Wilo Control EC-WP Series Installation And Operating Instructions Manual page 29

6.6.10 "Drain" control mode: 1x well,
2x pumps, 2x float switches or
electrodes
ON/OFF1
W1
DR
P1 P2
Fig. 37: Application diagram
1
6
4
4.3 4.2
Fig. 38: 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
ON/OFF1
ON/OFF2
DR
P1
ON/OFF2
P2
When the fill level in the well rises and the first switch on-level (ON/OFF1) 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 (ON/OFF2) is reached, the second pump switches on.
When the switch-off levels (ON/OFF1 and ON/OFF2) are reached, the pumps switch off after
the set switch-off delay has elapsed. The switching cycle is defined by the cable length of
the respective float switch. NOTICE! The base-load and peak-load pumps are cycled al-
ternately (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 -
25 26 27 28
1/(2)
closed −
Open −
Required menu settings
Switch-on/switch-off level 1
Switch-on/switch-off level 2
Dry-running level
Pump 1
Pump 2
ON/OFF1 -
29 30 31 32
off
on/(off)
1 2
1/(2)
closed −
Open −
4.1
4.2
4.3
- ON/OFF2 -
33 34 35 36 45 46
4-20 mA
In
off
on/(off)
2 2
− closed −
− Open −
en
DR
ON/OFF1
ON/OFF2
-
49 50
2
closed
Open
29