Grundfos CU 362 Instrucciones De Instalación Y Funcionamiento página 14

5.3 Float switches
The CU 362 has a set of factory settings for the float switches. The
functions of the float switches depend on the number of pumps and
float switches installed.
If more than two pumps are installed, only two float switches can be
used, and they are used as safety high-level and/or dry-running
float switches.
Float switches
High-level, overflow and dry-running float switches
In the pit, the high-level float switch must be physically installed
above the level indicated as high level, otherwise "Conflicting
levels" and "Level sensor" alarms will be triggered. See fig.
level and dry-running float switches.
The overflow switch must be physically installed at the same height
as the bottom of the overflow channel. The overflow switch works in
coorporation with an analog level sensor. See fig.
dry-running float switches.
The dry-running float switch must be physically installed below the
level indicated as dry-running level, otherwise "Conflicting levels"
and "Level sensor" alarms will be triggered. See fig.
dry-running float switches.
The alarms "Conflicting levels" and "Level sensor" will
only be triggered if an analog level sensor is installed. The
analog level sensor is not shown in fig.
running float switches.
When the high-level float switch is activated, it triggers a high-level
alarm. All pumps will start at the same time, but the number of
starting pumps depends on the number of pumps in each pump
group.
The overflow switch activates the overflow calculation, and the
analog level sensor registers the actual level in the overflow
channel.
For further information about pump groups and overflow calculation,
see Dedicated Controls, Software description installation and
operating instructions.
14
High-level and dry-running float switches
Pos.
1
High-
2
3
High-level and 4
High-level and
High-level and dry-
Description
Installation point
High level
Installation point
Dry running
1
2
3
4