8
3.4 Battery back-up functions
Systems with 2 levels (3 electrodes), page 97.
If a back-up battery for CU 213 (accessory for certain variants) is
installed, the following functions will be carried out if the normal
electricity supply to the LC 110 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 nor-
mal electricity supply to the LC 110 fails and a back-up battery is
connected:
= the indicator light is off.
= the indicator light is on.
= the indicator light is flashing.
3.5 Reset button and ON-OFF-AUTO selector switch
Systems with 2 levels (3 electrodes), page 97.
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
.
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1
The
reset button
is a push-button for manual resetting of alarm signals to
external
alarm devices and the built-in
buzzer (i.e.
not
for resetting of the alarm memory as this is reset by means of the ON-OFF-AUTO selector switch,
see position OFF
( )).
Even if the fault condition still exists, the
external
alarm devices and the built-in buzzer will be reset when the reset
button is pressed.
The
ON-OFF-AUTO selector switch
has three different positions:
ON ( )
, top position:
• The pump will start when the selector switch is pushed into this position (unless the motor protection relay has cut
out the pump).
• If the motor thermal switch registers overtemperature, the pump will be switched off.
In explosion hazard areas, switch 10 of the DIP switch
must
be set as stated in section
. Consequently, the
pump
cannot
be started when the motor thermal switch registers overtemperature.
OFF (
)
, middle position:
• The pump
cannot
start when the selector switch has been set to this position.
• The alarm memory is reset by pushing the selector switch into position OFF
( ). The alarm memory is the light in-
dication of a fault condition which has disappeared. If a fault condition still exists when the selector switch is
pushed into position ON ( ) or AUTO ( ), the alarm indication will be repeated immediately.
AUTO (
)
, bottom position:
• The pump is controlled by the input signals from the electrodes and the pump according to the selected DIP switch
setting.
• Alarm signals will automatically be reset. Switch 9 of the DIP switch can, however, be set to manual resetting
which is carried out by means of the reset button, see section
.
• The pump will restart automatically when a given fault condition disappears. However, this is dependent on the
setting of switch 10 of the DIP switch, see section
.
• When the pump starts automatically after a fault condition which has disappeared, the indicator light will continue
to show the fault condition (alarm memory) and the indication can only be removed by resetting the alarm memory,
see position OFF
( ).
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