Wilo -Padus PRO M08L/T039-540/A Einbau- Und Betriebsanleitung Seite 45

6.5.1 Fuse on mains side
6.5.2 Maintenance tasks
6.5.2.1 Checking the insulation resistance
of the motor winding
6.5.3 Three-phase current motor con-
nection
PE U V
M 3~
Fig. 4: Connection diagram for three-phase
current motor without plug and float switch
Installation and operating instructions Wilo-Padus PRO
Installation and electrical connection
▪ Earth the device properly in accordance with applicable local regulations.
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).
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.
Use an insulation tester to measure the insulation resistance (measuring
voltage = 1000 V). Observe the following values:
▪ At the time of initial commissioning: Insulation resistance may not be less than 20 MΩ.
▪ For further measurements: Value must be greater than 2 MΩ.
NOTICE! For motors with an integrated capacitor, short-circuit the windings prior to
checking!
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.
Standard version without plug and float switch
W
Wire colour
Grey (gy)
Black (bk)
Brown (bn)
Green/yellow (gn-ye)
The connection cable features bare cable ends. Connection to the mains is established
by connecting the connection cable in the switchgear. Electrical connection must al-
ways be carried out by a qualified electrician!
Designation Terminal
U L1
V L2
W L3
Earth PE
en
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