Wilo Yonos MAXO Series Installation And Operating Instructions Manual page 21

Signal lamps and sig- Status
nals
open
Collective run signal
contact
closed
Collective run signal
contact
open
Collective fault signal
contact
Collective fault signal closed
contact
6.3 Twin-head pump operation
NOTICE
Install a Wilo-Connect module for each of the two
pumps.
Installation and operating instructions Wilo-Connect Modul Yonos MAXO
Meaning
ƒ
No mains voltage.
ƒ
Control input "Ext. Off"
open.
ƒ
A fault has occurred.
ƒ
Standby pump (only for
twin-head pump opera-
tion).
ƒ
Pump pumping, there is
no fault.
ƒ
Master pump on standby
(standby; only for twin-
head pump operation).
A fault has occurred: Pump
not running/pump faulty.
Twin-head pumps only: One
or both participants of the
twin-head pump is/are
faulty.
There is no fault.
Integrated dual pump management with the functions:
ƒ
Main/standby operation with running time-dependent (24 h)
switchover of main and standby pump.
Both pumps run simultaneously at the time of pump switchover
so that operation is not interrupted. Inadequate supply for ex-
ample in cooling/air-conditioning system is therefore avoided.
ƒ
Fault-sensitive switchover to operational standby pump.
In case of a fault with the running pump, the system switches
over to the standby pump after approx. 3 s.
The DIP switch 1 defines which pump is the master pump (MA) ➜
Fig. 8.
"Ext. Off" of the standby pump must be closed (bridge if required).
NOTICE
The external control command "Ext. Off" interrupts
the running time counter of the switchover function.
7 Installation and electrical connection
ƒ
Electrical work: Electrical work must be performed by a qualified
electrician.
en
21