Siemens MICROMASTER 420 - Manual (Page 29)

Issue 07/04 2 Installation
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0 29
2.4.2 Power and motor connections
WARNING
The inverter must always be grounded.
♦ Isolate the mains electrical supply before making or changing connections to
the unit.
♦ Ensure that the motor is configured for the correct supply voltage: single /
three-phase 230 V MICROMASTERS must not be connected to a 400 V
three-phase supply.
♦ When synchronous motors are connected or when coupling several motors in
parallel, the inverter must be operated with voltage/frequency control
characteristic (P1300 = 0, 2 or 3).
CAUTION
After connecting the power and motor cables to the proper terminals, make sure
that the covers have been replaced properly before supplying power to the unit!
NOTICE
♦ Ensure that the appropriate circuit-breakers/fuses with the specified current
rating are connected between the power supply and inverter (see chapter 5,
Tables starting on page 160).
♦ Use Class 1 60/75 o C copper wire only (for UL compliance). For tightening
torque see Table 5-2, page 159.
Access to the power and motor terminals
You can gain access to the mains and motor terminals by removing the covers
(see also Appendices A and B).
The mains and motor connections must be made as shown in Fig. 2-6.
L2/N
L3
L1/L
U V W
Fig. 2-5 MICROMASTER 420 connection terminals