Lenze i750 - Detecting and Eliminating EMC Interferences

Detecng and eliminang EMC in
terferences
Trouble Cause Remedy
Interferences of analog setpoints of your own
or other de
vices and measuring systems
Unshielded motor cable has been used Use shielded motor cable
Shield contact is not extensive enough Carry out opmal shielding as specied
Shield of the motor cable is interrupted, e. g. by
terminal strips, switches etc.
•
Separ
ate components from other component
parts with a minimum distance of 100 mm
•
Use motor chokes or motor lters
Addional unshielded c
ables inside the motor
cable have been installed, e. g. for motor
temperature monitoring
Install and shield addional cables separately
Too long and unshielded cable ends of the
motor cable
Shorten unshielded cable ends to max. 40 mm
Conducted interference level is exceeded on the
supply side
Terminal strips for the motor cable are directly
located next to the supply terminals
Spaally separate the terminal strips for the
motor cable from mains terminals and other
control terminals with a minimum distance of
100 mm
Mounng plate varnished Opmize PE connecon:
•
Remove varnish
•
Use zinc-coated mounng plate
HF short circuit Check cable roung
Malfuncons of the eldbus communicaon or
exceedance of the permissible interference
levels
Shield contact is not extensive enough Before leaving the control cabinet, connect the
shield of the eldbus cable with the
equipotenal bonding system (e. g. mounng
plate) on a large surface.
Shield connecon on the inverter only
Shield of eldbus cable connected on one side
only
Shield connecon on both sides
Electrical ins
tallaon
EMC-compliant installaon
Detecng and eliminang EMC interferences
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