User`s guide

40
CHAPTER 3 - INSTALLATION
AND CONNECTION
3.2.4.3
Grounding
Connections
If theCFW-08 isinstalled innetworks which can supplymore
than 30.000 Arms, you must provide suitable protection
circuits such as fuses and circuit breakers.
DC link inductor / line reactors
The requirements for use of line reactors or DC link inductor
depend on several application factors. Refer to item 8.21.
NOTE!
Capacitors for power factor correction are not required at the
input (L/L1, N/L2,L3orR,S,T)andtheymust notbeconnected
at the output (U, V, W).
The inverter is provided with electronic protection against
motor overload. This protection must be set according to the
specificmotor. When thesameinverter drives several motors,
use individual overload relays for each motor. Maintain the
electrical continuity of the motor cable shield.
ATTENTION!
If a disconnect switch or a contactor is inserted in the motor
supply line, do not operate them with motor running or when
inverter is enabled. Maintain the electrical continuity of the
motor cable shield.
Dynamic braking (DB)
When inverters with dynamic braking (DB) are used, the DB
resistor shall be mounted externally. Figure 8.31 shows how
to connect the braking resistor. Size it according to the
application,notexceeding themaximum current of thebraking
circuit. For the connection between inverter and the braking
resistor, use twisted cable. Provide physical separation
between this cable and the signal and control cables. When
the DB resistor is mounted inside the panel, consider watt
loss generated when defining the panel ventilation.
DANGER!
The inverter must be grounded to a protective earth (PE) for
safetypurposes.
The earth or ground connection must comply with the local
regulations.For grounding, use cables with cross sections as
indicated in table 3.4. Make the ground connection to a
grounding bar or to the general grounding point (resistance

10 ohms).
DANGER!
Do not share the ground wiring with other equipment that
operates withhigh currents(forinstance:high voltage motors,
welding machines, etc). If several inverters are used together,
refer to figure 3.7.
3.2.4.2
Output
Connections