Wilo Control EC-WP Series Installation And Operating Instructions Manual page 31

6.6.12 "Drain" control mode: 1x well,
2x pumps, 4x float switches or
electrodes
ON1
W1
OFF1
DR
P1 P2
Fig. 41: Application diagram
1
6
4
4.5 4.4 4.3 4.2
Fig. 42: Screen display
Function
Terminal overview symbol
Float switch operating principle
Top contact
Bottom contact
Menu and value to be set
Installation and operating instructions • Wilo-Control EC-WP • Ed.01/2024-08
ON1
OFF1
ON2
OFF2
ON2
DR
P1
OFF2
P2
When the fill level in the well rises and the first switch on-level (ON1) is reached, the first
pump switches on. The well is drained. When the water level in the well continues to rise and
the second switch on-level (ON2) is reached, the second pump switches on.
When the switch-off levels (OFF1 and OFF2) are reached, the respective pump switches off
after the set switch-off delay has elapsed. NOTICE! The base-load and peak-load pumps
are cycled alternately (see menu 5.60).
To protect the pumps from a dry run, install an additional float switch or electrode in the well:
• If the water level falls below the dry-running level, the pumps switch off. An error mes-
sage appears on the display and an alarm sounds.
• If the dry-running level is exceeded, the alarm and error message are automatically reset.
1 Current pump status
2
2 Standby pump activated
3 Control mode
3
4 Switching status of the float switch/electrode
6 Fieldbus active
4.1
Overview of terminals
DR OFF1
25 26 27 28
1/(2)
closed closed
Open Open
Required menu settings
Switch-on level 1
Switch-off level 1
Switch-on level 2
Switch-off level 2
Dry-running level
Pump 1
Pump 2
ON1 -
29 30 31 32
off
on/(off)
1 2
1/(2)
closed −
Open −
4.1
4.2
4.3
4.4
4.5
OFF2 ON2 -
33 34 35 36 45 46
4-20 mA
In
off
on/(off)
2 2
closed closed −
Open Open −
en
DR
OFF1
ON1
OFF2
ON2
-
49 50
2
closed
Open
31