Programming The Home Page; Tuning The Pid Parameters; Autotune - Watlow ez-zone pm User Manual

After you program the controller and verify proper operation, select Save Settings As
(Setup Page, Global Menu) to save the settings into either of two files (
control memory.
Note:
Saving the settings overwrites any previously saved collection of settings. Be sure to docu-
ment all the controller settings.
If the settings in the controller are altered a user can return the controller to one of three
settings. If previously saved,
settings. Navigate to the Setup Page, Global Menu to find the Restore
tal input or the Function Key can also be configured to restore parameters.
Note:
When restoring factory defaults, I/O assemblies for Modbus, DeviceNet, Profibus and Eth-
ernet along with the zone address will be overwritten when restoring factory defaults.

Programming the Home Page

Watlow's patented user-defined menu system improves operational efficiency. The user-
defined Home Page provides you with a shortcut to monitor or change the parameter values
that you use most often.
You can create your own Home Page with as many as 20 of the active parameters. When
a parameter normally located in the Setup Page or Operations Page is placed in the Home
Page, it is accessible through both. If you change a parameter in the Home Page, it is au-
tomatically changed in its original page. If you change a parameter in its original page it is
automatically changed in the Home Page.
The default parameters will automatically appear in the Home Page.
Change the list of parameters in the Home Page from the Custom Menu

Tuning the PID Parameters

Autotune

When an autotune is performed on the EZ-
®
ZONE PM, the set point is used to calculate
the tuning set point.
For example, if the active set point is 200°
and Autotune Set Point
Page, Loop Menu) is set to 90 percent, the
autotune function utilizes 180° for tuning.
This is also how autotuning works in previ-
ous Watlow controllers. In addition, changing
the active set point in previous controllers
causes the autotune function to restart;
where with the EZ-ZONE PM changing the set
point after an autotune has been started has
no affect.
A new feature in EZ-ZONE PM products will allow set point changes while the control is auto-
tuning, this includes while running a profile or ramping. When the auto tune is initially start-
ed it will use the current set point and will disregard all set point changes until the tuning
Wat lo w EZ-ZO N E ® PM PI D C o n tr o lle r
or
sEt1 sEt2
(Operations
A. t sp
•
can be restored as well as the factory
Autotune begins
Autotune Set Point
(90 percent of Process Set Point)
123
•
Usr. s
or ) in the
sEt1 sEt2
fCty
prompt. A digi-
USr. r
(Factory Page).
CUSt
Process Set Point
Autotune complete
Time
Chapter 9 F e atur e s