Connection Options; Twin-Head Pumps - Wilo Yonos MAXO Notice De Montage Et De Mise En Service

that the voltage between the live wires (L1-L2, L2-L3, L3-L1
➜ Fig. 12C) does not exceed 230 V.
In case of error (ground fault), the voltage between the live
wire and PE must not exceed 230 V.
ƒ
During external connection of the pump deactivate a pulse of
the voltage (for example phase angle control).
ƒ
Switching the pump via triacs/solid-state relays must be ex-
amined on a case-by-case basis.
ƒ
During deactivation with on-site power relay: Rated current
≥ 10 A, rated voltage 250 V AC
ƒ
Observe the switching frequency:
– Switch-on/off procedures via mains voltage ≤ 100/24 h
– ≤ 20/h for a switching frequency of 1 min. between switch-
ing on/off via mains voltage
ƒ
If a residual-current device (RCD) is used, it is recommended to
use an RCD type A (pulse current sensitive). Check that the
rules for the coordination of electrical equipment in the elec-
trical installation are observed and, if necessary, adjust the RCD
accordingly.
ƒ
Observe leakage current I
ƒ
The electrical connection must be made via a fixed connecting
cable equipped with a connector device or an all-pole switch
Installation and operating instructions Wilo-Yonos MAXO /-D/-Z
≤ 3.5 mA for each pump.
eff
with a contact opening width of at least 3 mm (VDE 0700/
Part 1).
ƒ
To protect against leakage and for strain relief to the threaded
cable gland, use a connecting cable with sufficient outer dia-
meter ➜ Fig. 15.
ƒ
Use a heat-resistant connecting cable for fluid temperatures
exceeding 90 °C.
ƒ
Lay the connecting cable in such a way that it does not make
contact with the pipes or the pump.
6.3

Connection options

➜ Fig. 12
NOTICE
3~ 400 V without neutral conductor N: Upstream
mains transformer.
6.4

Twin-head pumps

Only operate as main and standby pump with automatic fault-actu-
ated switchover:
1. Individually connect and secure both motors.
2. Provide separate switchgear.
3. Make the identical settings.
en
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