Watlow EZ-ZONE PM - Manual (Page 76)

Watlow EZ-ZONE ® PM Limit Controller • 73 • Chapter 8 Features
How to Restore Original PM Model Number
1. Enter Factory Page [FCty] , Calibration Menu [`CAL] via front panel or using EZ-ZONE Configurator
Software.
2. Once there, using the green advance button navigate to the Part Number [``Pn] prompt (lower display).
The upper display will show User [User] indicating the control is currently a PM Express.
3. Push the green advance button one more time where the Public Key [Code] prompt will be displayed in
the lower display and the number [4999] in the upper display.
4. Using the up or down arrow keys enter 606 and push the green advance button to execute the change.
Note:
When switching from a PM Express back to the original model number all original optional hardware will
again be enabled for use (assuming all original hardware is still installed). Also, when executing this step
the control will be factory defaulted and then reset back to the original model number (as shown on the side
of the control) at zone address 1. This User's Guide would once again apply to this control.
Saving and Restoring User Settings
Recording setup and operations parameter settings for future reference is very important. If you unintention-
ally change these, you will need to program the correct settings back into the controller to return the equip-
ment to operational condition.
After you program the controller and verify proper operation, use User Settings Save [USr;S] (Setup Page,
Global 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]
(Setup Page, Global Menu) to recall one of the saved settings.
A digital input or the Function Key can also be configured to restore user settings.
Note:
Only perform the above procedure when you are sure that all the correct settings are programmed into the
controller. Saving the settings overwrites any previously saved collection of settings. Be sure to document all
the controller settings.
Note:
The control can also be brought back to the factory defaults. When doing so all previous user settings will be
deleted, this would include user setting 1 and 2 along with any previously configured I/O assemblies.
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 nor-
mally 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 automatically 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 [CUSt] (Factory Page).
Inputs
Calibration Offset
Calibration offset allows a device to compensate for
an inaccurate sensor, lead resistance or other fac-
tors that affect the input value. A positive offset
increases the input value, and a negative offset de-
creases the input value.
The input offset value can be viewed or changed
with Calibration Offset [`i;CA] (Operations Page,
Analog Input Menu).
Time
Temperature
Temperature Reading
from Sensor
Actual Process Temperature
Negative Calibration Offset will
compensate for the difference
between the Sensor Reading and
the Actual Temperature