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6.8
Electrical connection
Installation and operating instructions Wilo-Atmos TERA-SCH
Installation and electrical connection
DANGER
Risk of fatal injury due to electrical current!
Improper conduct when carrying out electrical work can lead to death due to electric
shock!
• Only use an electrical installer approved by the local electricity supplier to make
the connection.
• Observe the locally applicable regulations.
• Before beginning work on the product, make sure that the pump and drive are
electrically isolated.
• Make sure that no one can turn on the power supply again before work is com-
pleted.
• Make sure that all energy sources can be isolated and locked. If the pump was
switched off by a protective device, it must be secured against switching back
on again until the error has been remedied.
• Electrical machines must always be earthed. Earthing must be appropriate for
the motor and meet the relevant standards and regulations. Earth terminals and
fixation elements must be dimensioned appropriately.
• Connection cables must never touch the piping, pump or motor housing.
• If it is possible for persons to come into contact with the pump or the pumped
fluid, the earthed connection must also be fitted with a residual current circuit
breaker.
• Observe the manufacturer's installation and operating instructions for the mo-
tor and accessories!
• During installation and connection work, observe the circuit diagram in the ter-
minal box!
CAUTION
Risk of property damage caused by improper electrical connection!
An inadequate mains design can lead to system failures and cable fires due to mains
overload! If the wrong voltage is applied, the pump can be damaged!
• Ensure that the current type and voltage of the mains connection correspond to
the specifications on the motor rating plate.
NOTICE
Three-phase motors are equipped with a thermistor depending on the manufac-
turer.
• Observe the wiring information in the terminal box.
• Observe the documentation from the manufacturer.
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Establish an electrical connection via a stationary mains connection cable.
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In order to ensure drip protection and strain relief on the cable connections, only
cables with a suitable outer diameter may be used and the cable feedthroughs must
be firmly screwed.
Cables must be bent off to form outlet loops near screwed connections to avoid the
accumulation of drip water.
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Unused cable feedthroughs should be sealed with the sealing plates provided, and
screwed tight.
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Reinstall any uninstalled safety devices, such as terminal box covers!
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Check the direction of rotation of the motor while commissioning!
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