Grundfos motors
All three-phase Grundfos motors from frame size 90
and up can be connected to a frequency converter.
The connection of a frequency converter will often
have the effect that the motor insulation system is
loaded more and that the motor will be more noisy
than during normal operation. In addition, large
motors are more at risk of being loaded with bearing
currents caused by the frequency converter.
Check these operating conditions if the pump is
driven via a frequency converter:
Operating conditions Action
2-pole motors from 45
kW, 4-pole motors from
37 kW and 6-pole motors
from 30 kW
Check that one of the
motor bearings is
electrically isolated.
Contact Grundfos.
Noise critical applications
Fit an output filter
between the motor and
the frequency converter;
this reduces the voltage
peaks and thus the
noise.
Particularly noise critical
applications
Fit a sinusoidal filter.
Cable length
Fit a cable that meets the
specifications laid down
by the frequency
converter supplier. The
length of the cable
between motor and
frequency converter
affects the motor load.
Supply voltage up to 500
V
Check that the motor is
suitable for frequency
converter operation.
Supply voltage between
500 V and 690 V
Fit a sinusoidal filter
between the motor and
the frequency converter
which reduces the
voltage peaks and thus
the noise, or check that
the motor has reinforced
insulation.
Supply voltage of 690 V
and higher
Fit a sinusoidal filter and
check that the motor has
reinforced insulation.
Grundfos MG motors do not have
reinforced insulation. When it comes to
reinforced insulation, other motors
supplies are able to supply such motors as
FPV variants.
Other motor makes than Grundfos
Contact Grundfos or the motor manufacturer.
4.4.3
Synchronous motors
Pumps fitted with synchronous motors must be
connected to a Grundfos CUE frequency converter.
TM044289
Example of installation without filter
Symbol Designation
1 CUE
4 Standard motor
One line Unscreened cable
Double line Screened cable
Synchronous motors must not be
connected directly to mains supply.
The CUE must be of T/C CUE203 followed by
additional numbers and characters. See the CUE
Installation and operating instruction to setup
frequency driver together with synchronous motor.
If another frequency driver brand other than CUE is
required or specified, contact Grundfos.
T/C: CUE203 P1M2T5E20H1BXCXXXSXXXXAXBXCXXXXDX
IN: 3x380-500 V 50/60Hz 3.7A
OUT: 3x0-Vin 0-100Hz 4.1 A 2.8 kVA
CHASSIS/IP20 Tamb. 45C/122F
IIIIIIIIIIIBAR CODEIIIIIIIIIII
Listed 76X1 E134261 Ind. Contr. Eq.
STORED CHARGE DO NOT TOUCH UNTIL
TM077181
Example of CUE nameplate
Text Description
T/C
CUE: product name
203... :internal code
17
English (GB)
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