6.3.2 Terminal designation
According to IEC / EN 60034‑8, the following basic definitions apply to the terminal
designations for 3-phase machines:
Table 6-1 Terminal designations using the 1U1-1 as an example
1 U 1 - 1 Designation
x Index for pole assignment for pole-changing machines where applicable. A lower
index signifies a lower speed. Special case for split winding.
x Phase designation U, V, W
x Index for winding start (1) or end (2) or if there is more than one connection per
winding
x Additional indices for cases in which it is obligatory to connect parallel power feed
cables to several terminals with otherwise identical designations
6.3.3 Selecting cables
Take the following criteria into account when selecting the connecting cables:
● Rated current
● Rated voltage
● Possibly a service factor
● System-dependent conditions, such as ambient temperature, routing type, cable cross-
section as defined by required length of cable, etc.
● Requirements according to IEC/EN 60204‑1
● Requirements according to IEC/EN 60079-14
● Configuration notes
6.3.4 Connecting the grounding conductor
The grounding conductor cross-section of the machine must be in full conformance with the
installation specifications, e.g. according to IEC / EN 60204-1.
Table 6-2 Determining the cross-section of the grounding conductor
Phase conductor cross-section S
[mm²]
Cross-section of grounding conductor
[mm²]
S > 35 S/2
There is a hexagon bolt with a flat washer and a spring washer on the stator frame at the
designated connecting point for the grounding conductor. The grounding conductor can be
connected as follows:
● With stranded cables with cable lugs
● With flat cables with cable end designed accordingly
Electrical connection
6.3 Preparation
SIMOTICS TN Series N-compact 1LA8
72 Operating Instructions 08/2017
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