Motor Connection - Lenze i550 Series Project Planning Manual

Motor connection

Switching in the motor cable
Switching on the motor side of the inverter is permissible:
For safety shutdown (emergency stop).
In case several motors are driven by one inverter (only in V/f operating mode).
Please note the following:
The switching elements on the motor side must be dimensioned for with the
maximum occurring load.
Motor cable lengths
The rated data for the motor cable length must be observed.
•
Keep the motor cable as short as possible as this has a positive effect on the drive behav-
•
iour and the EMC.
Several motors connected to an inverter form a group drive.
•
In case of group drives, the resulting motor cable length l
l [m] = (l + l + l ... l ) ∙ √i
res 1 2 3 i
l Resulting length of the motor cables
res
l Length of the single motor cable
x
i Number of the single motor cables
Shielding
A good shield connection and short cable lengths reduce possible interferences caused by
problems with the EMC.
Example for preparing the EMC-compliant wiring or the motor cable
Fig. 10: Shield connection
① Braid
② large surface contacting of the braid
Information on electrical installation
is relevant:
res
l
①
②
③ Heat-shrinkable tube
l maximally 500 mm
③
Motor connection
57