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Installation and operating instructions • Drive for Wilo-Helix2.0-VE / Wilo-Medana CH3-LE • Ed.01/2022-06
59
Double pump
Ext. OFF function
System mode
Single pump mode
Combined mode
Behaviour at Ext. OFF for double pumps
The function Ext. OFF always behaves as follows:
Ext. OFF active: Contact is open, pump is stopped (off)
Ext. OFF inactive: Contact is closed, pump is running in the control mode (on)
The double pump consists of two partners:
Main pump: double pump partner with connected pressure sensor Partner pump: double
pump partner without connected pressure sensor The configuration of the control inputs has
three possible adjustable modes at Ext. OFF that can influence the behaviour of the two
pump partners accordingly.
The possible behaviours are described in the following tables:
System mode
The control input of the main pump is connected with a control cable and on Ext. OFF. The
control input on the main pump switches both double pump partners. The control input of
the partner pump is ignored and has no meaning regardless of its configuration. If the main
pump fails or the double pump connection is interrupted, the partner pump is also stopped.
Main pump
Partner pump
States
Ext. OFF
Pump motor
behaviour
Display:
Text at Active
influences
Ext. OFF
Pump motor
behaviour
Display:
Text at Active
influences
1
Active
Off
OFF
Override
OFF (DI1
Active
Off
OFF
Override
OFF (DI1
2
Not active
On
OK Normal op-
eration
Active
On
OK Normal op-
eration
3
Active
Off
OFF
Override
OFF (DI1
Not active
Off
OFF
Override
OFF (DI1
4
Not active
On
OK Normal op-
eration
Not active
On
OK Normal op-
eration
Single mode
The control input of the main pump and the control input of the partner pump are each as-
signed a control cable and are each configured on Ext. OFF. Each of the two pumps is indi-
vidually switched by its own control input. If the main pump fails or the double pump con-
nection is interrupted, the control input of the partner pump is evaluated. Alternatively, a
cable bridge can be set at the partner pump instead of a separate control cable.
Main pump
Partner pump
States
Ext. OFF
Pump motor
behaviour
Display:
Text at Active
influences
Ext. OFF
Pump motor
behaviour
Display:
Text at Active
influences
1
Active
Off
OFF
Override
OFF (DI1)
Active
Off
OFF
Override
OFF (DI1)
2
Not active
On
OK Normal op-
eration
Active
Off
OFF
Override
OFF (DI1)
Содержание Helix2.0-VE
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