Electrical Installation | 7
Operating instructions CMVpro 125-400 | Version 1-en
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• Run connection cables in the building securely with clamps or mounting
brackets, and protect them from damage with cable conduit.
• For protection against vibration, run the connection cable between the fan
and cable fasteners to the installation location such that it is flexible and
movable.
Making the cable connection
•
DANGER
Establish an electrically safe work condition before beginning
work.
• Connect the connection cable to the motor protection switch/fuses and the
isolation switch.
• Ensure correct connection of the phase conductors.
• Seal all cable entries such that they are watertight.
• Compare the existing mains voltage and mains frequency with the data on
the motor nameplate and determine the connection type of the electric mo-
tor (star or delta connection).
Y
W2
L1
L2
L3
U2
V2
W1
V1
U1
W2
L1
L2
L3
U2
V2
W1
V1
U1
Fig. 32:
Terminal assignment for delta and star connection
• Open terminal box on electric motor.
• If necessary, move the jumpers on the terminal board according to the ter-
minal assignment.
The terminal assignment is also located on the inside of the terminal box cover.
• Connect the phase conductors (L1, L2, L3) of the motor connection cable to
the terminal board in the correct order.
• Use insulated ring terminals for phase conductors.
• Attach the protective earthing (PE) to the protective earthing connection in
the terminal box using a ring terminal and serrated lock washer.
• Check:
• Cable gland on the terminal box is suitable for the diameter of the con-
nection cable.