Siemens SIMOTICS DP series, Руководство по эксплуатации

Страница: 68 / 150

Electrical connection
6.2 Connecting the machine
Standard motors SH 63 ... 355
66
Operating Instructions, 12/2018, A5E38483075A
6.2.2.7 Connecting protruding cables
In the case of connection cables brought out of the machine, no terminal board is installed
on the terminal base of the machine housing. The connection cables are directly connected
to stator winding terminals at the factory.
The connection cables are color-coded or labeled. The customer directly connects individual
cables in the control cabinet for their system in accordance with the labeling.
6.2.2.8 Connection with/without cable lugs
In the case of terminals with terminal clamps, distribute the conductors in such a way that the
clamping heights on both sides of the fillet are about the same. This method of connection
requires that you must bend a single conductor in a U shape or use a cable lug. The same
applies to the inner and outer terminals of the ground conductor.
When connecting up using cable lugs, select their size corresponding to the required cable
cross-section and the stud size. An inclined arrangement is only permitted provided the
required air clearances and creepage distances are carefully maintained.
Remove insulation from the ends of the conductors so that the remaining insulation almost
reaches the cable lug.
Note
The direct contact between the cable lug surfaces and the contact nuts or contact screws
ensure that the connection can conduct current.
6.2.2.9 Minimum air clearances
After proper installation, verify that the minimum air clearances between non-insulated parts
are maintained. Be aware of any protruding wire ends.
Table 6- 2 Minimum air clearance dependent on rms value of the alternating voltage
U
rms
Rms value of the alternating voltage U
rms
Minimum air clearance
mm
≤ 250 V 3.0
≤ 500 V 3.0
≤ 630 V 5.5
≤ 1000 V 8.0
Values apply at an installation altitude of up to 2000 m.
When determining the required minimum air clearance, the voltage value in the table may be in-
creased by a factor of 1.1, so that the rated input voltage range is taken into account during gen-
eral use.