Installation And Commissioning; General; Motors With Other Than Ball Bearings; Insulation Resistance Check - ABB M3JP Manuel D'installation

4. Installation and commissioning

WARNING
Disconnect and lock out before working on the
motor or the driven equipment. Ensure no explosive
atmosphere is present while executing insulation
resistance check procedures.

4.1 General

All rating plate values relating to certification must be
carefully checked to ensure that the motor protection,
atmosphere and zone are compatible.
Special attention should be paid to dust ignition tempera-
ture and dust layer thickness in relation to the motor's
temperature marking.
Motors Motors requiring protective roof:
When fitted in a vertical position with the shaft pointing
downwards, the motor must have a protective cover to
prevent foreign objects and fluid from falling into the
ventilation openings. This task can also be achieved by a
separate cover not fixed to the motor. In this case, the
motor must have a warning label.
4.2 Motors with other than ball
bearings
Remove transport locking if employed. Turn the shaft of
the motor 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 due to a "sliding" effect.
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 Ex d and Ex de motors with angular contact
bearings the axial force must not by any means
change direction, because the flameproof gaps
around the shaft change dimensions and may even
cause contact!
The bearing types are specified on the rating plate.
Motors equipped with re-greasing nipples:
When starting the motor for the first time, or after long
storage, apply the specified quantity of grease.
See section "7.2.2 Motors with re-greasing nipples" for
more details.
8 – ML/EN ABB Motors and Generators | 3GZF500730-47 rev F 08-2016

4.3 Insulation resistance check

Measure insulation resistance before commissioning and
when winding dampness is suspected.
Insulation resistance, corrected to 25 °C, may not in any
cases be below 1 MΩ (measured with 500 or 1000 VDC).
The insulation resistance value is halved for each 20°C
increase in temperature.
Figure 1 can be used for the insulation correction to the
desired temperature.
WARNING
To avoid risk of electrical shock, the motor frame
must be grounded and the windings should be
discharged against the frame immediately after each
measurement.
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.
If fitted, drain plugs must be removed and closing valves
must be opened during heating. After heating, make sure
the drain 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.

4.4 Foundation

The end user has full responsibility for the preparation of
the foundation.
Metal foundations should be painted to avoid corrosion.
Foundations must be even, , 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.
See figure below.
Ruler
Note! Height difference shall
not exceed ± 0,1 mm referred
to any other motor foot
Foot location
Foot location