4. Mechanical installation
4.1 Checking before installation
•
Make sure that the values on the nameplate are consistent with
the operating requirements, the wiring is consistent with the
wiring diagram and the thermal protection circuit is connected.
•
Measure the insulation resistance of the motor with a
megohmmeter. If the resistance is lower than 5 MΩ, the stator
winding must be dried out thoroughly. The drying temperature
must not exceed 100 °C.
•
Check the motor for damage, deformities and loose parts. Turn
the rotor by hand to check for abnormalities.
•
Check that the motor mounting arrangement is in line with the
requirements. For example, the basic arrangement IM B3 can
be modified to IM V5 by adding additional support or replacing
the bearings to bear the axial load.
•
Clean the dust and dirt on the surface of the motor.
•
If the motor is stored for a long period of time (generally over
one year), check the grease and change it if necessary.
4.2 Foundation
WARNING
Body injury
Death or serious personal injury
‐
The foundation must be carried out in accordance with
the following instructions. Insufficient rigidity or improp-
er structure of the foundation leads to abnormal vibra-
tion and noise and even shaft fracture, and this can
cause accidents when the motor is running.
The motor must have a rigid foundation. If the motor is not installed
together with the driven machine, both must be installed on a
foundation made of concrete. A suitable mounting arrangement
must be selected for motors that are moved frequently.
Any height differences between the motor and the driven machine
must be adjusted. The surface of the shims must be bigger than
that of the motor feet. A maximum of two shims are allowed.
The installation location must be spacious enough for daily
operation and maintenance.
Motors can be connected by couplings. When couplings are used,
the centre lines of coupled shafts must coincide.
When couplings are used, there must be enough clear-
ance between the coupling of the motor and the coupling
of the driven machine to prevent axial force caused by
thermal expansion, which damages bearings.
Make sure that all mounting holes are fixed by steel bolts and nuts.
In places prone to rust, use stainless steel bolts, and in case of high
vibration, use antivibration pads.
In the case of motors with drain holes, make sure that the drain
holes are at the right position. When the drain holes are open,
measures must be taken to prevent any objects from entering the
motor.
5. Electrical connection
•
The electrical connections of the motor, controller, overload
protection and earthing must comply with relevant wiring and
safety standards.
•
Note the markings on the nameplate and the wiring diagram in
the terminal box.
•
Connect the terminals of the thermal protector directly to the
motor control equipment.
•
Motors with Pt100 protection devices generally have auxiliary
terminal boxes. Connect them according to the wiring diagram.
•
Before starting the motor, make sure that the supply voltage and
frequency correspond to the values stated on the motor
nameplate.
•
For multi-speed motors, perform the connection according to
one of the related wiring diagrams. The rotation direction at
different speeds must be confirmed during debugging. For more
information, contact your local Grundfos company.
6
English (GB)
