Installation and electrical connection
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Installation and operating instructions Wilo-Padus PRO
17
6.5
Electrical connection
DANGER
Risk of death due to electrocution!
Improper conduct when carrying out electrical work can lead to death due to electric
shock! Electrical work must be carried out by a qualified electrician in accordance
with the locally applicable regulations.
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The mains connection must match the specifications on the rating plate.
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Power supply on mains side for three-phase current motors with clockwise rotating
field.
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Lay the connection cable in accordance with the locally applicable regulations and
connect it according to the wire assignment.
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Connect the monitoring devices and check their function.
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Earth the device properly in accordance with applicable local regulations.
6.5.1
Fuse on mains side
Circuit breaker
The size and switching characteristics of the circuit breakers must conform to the rated
current of the connected product. Observe local regulations.
Motor protection switch
Make provision for an on-site motor protection switch for devices without a plug! The
minimum requirement is a thermal relay/motor protection switch with temperature
compensation, differential triggering and anti-reactivation device in accordance with
the local regulations. In case of sensitive mains, make provision for the installation on-
site of other protective equipment (e.g. overvoltage, undervoltage or phase failure re-
lay, etc.).
Residual-current device (RCD)
Comply with the regulations of the local energy supply company! The use of a residual-
current device is recommended.
If persons come into contact with the device and conductive fluids, secure the connec-
tion
with
a residual-current device (RCD).
6.5.2
Maintenance tasks
Check the insulation resistance of the motor winding before installation. If the meas-
ured values differ from the specifications, moisture may have penetrated into the mo-
tor or the connection cable. Contact customer service in the event of a fault.
6.5.2.1
Checking the insulation resistance
of the motor winding
Use an insulation tester to measure the insulation resistance (measuring
voltage = 1000 V). Observe the following values:
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At the time of initial commissioning: Insulation resistance may not be less than
20 MΩ.
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For further measurements: Value must be greater than 2 MΩ.
NOTICE! For motors with an integrated capacitor, short-circuit the windings prior to
checking!
6.5.3
Three-phase current motor con-
nection
NOTICE! A clockwise rotating field must be available to allow the correct direction
of rotation.
NOTICE! The individual wires are identified according to the connection diagram. Do
not cut the wires! There is no further relationship between the wiring diagram and
the connection diagram.
