Starting Up The Product; Shaft Seal Run-In - Grundfos CR Instructions D'installation Et D'utilisation

3.2.7 Phase insulation, MG 71 and 80
MG motors, frame sizes 71 and 80, do not have
phase insulation as standard. The motors are not
suitable for frequency converter operation as they
are not protected against the voltage peaks caused
by the frequency converter operation. Only motors
with a rated voltage equal to 460 V or above have
phase insulation.
Frequency converter operation of MG
motors without phase insulation will cause
damage to the motor.
We recommend that you protect all other motors
against voltage peaks higher than 1200 V by 2000 V/
μsec.
You can eliminate the above disturbances, that is
both increased acoustic noise and detrimental
voltage peaks, by fitting an LC filter between the
frequency converter and the motor.
For further information, contact the frequency
converter or motor supplier.

4. Starting up the product

WARNING
Corrosive liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
- Pay attention to the direction of the vent
hole when you fill the pump with liquid
and vent it.
- Make sure that no persons are hurt by
the escaping liquid.
Fill the pump with liquid and vent it before
you start the pump.
Pay attention to the direction of the vent
hole during liquid filling and venting. Make
sure that the escaping liquid does not
cause damage to the motor or other
components.
If the pump runs dry, the pump bearings
and the shaft seal may be damaged.
12
Fig. 16 Vent valve, standard and an optional
solution with hose connection
Follow the startup instructions in the appendix.
CR, CRI, CRN 1s to 5
For these pumps, we recommend that you open the
bypass valve during startup. See fig.
valve location. The bypass valve connects the inlet
and outlet sides of the pump, thus making the filling
procedure easier. Close the bypass valve again
when the operation is stable.
When pumping liquids containing air, we recommend
that you leave the bypass valve open if the operating
pressure is lower than 6 bar.
Close the bypass valve if the operating pressure
constantly exceeds 6 bar. Otherwise, the material at
the opening will be worn because of the high liquid
velocity.

4.1 Shaft seal run-in

WARNING
Corrosive liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
Make sure that a leakage does not cause
damage to the equipment.
18 for bypass