8.1.4.6 Drain function, two pumps and five float switches
TM077567
Display: drain function, two pumps and five float switches
TM028301
Drain function, two pumps and five float switches
Float switch
Configuration
1
2
3
4
5
6
7
8
4
High level
High level
Start 2
Start 2
Start 2
Start 2
Start 2
Start 2
3
Start 2
Start 2
Alarm
Alarm
Start 1
Start 1
Start 1
Stop 2
2
Start 1/stop
Start 1
Start 1
Start 1/stop
Stop
Stop 2
Stop 1
Start 1/stop
1
Dry running
Stop
Stop
Dry running
Dry running
Stop 1
Stop 2
Dry running
8.1.4.7 Analog sensor with safety float switches
This display allows the user to set the stop and start levels for the
pumps in the system as well as the overflow level, high level, dry-
running level and foam-draining level.
If the "Start level variation" function is enabled, "Start level
1" is shown in this display.
See section about start level variation.
If alternation is disabled, the pumps are numbered according to
their position. "Start level 1" and "Stop level 1" apply to the pump
connected as number 1 in the system.
In connection with alternation, this one-to-one rule does not apply.
This means that the lowest level always starts one pump and the
next level starts the other pump.
In connection with alternation, the number of operating hours is
distributed equally between the two pumps.
The system ensures that the below rules are observed by
automatically adjusting the other levels accordingly:
•
The alarm level must be higher than the lowest start level and
lower than high level.
•
The pump start level must always be higher than the stop level
of the same pump.
•
The dry-running level is always lower than the lowest stop level.
At the overflow level, the water runs over the edge of the pit or into
an overflow channel. The overflow level typically lies between the
highest start level and the edge of the pit.
If, in addition to the level sensor, the system incorporates a high-
level float switch and/or a dry-running float switch, this must be
selected. See section about float switch functions.
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 are triggered.
The dry-running float switch must be physically installed below the
level indicated as dry-running level, otherwise "Conflicting levels"
and "Level sensor" alarms are triggered.
When the high-level float switch is activated, it triggers a high-level
alarm. All pumps start, but the number of starting pumps depends
on the number of pumps in each pump group.
For the purpose of emergency operation in the event of a defective
sensor, the time from the deactivation of the high-level float switch
to the stopping of the pumps can be set. The length of this time is
best found by trial and error, as it depends on the actual amount of
water the pumps are capable of moving. See section about pump
delays.
Path:
Settings > Basic functions > Float switch function >
TM077564
Float switch function
TM042956
Float switch function
29
English (GB)
