Справочник Пользователя для Siemens 410

MICROMASTER 410    Operating Instructions

6SE6400-5EA00-0BP0

29

Figure 2-9

Motor and Power Connections

The inverters are designed to operate in an industrial environment where a high
level of EMI can be expected. Usually, good installation practices will ensure safe
and trouble-free operation. If you encounter problems, follow the guidelines stated
below.

Ø  Ensure that all equipment in the cubicle is well grounded using short, thick

grounding cable connected to a common star point or busbar.

Ø  Make sure that any control equipment (such as a PLC) connected to the

inverter is connected to the same ground or star point as the inverter via a
short thick link.

Ø  Connect the return ground from the motors controlled by the inverters directly

to the ground connection (PE) on the associated inverter.

Ø  Flat grounding conductors are preferred as they have lower impedance at

higher frequencies.

Ø  Terminate the ends of the cable neatly, ensuring that unscreened wires are as

short as possible.

Ø  Separate the control cables from the power cables as much as possible, using

separate trunking, cross them if necessary at 90º to each other.

Ø  Whenever possible, use screened leads for the connections to the control

circuitry.

Ø  Ensure that the contactors in the cubicle are suppressed, either with R-C

suppressors for AC contactors or 'flywheel' diodes for DC contactors fitted to
the coils. Varistor suppressors are also effective. This is important when the
contactors are controlled from the inverter relay.

Ø  Use screened or armored cables for the motor connections and ground the

screen at both ends using the cable clamps.