5.1 Drive-end motor bearing
Make sure to use the correct type of drive-end
(DE) motor bearing for the bare-shaft pump.
Please check the specific pump range and pump
version stated on the nameplate and select the
corresponding DE bearing.
DE bearing
CR 1-64 pump range
DE bearing
CR 95-255 pump range
Pump version
Deep-groove
ball bearing
(62/63xx)
Angular contact
bearing
(73xx)
Deep-groove ball
bearing
(62/63xx)
Angular contact
bearing
(73xx)
A Standard pump
0.33 - 10 HP
15-60 HP
100-300 HP
15-75 HP
T
Pump with thrust
handling device
(THD)
-
-
-
Not allowed
Z
Pump with
bearing flange
0.33 - 60 HP
Not allowed
15-300 HP
Not allowed
1)
Refer to the codes for pump version in the section on the type key.
2)
Factory product variants (FPV).
Related information
5.2 CRN 95, 125, 155 high-pressure
range
The pump sizes listed below are only
to be used with soft starter or
frequency converter.
CRN 95-6-3
CRN 125-7
CRN 155-5
CRN 95-6
CRN 125-8-2
CRN 155-6-2
CRN 95-7-2
CRN 125-8
CRN 155-6
CRN 95-7
CRN 125-9-3
CRN 155-7-2
CRN 95-8-2
CRN 155-7
CRN 95-8
CRN 155-8-3
5.3 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: ≥ 60 HP (45 kW)
•
4-pole motors: ≥ 50 HP (37 kW)
Some installations may require
protection at lower motor power due to
either insufficient grounding, liquid
influencing the grounding of the motor,
or the combination of motor brand and
frequency converter.
5.4 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.
14
English (US)
