Siemens SINAMICS G120 Instructions d'exploitation télécharger pdf (Page 40)

Installing

3.3 Installing the Power Module

Inverter with CU240B-2 and CU240E-2 Control Units

38 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB

3.3.5 EMC-compliant connection

The inverters are designed for operation in industrial environments where high values of

electromagnetic interference are expected. Safe, reliable and disturbance-free operation is

only guaranteed if the devices are professionally installed.

Inverters with degree of protection IP20 must be installed and operated in an enclosed

control cabinet.

Control cabinet design

● All metal parts and components of the control cabinet (side panels, rear panels, roof and

base plates) must be connected to the control cabinet frame through a good electrical

connection – this is best achieved using the highest possible surface area or a high

number of individual screw connections

● The PE bar and the EMC shield bar must be connected to the control cabinet frame

through a good electrical connection established through a large surface area.

● All of the metal enclosures of the devices and supplementary components installed in the

cabinet – e.g. inverter or line filter – must be connected to the control cabinet frame

through a good electrical connection through the largest possible surface area. The most

favorable design is to mount these devices and supplementary components on a bare

metal mounting plate with good conducting characteristics; this in turn is connected to the

control cabinet frame through a good electrical connection and the largest possible

surface area. It is especially important that they are connected to the PE and EMC shield

bars.

● All of the connections must be implemented so that they are durable. Screw connections

to painted or anodized metal components must either be established using special

contact (serrated) washers that cut through the insulating surface and therefore establish

a metallic conductor contact, or the insulating surface must be removed at the contact

locations.

● Coils of contactors, relays, solenoid valves and motor holding brakes must be equipped

with interference suppression elements in order to dampen high-frequency radiation

when switching-off (RC elements or varistors with AC coils and free-wheeling diodes or

varistors for DC coils). The protective circuit must be directly connected at the coil.

Cable routing and shielding

● All inverter power cables (line supply cables, connecting cables between the braking

chopper and the associated braking resistance as well as the motor cables) must be

separately routed away from signal and data cables. The minimum clearance should be

approx. 25 cm. As an alternative, the decoupling can be realized in the control cabinet

using metal partitions (separating elements) connected to the mounting plate through a

good electrical connection

● The cables from the line supply to the line filter must be routed separately away from non-

filtered power cables with a high noise level (cables between the line filter and inverter,

connecting cables between the braking chopper and the associated braking resistor as

well as motor cables)

● Signal and data cables as well as filtered line supply cables may only cross non-filtered

power cables at right angles

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Siemens SINAMICS G120 Instructions d'exploitation Page 40

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Siemens SINAMICS G120 Instructions d'exploitation Page 40

Commentaires sur ces manuels

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