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26 Installation and operating instructions • Wilo-Yonos MAXO/-D/-Z • Ed.01/2022-08
• 3~400V with neutral conductor
• 3~ 400V without neutral conductor (upstream mains transformer)
• 3~230V
7.3 Twin-head pumps
Only operate as main and standby pump with automatic fault-actuated switchover:
1. Individually connect and secure both motors.
2. Provide separate switchgear (e.g.,: Wilo-Connect module Yonos MAXO (accessories)).
3. Make identical settings.
7.4 Collective fault signal (SSM)
The contact of the collective fault signal (potential-free normally closed contact) can be connected to a build-
ing automation system. Internal contact is closed in the following cases:
• The pump has zero current.
• There is no fault.
• The control module has failed.
DANGER
Risk of fatal electrical shock!
Danger to life through voltage transmission, if mains and SSM pipe are led together through a
5-wire cable.
• Do not connect SSM pipe to protective low voltage.
Connection values
• Permitted minimum: 12VDC, 10mA
• Permitted maximum: 250VAC, 1A, AC1
During connection of the SSM pipe to the network potential:
• SSM phase = live wireL1
7.5 Connect
DANGER
Risk of fatal electrical shock!
Immediate risk of fatal injury if live components are touched.
• Electrical connection may only be carried out by a qualified electrician and in accordance
with the applicable regulations!
• Before commencing work, switch off the power supply and secure it from being switched
on again.
1. Prepare the cable as indicated in the Figure (Fig.X).
2. Unscrew the screw from the plug (Fig.XI).
3. Remove the plug.
4. Unscrew cable ducts (Fig.XII).
5. Flip open the plug.
6. Remove the elastic fastener from the cable ducts using a small screwdriver (Fig.XIII).
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