Elgama G1B Series, Руководство пользователя

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6.9 Power supply
Pulse mode power supply is mounted in GAMA 100 meters. It guarantees stable functioning of
meter when supply voltage ranges from -20 ... +15% of nominal voltage.
In case of power outages, micro-controller switches into energy saving mode, where Li-ion battery
or supercapacitor supplies only internal clock. Li-ion battery may supply energy for not less than 10
years without main power supply.
When main power supply is in operation, energy of Li-ion battery is not consumed and/or
supercapacitor is charged.
6.9.1 Power supply for external modem
An isolated internal d.c. supply to power the modem is provided via the RJ12 socket.
The power is
sufficient to support a GSM/GPRS/3G modem with nominal v5V and mean load
≤500mA.
If a modem is installed which draws too much power from the meter, the modem power supply
is limited/disabled to prevent resetting of the meter.
Power supply recovers automatically after
fault condition is removed. For more information about modems read chapter 6.3.
6.10 Push buttons
User interface of the meter contains two push buttons:
sealed push-button
and
scroll push-
button
and can have optical scroll key, which interprets pulses of light beam as LCD control
commands. Position of push-buttons depends on modification of meter cover, transparent or non-
transparent meters cover is used (see Figure 5-1 and Figure 5-2).
Meter with transparent cover have two additional push-buttons, sealed push-button which located
under changeable battery cover on the right side, and scroll push-button which located on the left
side.
Non-transparent meter cover possess sealable
multifunctional
(two-position)
push-button
on the
left side of main cover (see Figure 6-7).
Scroll push-button
(position A). In this position,
button can be pressed without removing seal.
Sealed push-button
(position B). In this position,
button can be pressed only after removing the seal.
There is possibility to seal button in position A so,
that switching to position B without removing of seal
is impossible.
Figure 6-7 Multifunctional (two-position) push-button
6.10.1 Scroll push button and optical scroll key
Scroll push button and optical scroll key are designed for data scrolling. The control is carried out
on the basis of three commands:
•
Short signal (scroll push-button is pressed for <2 seconds);
•
Long signal (scroll push-button is pressed for duration between 2 and 5 seconds);
•
Very long signal (scroll push-button is pressed for >5 seconds)
Read chapter 11 to find out more about data scrolling.
Optical scroll key is designated for the same function as scroll push button. It reacts on short and
long light signals. By means of optical scroll key, data can be scrolled on LCD without having
mechanical contact to meter.