Siemens SIMOTICS XP 1MD4, Operating Instructions And Installation Instructions, Page: 53 / 128

CAUTION
Working on terminal boxes of the "Ex e" type of protection with undrilled cable entry plate
This can result in death, serious injury or material damage.
Ensure that the cable entry plate is still strong enough after drilling the threads.
6.2.3 Connecting the grounding conductor
The cross-section of the machine grounding conductor must comply with the installation
regulations and also with IEC / EN 60204-1.
Table 6-1 Determining the cross-section of the grounding conductor
External cable cross-section S Cross-section of the grounding conductor [mm²]
S ≤ 16 mm² S
16 mm² < S ≤ 35 mm² 16 mm²
S > 35 mm² S/2
A terminal strip for grounding is fitted either on the stator casing or on the flanged endshield,
depending on the frame size. The grounding point is marked.
The terminal strip is suitable for connecting stranded cables with cable lugs or connecting flat
straps. In addition, all motors have a PE terminal within the terminal box.
When connecting up the grounding conductor, ensure that the contact surface of the
connection is bare and protected against corrosion using a suitable agent, e.g. with acid-free
Vaseline.
6.2.4 Circuit diagram in the terminal box cover
Data on the connection and connecting the motor winding can be found in the circuit diagram
in the cover of the terminal box.
6.2.5 Terminal designation
According to IEC / EN 60034‑8, the following basic definitions apply to the terminal
designations for 3-phase machines:
Table 6-2 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
Electrical connection
6.2 Connecting
SIMOTICS XP 1MD4/1MD5
Operating Instructions 05/2015
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