Siemens 1PQ8, Operating Instructions & Installation Instructions

Page: 68 / 140

The cable entry plate features a customized design according to the corresponding order.
Insert the cable into the terminal box
1. Unscrew the cable entry plate.
2. Drill the required number of holes or tapped holes in the required size into the cable entry
plate.
3. Fit the required cable glands.
4. Route the cables through the cable glands.
5. Fit the cable entry plate to the terminal box with the assembled cables.
– Lay the cables and in particular the PE conductor in the terminal box in an open
arrangement so that chafing of the cable insulation is prevented.
– Lay and secure external auxiliary cables separately from the main cable. Elements with
cable ties are attached to the floor of the terminal box next to the walls.
6. Connect the ends of the cables to the terminals in accordance with the circuit diagram. The
circuit diagram is located in the cover of the terminal box.
Refer to the "Connecting cables..." section for more information.
6.4.2 Laying cables
● Lay the cables in accordance with IEC/EN 60364-5-52.
● Use EMC cable glands for fixed cables. Screw the EMC cable glands into the threaded
holes in the entry plate, which can be unscrewed.
● Use shielded cables whose shields are conductively connected to a large area of the
terminal box of the motor via EMC cable glands.
● In the case of aluminum connecting bars, insert a steel washer between the cable lug and
the connecting bar. This prevents contact corrosion.
● Arrange the exposed connecting cables in the terminal box so that the PE conductor has
excess length and the insulation of the cable strands cannot be damaged.
● Close off unused bushings with a metal threaded plug. This is the way to achieve a high
frequency-proof shielding.
6.4.3 Connecting cables with cable lugs
1. Select the cable lugs according to the required cable cross-section and fixing screw or stud
size. Information about the maximum cross-section for the respective standard terminal
box design can be found in the catalog.
A sloped/angular arrangement of the supply cables is only permitted provided the required
minimum air clearances are met.
2. Remove the insulation from the conductor ends so that the remaining insulation reaches
almost up to the cable lug
①
. Connect only one conductor per cable lug.
Electrical connection
6.4 Introducing and routing the cables
SIMOTICS TN Series N-compact 1LH8
68
Operating Instructions 06/2017