Installation And Commissioning; General; Insulation Resistance Check; Foundation - ABB MT Serie Manual De Instalación, Funcionamiento, Mantenimiento Y Seguridad

3. Installation and commissioning

WARNING
Disconnect and lock out before working on the
motor or the driven equipment.

3.1 General

All rating plate values must be carefully checked to
ensure that the motor protection and connection will be
properly done.
WARNING
In case of motors mounted with the shaft upwards
and water or liquids are expected to go down along
the shaft, the user must take in account to mount
some means capable of preventing it.
Remove transport locking if employed. Turn shaft by hand
to check free rotation if possible.
Motors equipped with roller bearings:
Running the motor with no radial force applied to the shaft
may damage the roller bearing.
Motors equipped with angular contact bearing:
Running the motor with no axial force applied in the right
direction in relation to the shaft may damage the angular
contact bearing.
WARNING
For machines with angular contact bearings
the axial force must not by any means change
direction.
The type of bearing is specified on the rating plate.
Motors equipped with regreasing nipples:
When starting the motor for the first time, or after long
storage, apply the specified quantity of grease.
For details, see section "6.2.2 Motors with regreasable
bearings".

3.2 Insulation resistance check

Measure insulation resistance before commissioning and
when winding dampness is suspected.
WARNING
Disconnect and lock out before working on the
motor or the driven equipment.
ABB/Manual for Low Voltage Motors 01-2009
Insulation resistance, corrected to 25°C, must exceed the
reference value, i.e. 100 MΩ (measured with 500 or 1000
V DC). The insulation resistance value is halved for each
20°C rise in ambient temperature.
WARNING
The motor frame must be grounded and the
windings should be discharged against the frame
immediately after each measurement to avoid risk
of electrical shock.
If the reference resistance value is not attained, the
winding is too damp and must be oven dried. The oven
temperature should be 90°C for 12-16 hours followed by
105°C for 6-8 hours.
Drain hole plugs, if fitted, must be removed and closing
valves, if fitted, must be opened during heating. After
heating, make sure the plugs are refitted. Even if the
drain plugs are fitted, it is recommended to disassemble
the end shields and terminal box covers for the drying
process.
Windings drenched in seawater normally need to be
rewound.

3.3 Foundation

The end user has full responsibility for preparation of the
foundation.
Metal foundations should be painted to avoid corrosion.
Foundations must be even, see figure below, and
sufficiently rigid to withstand possible short circuit forces.
They must be designed and dimensioned to avoid the
transfer of vibration to the motor and vibration caused by
resonance.
Ruler
Foot location
Note! Height difference shall
not exceed ± 0,1mm referred
to any other motor foot
EN-7