Insulation Resistance; Servicing The Product; Cleaning Of The Motor; Relubrication Of Motor Bearings - Grundfos CRE Serie Notice D'installation Et De Fonctionnement

4. Insulate the three leads from each other by means of
insulating tape or the like.
DANGER
Electric Shock
Death or serious personal injury
– Do not bypass the frequency converter by
connecting the power supply leads to the U, V
and W terminals.
– This may cause hazardous situations for
personnel as the high voltage potential of the
power supply may be transferred to touchable
components in the terminal box.
Check the direction of rotation when starting up after
switching to emergency operation.
5. A motor starter is required.

6.2 Insulation resistance

20-30 hp
– Do not measure the insulation resistance of an
installation incorporating E-pumps using high
voltage megging equipment, as this may
damage the built-in electronics.
– The motor leads can be disconnected
separately and the insulation resistance of the
motor windings can be tested.
32

7. Servicing the product

7.1 Cleaning of the motor

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

7.2 Relubrication of motor bearings

20-30 hp 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
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 (DE)
MLE 160 .44
MLE 180 .51
The recommended grease type is a lithium-based lubricating
grease.

7.3 Replacement of motor bearings

20-30 hp 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.

7.4 Replacement of varistor (only 20-30 hp)

The varistor protects the pump against 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.

7.5 Service parts and service kits

For further information on service parts and service kits, visit
www.grundfos.com, select country, select Grundfos Product
Center.
Quantity of grease
[ounces]
Non-drive end (NDE)
.44
.51