ramping or if
the selected control loop has been disabled.
Pre-Tune Status Shows the current pre-tune status: Running or Stopped. If an attempt to
run pre-tune failed, the reason is shown.