Connection Options; Twin-Head Pumps - Wilo Yonos MAXO Instrucciones De Instalación Y Funcionamiento

• Observe the current type and voltage on the rating plate.
• Connect to 230 V low-voltage networks. When connecting to IT networks (Isolé Terre electrical system), al-
ways make sure that the voltage between the live wires (L1-L2, L2-L3, L3-L1 ➜ Fig. 3) does not exceed
230 V.
In case of error (earth fault), the voltage between the live wire and PE must not exceed 230 V.
• During external connection of the pump, deactivate a pulse of the voltage (for example phase angle con-
trol).
• Switching the pump via triacs/solid-state relays must be examined on a case-by-case basis.
• During deactivation with on-site power relay: Rated current ≥ 10 A, rated voltage 250 V AC
• Observe the switching frequency:
– Switch-on/off procedures via mains voltage ≤ 100/24 h
– ≤ 20/h for a switching frequency of 1 min. between switching on/off via mains voltage
• 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 electrical installation are observed
and, if necessary, adjust the RCD accordingly.
• Observe leakage current I
• The electrical connection must be made via a fixed connecting cable equipped with a connector device or an
all-pole switch with a contact opening width of at least 3 mm (VDE 0700/Part 1).
• To protect against leakage and for strain relief to the threaded cable gland, use a connection pipe with suf-
ficient outer diameter (see chapter "Connecting").
• Use a heat-resistant connecting cable for fluid temperatures exceeding 90 °C.
• Lay the connecting cable in such a way that it does not make contact with the pipes or the pump.
7.2

Connection options

Fig. 3: Connection options
The pump can be connected to power supplies with the following voltage ratings:
• 1~ 230 V
• 3~ 400 V with neutral conductor
• 3~ 400 V without neutral conductor (upstream mains transformer)
• 3~ 230 V
7.3

Twin-head pumps

Only operate as main and standby pump with automatic fault-actuated switchover:
Installation and operating instructions • Wilo-Yonos MAXO/-D/-Z • Ed.01/2022-08
≤ 3.5 mA for each pump.
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