Battery Back-Up Functions; Reset Button And On-Off-Auto Selector Switch - Grundfos LC 110 Montage- Und Betriebsanleitung

5.4 Battery back-up functions

Systems with 3 levels (4 electrodes), page 262.
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 5.2.

5.5 Reset button and ON-OFF-AUTO selector switch

Systems with 3 levels (4 electrodes), page 262.
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 5.2. Consequently,
the pump cannot be started when the motor thermal switch registers overtemperature.
OFF ( )
• The pump cannot start when the selector switch has been set to this position.
1
• The alarm memory is reset by pushing the selector switch into position OFF ( ). The alarm memory is the light
indication 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 ( )
• 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 5.2.
• 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 5.2.
• 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 ( ).
12
, middle position:
, bottom position:
The table below shows the situations which may occur if the
normal 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.
Mains supply failure:
1
• 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.
1
• 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.