Siemens simovert masterdrives Betriebsanleitung Seite 205

05.2006
Rule 15 A noise suppression filter should always be placed close to the fault
source. The filter must be connected to the cabinet housing, mounting
panel, etc. through a large surface area. A bare metal mounting panel
(e.g. manufactured from stainless steel, galvanized steel) is best, as
electrical contact is established through the entire mounting surface. If
the mounting panel is painted, the paint has to be removed at the screw
mounting points for the frequency converter and the noise suppression
filter to ensure good electrical contact.
The incoming and outgoing cables of the radio interference suppression
filter have to be spatially separated/isolated.
Rule 16
In order to limit the noise emitted, all variable-speed motors have to be
connected-up using shielded cables, with the shields being connected
to the respective housings at both ends in a low-inductive manner
(through the largest possible surface area). The motor feeder cables
also have to be shielded inside the cabinet or at least shielded using
grounded partitions. Suitable motor feeder cable e.g. Siemens
PROTOFLEX-EMV-CY (4 x 1.5 mm
Cables with steel shields are unsuitable.
A suitable PG gland with shield connection can be used at the motor to
connect the shield. It should also be ensured that there is a low-
impedance connection between the motor terminal box and the motor
housing. If required, connect-up using an additional grounding
conductor. Do not use plastic motor terminal boxes!
Rule 17 A line reactor has to be installed between the radio interference
suppression filter and the SIMOVERT MASTERDRIVES.
Rule 18
The line supply cable has to be spatially separated from the motor
feeder cables, e.g. by grounded partitions.
Rule 19
The shield between the motor and SIMOVERT MASTERDRIVES must
not be interrupted by the installation of components such as output
reactors, sinusoidal filters, dv/dt filters, fuses, contactors. The
components must be mounted on a mounting panel which
simultaneously serves as the shield connection for the incoming and
outgoing motor cables. Grounded partitions may be necessary to shield
the components.
Rule 20
In order to limit the radio interference (especially for limit value class
"First environment "), in addition to the line supply cable, all cables
externally connected to the cabinet must be shielded.
Examples of these basic rules:
Siemens AG 6SE7087-6JK50
SIMOVERT MASTERDRIVES Operating Instructions
Installation in Conformance with EMC Regulations
2 2
... 4 x 120 mm ) with Cu shield.
6-3