2 Installation
MICROMASTER 430 Operating Instructions
26 6SE6400-5AC00-0BP0
Operation with long cables
All inverters will operate at full specification with cable lengths up to 50 m screened
or 100 m unscreened.
The following cable lengths are possible using the output chokes specified in
catalogue DA 51.2 :
Ø screened: 200 m
Ø unscreened: 300 m
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.
♦ 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 7,
Tables starting on page 87).
♦ Use Class 1 60/75
o
C copper wire only (for UL compliance). For tightening
torque see Table 7-2 on page 87.
Access to the power and motor terminals
You can gain access to the mains and motor terminals by removing the covers
(see also Appendices B to D.
The mains and motor connections must be made as shown in Figure 2-6.
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