Wilo Atmos GIGA-I Einbau- Und Betriebsanleitung Seite 58

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Preparation/notes
58
Electrical connection
CAUTION
Material damage due to improper electrical connection!
An inadequate mains design can lead to system failures and cable fires
due to mains overload!
• When designing the mains supply with regard to the used cable cross-sections
and fuses, pay special attention to the fact that, in multi-pump operation, it is
possible that all pumps operate at the same time for short periods.
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Establish electrical connection via a fixed connection cable with a connector device
or an all-pole switch with at least 3 mm contact opening width (VDE 0730/Part 1).
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To protect against leakage water and for strain relief to the threaded cable gland,
use a connection cable with sufficient outer diameter and screw them so they are
tight enough.
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The cables near the screwed connection are to be bent to form a drain loop, to
drain any accumulated drips.
Position the threaded cable gland and, by laying the cables accordingly, ensure that
no drips are able to run into the terminal box. Unoccupied threaded cable glands
must remain closed with the plugs provided by the manufacturer.
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Lay the connection cable in such a way that it touches neither the pipes nor the
pump.
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Use a heat-resistant connection cable if fluid temperatures exceed 90 °C.
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The current type and voltage of the mains connection must correspond to the spe-
cifications on the rating plate.
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Fuse protection on mains side: Dependent on rated motor current.
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When connecting an external frequency converter, observe the corresponding in-
stallation and operating instructions! If necessary, carry out additional earthing due
to higher leakage currents.
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The motor must be secured against overloading by a motor protection switch or by
the PTC thermistor tripping unit (accessory).
Standard pumps on external frequency converters
If standard pumps are used on external frequency converters, the following aspects
have to be considered regarding the insulation system and current-insulated bearings:
400 V power supply
The motors used by Wilo for glanded pumps are suitable for operation on external fre-
quency converters.
It is strongly recommended to set up and operate the installation in compliance with
IEC TS 60034-25:2014. Due to the rapidly advancing development in the field of fre-
quency converters, WILO SE does not guarantee fault-free use of the motors on third-
party converters.
500 V/690 V power supply
The motors which Wilo uses as standard for glanded pumps are not suited to be used on
external frequency converters with 500 V/690 V.
For use in 500 V or 690 V mains, motors with appropriate winding and reinforced insu-
lation system are available. This must be explicitly stated when ordering. The overall in-
stallation must comply with IEC TS 60034-25:2014.
Current-insulated bearings
Due to increasingly fast switching processes of the frequency converter, drops in
voltage can occur across the motor bearing even with motors of lower power. In case of
premature breakdown due to bearing current, use current-insulated bearings!
Always observe the following instructions when connecting the frequency converter to
the motor:
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Observe the installation notes of the frequency converter manufacturer.
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Observe the rise times and peak voltages depending on the cable length in the re-
spective installation and operating instructions of the frequency converter.
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Use an appropriate cable with a sufficient cross-section (max. 5 % voltage loss).
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Connect the correct shielding according to the recommendation of the frequency
converter manufacturer.
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Lay the data cables (e.g. PTC analysis) separately from the mains cable.
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If necessary, use a sine filter (LC) in consultation with the frequency converter
manufacturer.
WILO SE 2022-06