3 power supply, Mains supply, 24v supply – Dwyer UFB User Manual

Page 9: Power failure, General description

1: General Description

Figure 1.4 UFB Keypad

Menus and the menu selection keys

Note: As a security measure, once the instrument has been set-up for the first time, a password is required to
gain subsequent access to the operating menus (see page 19).

The UFB menus are arranged hierarchally with the

MAIN MENU being at the top level. Menu navigation is

achieved by three keys located on the right hand side of the keypad which are used to scroll

UP and DOWN a menu

list and

SELECT a menu item. When scrolling through a menu, an arrow-shaped cursor moves up and down the

left hand side of the screen to indicate the active menu choice which can then be selected by pressing the

ENTER

(

SELECT) key.

Some menus have more options than can be shown on the screen at the same time, in which case the
overflowed choices can be brought into view by continuing to scroll

DOWN past the bottom visible item. Menus

generally ‘loop around’ if you scroll beyond the first or last items.

If you select

Exit on any menu it usually takes you back one level in the menu hierarchy, but in some cases it

may go directly to the ‘

Flow Reading’ screen.

Some screens require you to move the cursor left and right along the display as well as up and down. This is
achieved using keys 5 (scroll

LEFT) and 6 (scroll RIGHT).

Dual function numerical keypad

The block of keys shown in the center of the keypad in Figure 1.4 are dual function keys. They can be used to
enter straight-forward numerical data, select the displayed flow units, or provide quick access to frequently
required control menus.

1.4.3 Power

supply

Mains supply

As standard, the UFB instrument is designed to work with a mains supply of 86 to 236 Vac and 50/60 Hz. A mains
supply fuse is located adjacent to the mains power connection (see Figure 2.2).

24V Supply

An alternative 24 V (ac/dc) power supply module is available as a factory fitted option.

Power failure

The instrument will automatically power-up and become operational when the input power is applied. In the event
of a power failure, the instrument’s configuration parameters are stored in non-volatile memory which then allows
the instrument to return to normal operation immediately power is restored.