Power Supply Unit; Start-Up Operation; Expansion Modules - Diehl Metering 548 Manual De Instalación

5.2 Power supply unit

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24 VAC or 230 AC power supply units can be changed to or retrofitted
at any time.
It is strictly necessary to have protective safety cover installed at
all times.
Under no circumstances connect between the two phases other-
wise the power supply unit will be destroyed.
ƒ
The cable is to be fused at max. 6 A and protected against manipulation.
ƒ
The power supply unit notifies the meter if mains voltage is present.
ƒ
If the power supply fails, the backup battery (CR2032) provides the
power supply for up to 1 year. The LCD readings (on pressing button)
and the date and time are still updated, but none of the measur-
ing functions work, incl. the flow rate measurement. Communication
still functions over the optional M-Bus, RS485, RS232 modules or the
optical interface, but reduces the life of the backup battery. The radio
function is switched off in the event of power supply failure.
6.

Start-up operation

Once the calculator has been installed, the components (calculator, vol-
ume measuring component and both temperature sensors) must be
sealed and the calculator taken into operation.
ƒ
Check the display for a plausible indication of flow rate and temper-
atures.
Operating Instructions
www.diehl.com/metering.
7.

Expansion modules

The calculator has two slots for expansion modules.
They can be mixed, but two pulse modules of the same kind must not be
installed.
The analog module occupies both positions.
These modules have no effect on consumption recording and can be fitted
retrospectively without damaging the verification mark.
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