Siemens Simovert Masterdrives Compendium page 98

05.2003
Siemens AG 6SE7087-6QX70 (Version AD)
SIMOVERT MASTERDRIVES
Instructions for Design of Drives in Conformance with EMC Regulations
Mains
Zone A
Filter
Zone B
Frequency
converter
Zone E
Machine
M
3~
Grounded partition recommended
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.
Compendium Motion Control
Cabinet
Zone C
Control,
e.g. Simatic
Zone D
Sensors
(e.g. temp.,
position,
pressure)
Mechanical system
3-11