Siemens EK 726 Series Wartungshandbuch PDF herunterladen (Seite 31)

ENGINEERING INFORMATION AND INSTRUCTIONS

MICROMASTER

MICROMASTER Vector

MIDIMASTER Vector

SIEMENS DA 64 – 2002/2003

3/7 Version D

Separate filter

Metal

mounting plate

Supply

Retain the motor and control

cables to the metal plate

using suitable clamps

3.4 Mounting and installation guidelines

Fig. 3.11.3 Wiring guidelines to optimize the noise

immunity of MICROMASTER and MICROMASTER Vector,

Size C

The drive inverters are designed for use in industrial

environments with strong electromagnetic noise and

disturbances. Generally, safe, reliable and fault-free operation is

guaranteed if the drive units have been correctly installed.

However, if problems do occur, then the following guidelines

might possibly help. It can be especially effective to connect the

drive inverter ground potential, as subsequently described, to 0

V of the system.

(1) Ensure that all of the drive units are correctly grounded

using a short grounding cable with adequate cross-

section, to a common neutral point or a busbar. It is

especially important that all of the control devices,

connected to the drive inverter (for example, a PLC) are

connected to the same grounding or neutral point through

a short grounding cable with adequate cross-section. Flat

conductors are preferred (for example, finely-stranded or

metal brackets), as they have a low impedance at high

frequencies.

If motors are fed from the drive inverter, the potential

bonding conductor should be directly connected to 0 V

(PE) of the particular drive inverter.

(2) Remove the paint from the mounting plate in order to

establish a good electrical connection between the

heatsink and the housing. Please use serrated washers

when mounting and installing MIDIMASTER Vector.

(3) When possible, use shielded cables to connect-up the

control terminals. Assemble the cable ends correctly so

that non-shielded wires and conductors are kept as short

as possible. Where possible, use cable glands.

(4) Separately route the control cable, as far as possible, away

from the supply cable. This can be realized, for example, by

using separate cable ducts. If control cables and line supply

cables (power cables) cross over, then arrange the cables so

that they cross at an angle of 90°.

(5) Ensure that the contactors in the electrical cabinet are

provided with noise suppression devices. For AC coils,

use RC elements or for DC coils, use free-wheeling

diodes. Varistors are also effective. This is especially

important if the contactors are controlled using the drive

inverter relay connection.

(6) Use shielded cables to connect-up the motors or route

the cables in a protective pipe and ground the shield at

both ends using cable glands.

(7) If the drive inverters are installed in an environment

which is prone to electromagnetic disturbances, then a

noise suppression filter should be used to dampen the

cable-borne and radiated noise and disturbances. In

order to guarantee optimum operating conditions, there

should be a good electrical connection between the filter

and the mounting plate.

(8) If a line-side EMC filter and line reactor are

simultaneously used, the EMC filter must be located

between the drive inverter and line reactor.

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