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3GZF500725-144 EN 03-2023 | ABB IEC LV MOTORS
for the insulation resistance can be found from the product specific manuals. If limit values
are not reached, dry the winding according to the manufacturer's instructions.
2.4.
Installation
Ensure even support, solid foot or flange mounting and exact alignment in the case of direct
coupling. Avoid resonances with rotational and double mains frequency as a result of assem-
bly. Turn rotor and listen for abnormal slip noises and check direction of rotation in uncou-
pled state.
Follow the manufacturer’s instructions when mounting or removing couplings or other drive
elements and cover them with a touch guard. To do a trial run without output elements, lock
or remove the shaft end key. Avoid excessive radial and axial bearing loads (note manufactur-
er's documentation). The type of balancing is indicated in the shaft,( see product specific
manuals). In case of protruding, visible part of the shaft end key, establish mechanical bal-
ance.
Make the necessary ventilation and cooling system connections making sure that the ventila-
tion does not get obstructed and that exhaust air either from the current machine or other
machines, is not drawn into the ventilation intake.
The terminals of a machine with frequency converter supply may be energized even when the
machine is at a standstill.
Beware of reverse-power when working at the supply system.
Machines covered by this instruction are not suitable for direct online use (DOL).
3.
Electrical connection
When the machine shaft is rotating, a permanent magnet machine induces voltage to the ter-
minals. The induced voltage is proportional to the rotational speed and can be hazardous
even at low speeds. Prevent any rotation of the shaft before opening the terminal box and/or
working at the unprotected terminals.
The terminals of a machine with frequency converter supply may be energized even when the
machine is at a standstill.
Beware of reverse-power when working at the supply system.
Machines covered by this instruction are not suitable for direct online use (DOL).