Insulation Resistance; Maintaining And Servicing The Motor; Cleaning Of The Motor; Relubrication Of Motor Bearings - Grundfos LFE Instrucciones De Instalación Y Funcionamiento

4. Insulate the three leads from each other by means of
insulating tape or similar means.
DANGER
Electric shock
Death or serious personal injury
- Do not bypass the variable frequency drive 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.

26. Insulation resistance

3-10 hp
Do not measure the insulation resistance of motor
windings or an installation incorporating E-pumps
using high voltage megging equipment, as this may
damage the built-in electronics.
15-30 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.
50
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27. Maintaining and servicing the motor

27.1 Cleaning of the motor

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

27.2 Relubrication of motor bearings

3-10 hp pumps
The motor bearings are of the closed type and greased for life.
The bearings cannot be relubricated.
15-30 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 GO Remote or R100 when the motor bearings are due to
be relubricated.
When relubricating the first time, use the double quantity of
grease as the lubricating channel is still empty.
The recommended grease type is a polycarbamide-based
lubricating grease.

27.3 Replacement of motor bearings

Motors from 15-30 hp have built-in bearing monitoring function
which will give a warning indication on the Grundfos GO Remote
or R100 when the motor bearings are due to be replaced.
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.
Quantity of grease
Frame size
Drive end
(DE)
MLE 160 0.44
MLE 180 0.51
[ounces]
Non-drive end
(NDE)
0.44
0.51