Maintenance And Service; Cleaning Of The Motor; Relubrication Of Motor Bearings; Replacement Of Motor Bearings - Grundfos CRE Montage- Und Betriebsanleitung

4. Insulate the three conductors from each other by means of
insulating tape or the like.
Warning
Do not bypass the frequency converter by connecting
the mains conductors to the U, V and W terminals.
This may cause hazardous situations for personnel
as the high voltage potential of the mains may be
transferred to touchable components in the terminal
box.
Check the direction of rotation when starting up after
Caution
switching to emergency operation.
28

19. Maintenance and service

19.1 Cleaning of the motor

Keep the motor cooling fins and fan blades clean to ensure
sufficient cooling of the motor and electronics.

19.2 Relubrication of motor bearings

1.1 - 7.5 kW pumps
The motor bearings are of the closed type and greased for life.
The bearings cannot be relubricated.
11-22 kW pumps
The motor bearings are of the open type and must be relubricated
regularly.
The motor bearings are prelubricated on delivery. The built-in
bearing monitoring function will give a warning indication on the
R100 when the motor bearings are due to be relubricated.
Before relubrication, remove the bottom plug in the
motor flange and the plug in the bearing cover to
Note
ensure that old and excess grease can escape.
When relubricating the first time, use the double quantity of
grease as the lubricating channel is still empty.
Frame size
Drive end
MGE 160
MGE 180
The recommended grease type is a polycarbamide-based
lubricating grease.

19.3 Replacement of motor bearings

11-22 kW motors have built-in bearing monitoring function which
will give a warning indication on the R100 when the motor
bearings are due to be replaced.

19.4 Replacement of varistor (only 11-22 kW)

The varistor protects the pump against mains voltage transients.
If voltage transients occur, the varistor will be worn over time and
need to be replaced. The more transients, the more quickly the
varistor will be worn. When it is time to replace the varistor, R100
and PC Tool E-products will indicate this as a warning.
A Grundfos technician is required for replacement of the varistor.
Contact your local Grundfos company for assistance.

19.5 Service parts and service kits

For further information on service parts and service kits, visit
www.grundfos.com, select country, select WebCAPS.
Quantity of grease
[ml]
Non-drive end
13 13
15 15