3.3 External Power Supply (Option U)
If the instrument is intended to have an external voltage supply the power
supply plug-in module with option U (OA 5590-U) and the connecting cable ZB
5090-EK with 2 banana plugs is required. It has a wide input voltage range
from 9 to 36V DC and an electrical isolation allowing that the measuring
instrument can be operated with 12V or 24V mains supply. Further, the mains
adapter ZB 5090-NA3 still allows for operation with mains supply.
3.4 Switch On/Off, Reinitialisation
After the voltage supply has been correctly connected the green control lamp
SUPP, located on the front panel (1), will be on. If a rechargeable battery is
installed the lamp is used for charge control (see 3.2).
For switching on
the device the rocker switch (1) must be operated. Then the
red control lamp ON will be on and indicate that the instrument is operational.
When switching off
the instrument the red control lamp turns off again.
However, the real time clock continues its operation and all stored data remain
available (see 3.5).
If the device shows an irregular behaviour due to interference influences (e.g.
electrostatic charging or discharged buffering battery) or if incorrect
programming must be avoided, the device can be completely reinitialised.
The
reset
can be achieved if the key
CLEAR
is pressed during switch-on. All
internal data such as max, min and average values, and the data memory will
be cleared. Furthermore, cycles, time, date and device address are set to zero
and the conversion rate and atmospheric pressure will be set to the standard
values. However, the device configuration and the sensor programming within
the ALMEMO
®
connectors will not be affected by the reset.
3.5 Data Buffer
For an uninterrupted power supply of the real time clock and the memory a
NiCd rechargeable battery (2.4V) for buffering is installed, which ensures that
time and date data and all stored values are maintained for several months if
the mains supply is not available. However, to prevent the rechargeable battery
from completely discharging and to avoid the loss of data, the instrument
should be operated with mains supply for a few hours at least once per month.
15
ALMEMO
®
5590-2
Power Supply
Summary of Contents for Almemo 5590-2 V5
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