11
Foundation
General
The erection of machines at the customer’s
site can be done by the customer or by
ABB personnel.
The foundation must be strong enough to bear
the machine, and to withstand torque reaction
and stresses from a belt drive, if used.
Avoid resonances in the operating speed range
and with sixfold mains frequency which may be
caused by the six pulse converter.
The mounting area of the machine must be level
and free from vibrations.
ABB does not accept responsibility regarding
foundations, as this can be influenced by fac
-
tors which are not controlled by ABB.
Caution
The foundation must be dimensioned in such a way that its own natural frequency, including the motor
weight, does not correspond to those disturbing frequencies which normally exist in a thyristor-fed DC
machine.
The mass of the foundation of a foot mounted motor should be five times the mass of the motor or higher.
Remark
Adequate space for inspection, maintenance, electrical cables and cooling ducts must be provided.
Grouting
To ensure satisfactory results, shrink-free con-
crete should be used. The instructions supplied
by the manufacturer of the shrink-free concrete
should be followed.
Mounting blocks or foundation bolts which are
bolted to the machine must hang freely in the
mounting holes during grouting.
Make sure that there are no air pockets in the
concrete. Check that the compression strength
of the concrete and the curing time are in ac-
cordance with the manufacturer’s instructions.
Grouting is normally not permitted at an
ambient temperature below + 5 °C.
DMI A, mm B, mm H, mm P, mm
180 70 120 10 200
200 80 140 10 250
225 80 140 10 250
250 90 160 10 270
280 90 160 10 270
315 160 250 15 450
400 185 280 15 450
Fig. 2 Foundation studs.
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