11
4.4 Battery back-up functions
Parallel operation with 4 float switches, pages 25 and 26.
If a back-up battery for CU 212 (accessory for certain variants) is
installed, the following functions will be carried out if the normal
electricity supply to the LCD 108 fails (see also the illustrations
below):
• The common alarm is active, the
red
indicator light is on –
cannot
be reset!
•
If
the
external
alarm device for common alarm is supplied from
an external power source, this device will be active –
cannot
be reset by means of the reset button!
• The built-in buzzer (only certain variants) is activated – can be
reset by means of the reset button!
•
If
the liquid level in the pit rises above the level for high-level
alarm, the top
orange
indicator light will be
flashing
and the
second
orange
indicator light from the top will be permanently
on.
•
If
the starting delay function and automatic test run were
selected (switch 4 of the DIP switch), the start-up will be
delayed after the electricity supply has been switched on when
the liquid level is sufficiently high, see section
.
The table below shows the situations which may occur if the
normal electricity supply to the LCD 108 fails and a back-up
battery is connected:
= the indicator light is off.
= the indicator light is on.
= the indicator light is flashing.
Mains supply failure:
• The common alarm is active.
The
red
indicator light is on.
• The green indicator light (electricity
supply switched on) is
off
.
Mains supply failure
and
high-level alarm:
• The common alarm is active.
The
red
indicator light is on.
• The top
orange
indicator light is
flashing
.
• The second
orange
indicator light from
the top is on.
• The green indicator light (electricity
supply switched on) is
off
.
1
CU 212
2
CU 212
2
1