Installation
Grundfos CUE
35
The lengths stated apply to the motor cable.
Motor cable
Use a shielded/armored motor cable to comply with
EMC emission specifications (or install the cable in a
metal conduit). Keep the motor cable as short as possi-
ble to reduce the noise level and leakage currents.
C
onnect the motor cable shield/armor to both the
decoupling plate of the adjustable frequency drive and
to the metal of the motor. (Same applies to both ends of
the metal conduit if used instead of a shield.)
Fig. 41 Example of installation without filter
Fig. 42 Example of installation with filter. The cable be-
tween the CUE and filter must be short
EMC-correct installation
This section gives guidelines for good practice when
installing the CUE. Follow these guidelines to meet EN
61800-3, first environment.
• Use only motor and signal cables with a braided
m
etal screen in applications without output filter.
• There are no special requirements to supply cables,
ap
art from local requirements.
• Leave the screen as close to the connecting termi-
nals as possible. See fig. 43.
• Avoid terminating the screen by twisting the ends.
See fig.
44. Use cable clamps or EMC screwed ca-
ble entries instead.
• Connect the screen to frame at both ends for both
motor and signal cables. See fig. 45. If the controller
has no cable clamps, connect only the screen to the
CUE. See fig. 46.
• Avoid unscreened motor and signal cables in elec-
trical cabinets with frequency converters.
• Make the motor cable as short as possible in appli-
cations without output filter to limit the noise level
and mini
mize leakage currents.
• Screws for frame connections must always be tight-
ened whether a cable is connected or not.
• Keep main cables, motor cables and signal cables
separated in the installation, if possible.
Other installation methods may give similar EMC
r
esults if the above guidelines for good practice are fol-
lowed.
Pump type
Typical shaft
power P2
dU/dt filter
Sine-wave
filter
SP, BM, BMB with
380 V motor and up
Up to 10 Hp
–
0-1000 ft
(0-300 m)
15 Hp and up
0-500 ft
(0-150 m)
500-1000 ft
(150-300 m)
Other pumps, noise
reduction
Up to 10 Hp
–
0-1000 ft
(0-300 m)
15 Hp and up
0-500 ft
(0-150 m)
500-1000 ft
(150-300 m)
Other pumps, higher
noise reduction
Up to 10 Hp
–
0-1000 ft
(0-300 m)
15 Hp and up
–
0-1000 ft
(0-300 m)
Pumps with 690 V
motor
All
0-500 ft
(0-150 m)
500-1000 ft
(150-300 m)
TM03 8802 2507TM03 8803 2507
CUE
Mains cable,
unscreened
Motor cable,
screened
M
CUE
Filter
Mains cable,
unscreened
Motor cable,
screened
M
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