
05.2003
Instructions for Design of Drives in Conformance with EMC Regulations
Siemens AG
6SE7087-6QX70 (Version AD)
SIMOVERT MASTERDRIVES
Compendium Motion Control
3-11
Filter
Frequency
converter
Control,
e.g. Simatic
M
3~
Mains
Sensors
(e.g. temp.,
position,
pressure)
Mechanical system
Machine
Cabinet
B
rak
in
g u
nit
Zone A
Grounded partition recommended
Zone B
Zone C
Zone D
Zone E
Fig. 3-8
Sub-dividing a drive system into zones
♦
Zone A is the cabinet connection to the line supply including filter.
The emitted noise should be kept at specific limit values here.
♦
Zone B contains the line reactor and the noise sources: frequency
converter, braking unit, contactor.
♦
Zone C accommodates the control transformer and the noise
receivers: control and sensor system.
♦
Zone D forms the interface between the signal and control cables to
the periphery. A defined noise immunity level is required here.
♦
Zone E comprises the three-phase motor and the motor supply
cable.
♦
The zones should be spatially separated in order to achieve
electromagnetic de-coupling.