Emc-Correct Installation - Grundfos CUE Series Product Manual

Installation
Typical shaft
Pump type
power P2
Up to 10 Hp
SP, BM, BMB with
380 V motor and up
15 Hp and up
Up to 10 Hp
Other pumps, noise
reduction
15 Hp and up
Up to 10 Hp
Other pumps, higher
noise reduction
15 Hp and up
Pumps with 690 V
All
motor
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.
Connect 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.)
Mains cable, Motor cable,
unscreened screened
CUE
Fig. 41 Example of installation without filter
Motor cable,
Mains cable,
unscreened screened
CUE
Fig. 42 Example of installation with filter. The cable be-
tween the CUE and filter must be short
Sine-wave
dU/dt filter
filter
0-1000 ft
–
(0-300 m)
0-500 ft 500-1000 ft
(0-150 m) (150-300 m)
0-1000 ft
–
(0-300 m)
0-500 ft 500-1000 ft
(0-150 m) (150-300 m)
0-1000 ft
–
(0-300 m)
0-1000 ft
–
(0-300 m)
0-500 ft 500-1000 ft
(0-150 m) (150-300 m)
M
M
Filter

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
metal screen in applications without output filter.
• There are no special requirements to supply cables,
apart 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 minimize 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
results if the above guidelines for good practice are fol-
lowed.
Grundfos CUE
35