Power And Motor Connections - Siemens MICROMASTER Vector Operating Instructions Manual

3. INSTALLATION – MIDIMASTER Vector
To gain access to the power and control terminals:
· Frame size 4, 5 : remove the four M4 screws from the front cover and remove the cover from the inverter.
· Frame size 6: remove the six M4 screws from the front cover and remove the cover from the inverter.
· Frame size 7: remove the four M4 screws from the lower front cover and remove the lower front cover from the inverter.
WARNING
Ensure that the motor is configured for the correct supply voltage.
Make sure that the input power supply is isolated before making or changing any connections.
When synchronous machines are connected or when coupling several motors in parallel, the inverter must be operated
with voltage/frequency control characteristic (P077= 0 or 2) and slip compensation must be disabled (P071 = 0).
CAUTION
The control, power supply and motor leads must be laid separately. They must not be fed through the same cable
conduit/trunking.
High voltage insulation test equipment must not be used on cables connected to the inverter.
Use screened cable for the control cable, Class 1 60/75
Feed the cables through the correct glands in the base of the inverter. Secure the cable glands to the inverter and connect the leads to
the power, motor and control terminals in accordance with the information supplied in sections 3.2.1 and 3.2.2. Ensure that the leads
are connected correctly and the equipment is properly earthed.
Frame size 4 and 5: Tighten up each of the power and motor terminal screws to 1.1 Nm.
Frame size 6: Tighten up each of the power and motor terminal Allen-screws to 3.0 Nm.
Frame size 7: Tighten up each of the M12 power and motor terminal nuts to 30 Nm.
Secure the front cover to the inverter when all connections are complete.

3.2.1 Power and Motor Connections

1. Ensure that the power source supplies the correct voltage and the necessary current. Ensure that the appropriate circuit-breaker or
fuses with the specified current rating are connected between the power supply and inverter (see section 8).
2. Connect the power input to the power terminals L1, L2, L3 (3 phase) and earth (PE) (shown in Figure 3.2.1) using a 4-core cable
and lugs to suit the cable size. For the cross-section of each core, see section 8.
3. Use a 4-core screened cable and suitable lugs to connect the motor leads to the motor terminals U, V, W and earth (PE) (shown in
Figure 3.2.1).
Note: For operation with cables longer than 25m see section 1.3.4
4. If required, connect the braking unit leads to the DC- and DC+ terminals.
5. Tighten all the power and motor terminals.
Asynchronous and synchronous motors can be connected to the MIDIMASTER Vector inverters either individually or in parallel.
Note : If a synchronous motor is connected to the inverter, the motor current may be two and a half to three times greater than that
expected so the inverter must be de-rated accordingly.
© Siemens plc 1999
C copper wire only.
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G85139-H1751-U529-D1
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