West Control Solutions CALogix - Manual (Page 17)

4. Once these settings have been made click on apply to write to the controller.
PARK MODE
Once initial settings are written to the controller it will still be in park mode i.e outputs to the controller are disabled. To
take the controller out of park, change mode (setpoint 1 settings) to control type required i.e P (proportional), PI
(proportional integral), PID (proportional integral derivative), PD (proportional derivative) or ON/OFF control.
SETPOINT ADJUSTMENT
Before carrying out an autotune or run with the default settings ensure the system is safe to operate at the setpoint value.
To enter or adjust a setpoint 1:
1. Right click on controller image.
2.
Mouse-over properties and select programmer and set-points.
3. Expand (+) setpoints menu.
4. Enter
Setpoint 1 value for the required module (click out of value box once setting entered to ensure value is
accepted)
5. Apply setting and click OK
6. New setpoint is now written to the controller and should be visible on controller image.
Changes in setpoint 2 and 3 are made in the settings menu see PID module settings
AUTOTUNE
This is a single shot procedure to match the PID module to the process. Select either tune or tune-at-setpoint in the
mode
parameter of autotune settings for a specified module. The criteria for choosing the best autotune mode for an
application is given below.
The tune-at-setpoint program is recommended when:
The process is already at setpoint and control is poor.
The setpoint is less than 100°C in a temperature application
Re-tuning after a large setpoint change.
Tuning multi-zone and/or heat-cool applications.
Notes : DAC is not re-adjusted by tune-at-setpoint.
Before running autotune select whether autotune calculated proportional cycle time is to be used see below.
The tune program should be used for applications other than those listed for tune-at-setpoint shown above.
As autotune is running, tune or atsp is displayed on the CALogix module image within CALogix-sw.
Once tuning is complete, the message will no longer be visible.
PROPORTIONAL CYCLE-TIME
The choice of cycle-time is influenced by the external switching device or load. eg. contactor, SSR, valve. A setting that is
too long for the process will cause oscillation and a setting that is too short will cause unnecessary wear to an electro-
mechanical switching device.
To select AUTOTUNE calculated CYCLE-TIME
− In ‘autotune settings’ menu for chosen module, change autotune cycle-time parameter to yes.
If the autotune cycle-time is not required, set parameter as no and cycle time parameter value in setpoint settings will
be used. (default value 10S)
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