Control Panel; Battery Back-Up Functions - Grundfos LC 108 Installation And Operating Instructions Manual

5.3 Control panel

3 float switches, pages 189 and 190.
Figure 10 shows the control panel of the CU 211 module.
1
CU 211
1
12
11
10
9
8
7
Fig. 10
Key to the symbols in fig. 10:
Pos. Description
Green indicator light, indicating starting delay (flashing)
1
and pump operation (permanently on).
Red indicator light, indicating pump fault.
2 Flashing: Fault in PTC resistor/thermal switch.
On: Fault in motor-protective circuit breaker.
Red indicator light, indicating wrong phase sequence
3
(only certain variants and three-phase pumps only).
4 Red indicator light, indicating common alarm.
ON-OFF-AUTO selector switch, three positions,
5
see section 5.5.
Reset button, push-button for manual resetting of alarm
7 signals to external alarm devices and the built-in buzzer
(only certain variants), see section 5.5.
Orange indicator light, which is activated by the float
8
switch for stop of pump.
Orange indicator light, which is activated by the float
9
switch for start of pump.
2 orange indicator lights, which are activated by the float
10
switch for high-level alarm.
and
In case of high-level alarm, the top indicator light is
11
flashing and the other indicator light is permanently on.
Green indicator light, indicating that the electricity
12
supply has been switched on.
2 3 4 5
1

5.4 Battery back-up functions

3 float switches, pages 189 and 190.
If a back-up battery for CU 211 (accessory for certain variants) is
installed, the following functions will be carried out if the normal
electricity supply to the LC 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 5.2.
The table below shows the situations which may occur if the
normal electricity supply to the LC 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:
CU 211
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.
CU 211
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.
15