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• For line supplies with grounded line conductor, e.g. TT line supplies, use an isolating
transformer with grounded neutral point (on the secondary side) between the line supply
and the drive system, so that the machine insulation is not excessively stressed.
• When connected to IT line supplies, a monitoring device must signal the 1st fault between an
active part and ground. Remove this fault immediately.
The technical specifications stipulate the following that have to be taken into account with
respect to the connection:
• Direction of rotation
• The number and arrangement of the terminal boxes.
• The circuit and connection of the machine winding
6.4.1
Terminal box
Hazardous voltage
Electric motors have high voltages. When incorrectly handled, this can result in death or severe
injury.
Switch off the machine so that it is in a no-voltage condition before you open the terminal box.
NOTICE
Damage to the terminal box
If you incorrectly carry out work on or in the terminal box, this can result in material damage.
You must observe the following to avoid damaging the terminal box:
• Ensure that the components inside the terminal box are not damaged.
• It must be ensured that there are no foreign bodies, dirt or moisture in the terminal box.
• Close the terminal box using the original seal so that it is dust tight and water tight.
• Use O-rings or suitable flat gaskets to seal entries in the terminal box (DIN 42925) and other
• Please observe the tightening torques for cable entries and other screws.
1FU9
Operating Instructions, 07/2020, A5E46712792A
DANGER
open entries.
Electrical connection
6.4 Connecting the machine
59
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