Liebert XDP user manual Valve Time, Password Security-SETPT Password and Service Password

Microprocessor Control

VALVE TIME

This value is the number of seconds it takes the control valve to travel from fully closed to fully open. If the control loses the analog feedback position from the control valve, the control will close the valve, then calculate how long to open the valve for the current call for cooling.

For example, if VALVE TIME is set to 60 seconds and there is a 50% call for cooling, the valve will open for 30 seconds, leaving the valve halfway open. To make changes or review the current setting, see 4.3.1 - Viewing or Changing Settings.

Scroll through this submenu by using the Up or Down arrow key. To make changes or review the cur- rent setting, see 4.3.1 - Viewing or Changing Settings.

For example, to change the DEWPOINT MARGIN:

a.From the main Status display, press MENU.

b.Scroll to the SETPOINTS using the Up or Down arrow key.

c.Press ENTER to select the SETPOINTS submenu.

d.Scroll to DEWPOINT MARGIN using the Up or Down arrow key.

e.Press ENTER

f.Use the Up arrow key to increase the value or use the Down arrow key to lower the value.

g.Press ENTER to store.

NOTE

Setpoints and system setup parameters are kept in non-volatile memory.

4.3.9Password Security—SETPT PASSWORD and SERVICE PASSWORD

Setpoints, setup operations and alarm settings may be secured with three-digit passwords to prevent unauthorized changes. The password function for SETPT PASSWORD and for SERVICE PASS- WORD is enabled by default. Passwords are enabled or disabled through DIP switch #8.

•To enable the password security feature, open the user interface display cover and set DIP switch #8 to the Off position, then close the cover.

•To disable the password security feature, open the user interface display cover and set DIP switch #8 to the On position, then close the cover.

Change Password—SETPT PASSWORD

The factory default SETPT PASSWORD is “123”—this password protects setpoints and some alarm settings. To change the SETPT PASSWORD:

1.Press the MENU key to display the Main Menu.

2.Use the Up or Down arrow keys to scroll to the SETPT PASSWORD function.

3.Press ENTER to access the SETPT PASSWORD function. The LCD will display three zeros (000).

4.Enter the present, three-digit password.

a.Use the Up or Down arrow key to enter the first number.

b.Press the ENTER button to select the second number in the password.

c.Use the Up or Down arrow key to enter the second number.

d.Enter the third number by repeating Steps b and c.

e.Press the ENTER button to accept the password. The LCD will display the message

PASSWORD OK.

5.Press the ENTER button; the LCD displays the message ENTER NEW PSW and the current password. The first numeral will be selected.

6.Use the Up or Down arrow key to enter the first number of the new password. Press the ENTER button to select the second numeral in the password.

7.Use the Up or Down arrow key to enter the second number of the new password. Press the ENTER button to select the third numeral in the password.

8.Use the Up or Down arrow key to enter the third number of the new password. Press the ENTER button to save the new password.

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