ABB High dynamic performance HDP Serie Manuel D'installation, D'utilisation Et De Maintenance page 13

ENGLISH
Motors equipped with cylindrical roller bearings
Running the motor with no radial force applied to the shaft may damage the roller bearing.
Motors equipped with regreasing nipples
When starting the motor for the first time or after it has been in storage more than 6 months, apply the specified
quantity of grease.
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.
For details, see Chapter 1.7.2.2 Motors with regreasable bearings.
1.4.2 Insulation resistance check
Measure insulation resistance (IR) before commissioning, after long periods of standstill or storage when
winding dampness may be suspected. IR shall be measured directly on the motor terminals with the supply cables
disconnected in order to avoid them affecting the result.
Insulation resistance should be used as a trend indicator to determine changes in the insulation system. In new
machines, the IR is usually thousands of MΩ and thus following the change of IR is important so as to know the
condition of the insulation system. Typically, the IR should not be below 10 MΩ and in no case below 1 MΩ (measured
with 500 or 1000 VDC and corrected to 25°C). The insulation resistance value is halved for each 20°C increase in
temperature.
Figure 6 Diagram illustrating the insulation resistance dependence from the temperature and how to correct the
measured insulation resistance to the temperature of 40°C, can be used for the insulation correction to the desired
temperature.
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 hole plugs must be removed and closing valves must be opened during heating. After heating, make
sure the plugs are refitted. Even if the drain plugs are fitted, disassembling the end shields and terminal box covers
for the drying process is recommended.
Windings drenched in seawater normally need to be rewound.
WARNING:
1.4.3 Foundation
The end user has full responsibility for preparation of the foundation.
Metal foundations should be painted to avoid corrosion.
Foundations must be even 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.
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.
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