Siemens MICROMASTER 411 - Manual (Page 35)

Issue 03/01 2 Installation
MICROMASTER 411 & COMBIMASTER 411 Operating Instructions
6SE6400-5CA00-0BP0 35
Power Connections
The information given in Figure 2-10 shows the connection of the motor wires to
the filter board terminals. Power cables should be connected to the inverter
terminals as detailed in the following procedure.
For cable size and rating refer to Section 7.3
1. If the Inverter cover (the top-half) has already been fitted, unscrew the four M5
cross-head captive screws on the inverter cover.
2. Remove inverter (cover) to access the connection terminals.
3. Feed the power cable into the terminal housing via the appropriate gland hole.
4. Connect power leads to terminals L1, L2, L3 and to the separate earth.
To avoid snagging on components when the inverter halves are brought
together, run cables along the base of the terminal housing.
5. Use Class 1 75 o C copper wire only. Use a 4-core cable. If crimp terminals are
used they must be insulated. If crimps are not used, the strip length must not
exceed 5 mm. Use a 4 - 5 mm cross-tip screwdriver to tighten the terminal
screws.
6. Recommended tightening torque for power supply terminals is as given in
Section 7.3.
7. A ‘drip loop’ is recommended when connecting the mains and control cables.
8. Ensure that the power source provides the correct voltage and is designed for
the rated current. Use appropriate circuit-breakers with specified current rating
between the power supply and inverter.
9. Ensure the appropriate circuit breakers/fuses with the specified current rating
are connected between the power supply and the inverter. (See Section 7.5).
WARNING
It is essential that the Inverter be correctly earthed to the motor earth. Severe
injury may result if the motor is not correctly earthed.
If the Inverter is being installed after a period of storage please refer to the
information in Section 2.1
Motor Connections for Star/Delta
The information given in Figure 2-10 also shows the connection of motor wires to
the filter board inverter/motor terminals. Motor wires should be connected in either
star or delta configuration in accordance with the motor rating plate. For cable size
and rating refer to Section 7.3.