3.1.3 CRN 95, 125, 155 high-pressure range
The pump sizes listed below are only to be
used with soft starter or frequency convert-
er.
50 Hz
60 Hz
CRN 95-8
CRN 95-5
CRN 95-9
CRN 95-6-1
CRN 95-10
CRN 95-7
CRN 95-11
CRN 125-7
CRN 95-12
CRN 125-8
CRN 125-11
CRN 125-9-3
CRN 125-12
CRN 155-5
CRN 155-8
CRN 155-6-3
CRN 155-9
CRN 155-6
CRN 155-10
CRN 155-7-3
CRN 155-11-1
CRN 155-7
-
CRN 155-8-3
3.1.4 Motors for Variable Frequency Drive (VFD)
To avoid bearing current when operating the pump
with VFD, Grundfos recommends using an isolated
bearing system for the following motor sizes:
•
2-pole motors: ≥45 kW
•
4-pole motors: ≥37 kW
Some installations may require protection
at lower motor power due to either insuffi-
cient grounding, liquid influencing the
grounding of the motor, or the combination
of motor brand and frequency converter.
3.1.5 Installation guidelines
The pump must be secured to a horizontal, plane and
solid foundation with bolts through the holes in the
base plate. When installing the pump, be aware of the
information below in order to avoid damaging the
pump.
12
English (GB)
Summary of Contents for CRN 125-11
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