Design - Siemens SINAMICS S120 Equipment Manual

Table 7-3
Type
24 V DC power supply cables
24 V signal cables
Power cable between Power Module or Motor Module
and motor
DRIVE-CLiQ cables
•
Inside cabinet unit
e.g. connection between CU320 and the first
Power Module or Motor Module or between the
Motor Modules
•
DRIVE-CLiQ MOTION CONNECT connection
cables for external components
For greater lengths, suitable wiring must be connected by the user to provide overvoltage
1)
protection.
Table 7-4
DC supply
Weidmüller
Type: PU DS 24V 16A
Type no.: 868210 0000
Fa. Weidmüller GmbH & Co. KG
7.3.5

Design

All metallic parts in the cabinet must be connected conductively with each other (not paint on
paint) over the greatest possible surface area. Suitable contact or toothed lock washers may
have to be used. Cabinet doors must be connected to the cabinet by means of ground strips,
which should be as short as possible.
Note
Systems/machines are grounded primarily for safety reasons, although this does affect the
interference and noise immunity of drives. A drive system can be ground in a radial manner
or with the greatest possible surface area. Lattice grounding is recommended for drives, that
is, all the parts to be grounded are connected to each other in a lattice manner.
If the drive line-up is arranged on a common unpainted metal-surfaced mounting plate (e.g.
with a galvanized surface) or if several mounting plates are connected conductively with
each other over the greatest possible surface area, no additional equipotential bonding is
needed within the drive line-up because all parts of the switchgear assembly are connected
to the protective conductor system.
The mounting plates are connected to the external protective conductor system by means of
a finely-stranded copper conductor with a cross-section of 16 mm², including the outer
conductor. As of a cross-section of 25 mm² copper, the outer cross-section of the finely-
stranded conductor is halved.
If the devices are installed in the cabinet in any other way, equipotential bonding for each
individual component must be carried out separately. Ensure that the cross-section of the
outer conductor is sufficient.
Contactors, relays, solenoid valves, electrical operating hour counters, and so on in the
cabinet must be connected to anti-interference elements. RC elements, diodes, or varistors
can be used for this purpose. They must be connected on the appropriate coil.
Chassis Power Units Liquid Cooled
SINAMICS S120 Equipment Manual, Edition 12/2007, 6SL3097-2AM00-0BP4
Maximum cable lengths
1)
1)
Recommendations for overvoltage protection
Cabinet Design and EMC
7.3 EMC-compliant drive installation
Maximum length [m]
10
30
300 (shielded)
450 (unshielded)
70
100
24 V signal cables
Weidmüller
Type no.: MCZ OVP TAZ
7-11