Alarm Silencing

If alarm silencing is on the operator can disable the alarm output while the controller is in an alarm state. The process value or temperature has to enter the normal operating range beyond the hysteresis zone to activate the alarm output function again.

An active message, such as an alarm message, will cause the display to toggle between the normal settings and the active message in the upper display and [Attn] in the lower display.

Push the Advance Key to display [ignr] in the upper display and the message source in the lower display.

Use the Up ¿ and Down ¯ keys to scroll through possible responses, such as Clear [`CLr] or Silence [`SiL]. Then push the Advance ‰ or Infinity ˆ key to execute the action.

See the Keys and Displays chapter and the Home Page chapter for more details.

Turn alarm silencing on or off with Silencing [`A;Si] (Setup Page, Alarm Menu).

Alarm Blocking

Alarm blocking allows a system to warm up after it has been started up. With alarm blocking on, an alarm is not triggered when the process temperature is initially lower than the alarm low set point or higher than the alarm high set point. The process temperature has to enter the normal operating range beyond the hysteresis zone to activate the alarm function.

If the EZ-ZONE®PM has an output that is functioning as a deviation alarm, the alarm is blocked when the set point is changed, until the process value re-enters the normal operating range.

Turn alarm blocking on or off with Blocking [`A;bL] (Setup Page, Alarm Menu).

Current Sensing

Open heater circuit detection

Current Error [`C;Er] (Operations Page, Current Menu) detects an open load circuit if no current is flowing through the current transformer when the output is active and the load is supposed to be on.

Shorted heater circuit detection

Current Error detects a shorted load circuit if current is flowing through the current transformer when the output is inactive and the load is supposed to be off.

Set the current detect set points with High Set Point [`C;hi] and Low Set Point [`C;Lo] (Operations Page, Current Menu).

View the current level and most recent faults with Read, Current Error [`C;Er] (Operations Page, Current Menu) and Heater Error [`h;Er] (Operations Page, Current Menu).

Programming the EZ Key

You can program the EZ Key either in the Setup Menu or with configuration software, such as EZ- ZONE® Configurator, using a personal computer.

The following examples show how to program the EZ Key to start and stop a profile.

Using keys and display:

1.To go to the Setup Page from the Home Page, press both the Up ¿ and Down ¯ keys for six sec- onds. [``Ai] will appear in the upper display and [`Set] will appear in the lower display.

2.Press the Up Key ¿ until [`Fun] appears in the upper display and [`SEt] will appear in the lower display.

3.Press the Advance Key ‰ until Digital Input Level [`leu] appears in the lower display. Use an ar- row key to specify the state of the key (high or low) when the controller is powered up. Functions will toggle with each press of the EZ Key, such as Pro- file Start/Stop.

4.Press the Advance Key ‰. The lower display will show Digital Function [``Fn]. Press the Up ¿ or Down ¯ key to scroll through the functions that can be assigned to the EZ Key

When Profile Start/Stop [P;StS] appears in the upper display and [``Fn] appears in the lower display, press the Advance Key ‰ once to select that function and move to the Function Instance [``Fi] parameter.

5.Press the Up ¿ or Down ¯ key to scroll to the profile that you want the EZ Key to control.

6.The instance tells the controller which of the numbered functions should be acted upon. For profiles, there are 4 instances. Press the Infinity Key ˆ once to return to the submenu, twice to return to the main menu or three times to return to the Home Page.

Using the software with Standard Bus:

1.Make the necessary physical connections between the personal computer and the EZ-ZONE®PM. Set Protocol (Setup Page, Communications Menu) to Standard Bus. Run the software and allow it to connect to the controller by directing it or al- lowing it to find the appropriate communications port.

2.After the software connects to the controller, look on the left side of your screen under the Param- eters Menus for Function Key under Setup. Click on the plus sign to reveal the Function Key 1 submenu.

3.Click on Function Key 1, then select a Digital In- put Function and a Function Instance.

If you want to start and stop a profile with the EZ Key, select Profile Start/Stop and the number of the profile that you want the EZ Key to control.

Watlow EZ-ZONE®PM Integrated Controller

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Chapter 9 Features