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The technical specifications stipulate the following that have to be taken into account with
respect to the motor connection:
● Direction of rotation
● The number and arrangement of the terminal boxes.
● The circuit and connection of the motor winding
6.2.2
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
• Please observe the tightening torques for cable entries and other screws.
6.2.2.1
Terminal marking
According to IEC / EN 60034-8, the following basic definitions apply to the terminal markings
for 3-phase machines:
Table 6- 1
1
x
Standard motors SH 63 ... 355
Operating Instructions, 12/2018, A5E38483075A
DANGER
other open entries.
Terminal markings using the 1U1-1 as an example
U
1
-
1 Marking
Index for pole assignment for pole-changing machines where applicable. A lower
index signifies a lower speed. Special case for split winding.
x
Phase designation U, V, W
x
Index for winding start (1) or end (2) or if there is more than one connection per
winding
x Additional indices for cases in which it is obligatory to connect parallel power
feed cables to several terminals with otherwise identical markings
Electrical connection
6.2 Connecting the machine
63
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