Electrical installation
4.6 Power connections
Drive converter cabinet units
52 Operating Instructions, 07/07, A5E00288214A
4.6 Power connections
WARNING
Swapping the input and output terminals can destroy the device!
Swapping or short-circuiting the DC link terminals can destroy the device!
The contactor and relay operating coils that are connected to the same supply network as
the device or are located near the device must be connected to overvoltage limiters (e.g.
RC elements).
The device must not be operated via a residual current operated device (DIN VDE 0160).
4.6.1 Connection cross-sections and cable lengths
Connection cross-sections
The connection cross-sections for the line connection, motor connection, and ground
connection for your device are specified in the tables provided in the "Technical
specifications" section.
Cable Lengths
The maximum permissible cable lengths are specified for standard cable types or cable
types recommended by SIEMENS. Longer cables can only be used after consultation.
The listed cable length represents the actual distance between the converter and the motor,
taking account factors such as parallel laying, current-carrying capacity, and the laying
factor.
● Unshielded cable (e.g. Protodur NYY): max. 450 m
● Shielded cable (e.g., Protodur NYCWY, Protoflex EMV 3 Plus): max. 300 m.
Note
The cable lengths specified are also valid if a motor choke is in use (option L08).
Note
The PROTOFLEX-EMV-3 PLUS shielded cable recommended by Siemens is the
protective conductor and comprises three symmetrically-arranged protective conductors.
The individual protective conductors must each be provided with cable eyes and be
connected to ground. The cable also has a concentric flexible braided copper shield. To
comply with EN55011 regarding radio interference suppression, the shield must contact
at both ends and with the greatest possible surface area.
On the motor side, cable glands that contact the shield with the greatest possible surface
area are recommended for the terminal boxes.
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