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Preparation/notes
Installation and operating instructions • Wilo-Atmos GIGA-I/-D/-B • Ed.01/2023-08
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.
•
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).
•
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.
•
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.
•
Lay the connection cable in such a way that it touches neither the pipes nor the pump.
•
Use a heat-resistant connection cable if fluid temperatures exceed 90 °C.
•
The current type and voltage of the mains connection must correspond to the specifica-
tions on the rating plate.
•
Fuse protection on mains side: Dependent on rated motor current.
•
When connecting an external frequency converter, observe the corresponding installation
and operating instructions! If necessary, carry out additional earthing due to higher leak-
age currents.
•
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 frequency
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 frequency
converters, WILO SE does not guarantee fault-free use of the motors on third-party convert-
ers.
500 V/690 V power supply
The motors which Wilo uses as standard for glanded pumps are not suited to be used on ex-
ternal frequency converters with 500 V/690 V.
For use in 500 V or 690 V mains, motors with appropriate winding and reinforced insulation
system are available. This must be explicitly stated when ordering. The overall installation
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:
•
Observe the installation notes of the frequency converter manufacturer.
•
Observe the rise times and peak voltages depending on the cable length in the respective
installation and operating instructions of the frequency converter.
•
Use an appropriate cable with a sufficient cross-section (max. 5 % voltage loss).
•
Connect the correct shielding according to the recommendation of the frequency con-
verter manufacturer.
•
Lay the data cables (e.g. PTC analysis) separately from the mains cable.
•
If necessary, use a sine filter (LC) in consultation with the frequency converter manufac-
turer.
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