Watlow Integrated Controller Rev C EZ-ZONE PM, User Manual

Wa t l o w   E Z - Z O N E

®

  P M   I n t e g r a t e d   C o n t r o l l e r  

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C h a p t e r   9   F e a t u r e s

 Saving and  Restoring User Settings

Recording setup and operations parameter settings 
for future reference is very important. If you uninten-
tionally change these, you will need to program the 
correct settings back into the controller to return the 
equipment to operational condition.

After you program the controller and verify 

proper operation, use  User Save Set  

[USr;S]

 (Fac-

tory Page, Diagnostics Menu) to save the settings 
into either of two files in a special section of memory. 
If the settings in the controller are altered and you 
want to return the controller to the saved values, use 
 User Restore Set  

[USr;r]

 (Factory Page, Diagnostics 

Menu) to recall one of the saved settings.

A digital input or the Function Key can also be 

configured to restore parameters.

Note: Only perform the above procedure when you are sure that 
all the correct settings are programmed into the controller. Sav-
ing the settings overwrites any previously saved collection of 
settings. Be sure to document all the controller settings. 

 Programming the Home Page

Watlow’s patented user-defined menu system im-
proves operational efficiency. The user-defined  Home 
Page provides you with a shortcut to monitor or 
change the parameter values that you use most of-
ten.

You can create your own Home Page with as 

many as 20 of the active parameters. When a param-
eter normally located in the Setup Page or Opera-
tions Page is placed in the Home Page, it is acces-
sible through both. If you change a parameter in the 
Home Page, it is automatically changed in its origi-
nal 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  

[CUSt]

 (Factory Page).

 Tuning the PID Parameters

 Autotuning

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  

[A;tSP]

 (Operations Page, Loop 

Menu) is set to 90 percent, the autotune function 
utilizes 180° for tuning. This is also how autotun-
ing works in previous Watlow Winona 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 af-
fect.

A new feature in EZ-ZONE

®

 PM products will al-

low set point changes while the control is autotun-
ing, this includes while running a profile or ramping. 
When the auto tune is initially started it will use 
the current set point and will disregard all set point 
changes until the tuning process is complete. Once 
complete, the controller will then use the new set 
point.

This is why it is a good idea to enter the active set 

point before initiating an autotune.

Autotuning calculates the optimum heating and/

or cooling PID parameter settings based on the sys-
tem's response. Autotuning can be enabled whether 
or not TUNE-TUNE+™ is enabled. The PID settings 
generated by the autotune will be used until the au-
totune feature is rerun, the PID values are manually 
adjusted or TRU-TUNE+

®

 is enabled. 

To initiate an autotune, set  Autotune Request 

[`AUt]

 (Operations Page, Loop Menu) to 

[`YES]

. 

You should not autotune while a profile is running. If 
the autotune cannot be completed in 60 minutes, the 
autotune will time-out and the original settings will 
take effect.

The lower display will flash between 

[tUnE]

 and 

the set point while the autotuning is underway. The 
temperature must cross the Autotune Set Point five 
times to complete the autotuning process. Once com-
plete, the controller controls at the normal set point, 
using the new parameters.

Select a set point for the tune with Autotune Set 

Point. The Autotune Set Point is expressed as a per-
cent of the Closed Loop Set Point.

If you need to adjust the tuning procedure's ag-

gressiveness, use  Autotune Aggressiveness  

[T;Agr]

(Setup Page, Loop Menu). Select under damped 

[Un-

dr]

 to bring the process value to the set point quick-

ly. Select over damped 

[ouer]

 to bring the process 

value to the set point with minimal overshoot. Select 
critical damped 

[Crit]

 to balance a rapid response 

with minimal overshoot.

Time

Temperature

Autotune begins

Process Set Point

Autotune Set Point

(90 percent of Process Set Point)

Autotune complete