6.8
Separating adjacent cabinets using unsuppressed contactors
Do not use any contactors without suppression in the converter cabinets or in cabinets that are
connected to the converter cabinets. All contactors installed in the factory are already equipped
with a suppression circuit. If you use unsuppressed contactors in an adjacent cabinet, you must
partition off the cabinets using a lateral metal plate.
Connect surge suppressors to contactor solenoids that are connected to the same line supply
as the auxiliary power supply of the converter – or are located near the converter (e.g. RC
elements, varistors).
6.9
Laying additional wiring
Keep any additional wiring in the cabinet as short as possible. Route the additional wiring tightly
against the cabinet enclosure or the mounting plates. You must twist unshielded cables
belonging to the same circuit (outgoing and return conductors).
See also
Electromagnetic compatibility (Page 61)
6.10
Connecting the closed-loop control
6.10.1
Connecting ground
DANGER
Danger due to failure of the protective and monitoring equipment
The converter must be grounded to ensure that it operates safely and reliably. If the converter
is operated with insufficient grounding, then the protection and monitoring functions can fail.
Death, serious injury, or material damage will result.
● Always apply all of the necessary protective measures.
● Always observe the five safety rules when working with the converter.
● Follow these steps when grounding the machine:
– Establish the connections in a cabinet.
– Ensure that the connections are also established over several cabinets.
– Establish the ground connection for the whole plant immediately.
Each cabinet has a grounding lug for grounding the components installed in the cabinet. It is
located at the bottom of the cabinet. Connect the cabinets securely to the plant grounding
system via these grounding lugs.
Electrical connection
6.10 Connecting the closed-loop control
SINAMICS SL150 6SL39616RC100AA02
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Operating Instructions Rev.201910281458 EXAMPLE
