Installation and Connection
3
CFW-11 | 3-35
ATTENTION!
A contactor or another device that frequently disconnects and reapplies the AC supply to the inverter,
in order to start and stop the motor, may cause damage to the inverter power section. The drive
is designed to use control signals for starting and stopping the motor. If used for that purpose, the
input device must not exceed one operation per minute; otherwise, the inverter may be damaged.
ATTENTION!
The power supply that feeds the inverter shall have a grounded neutral. In case of IT networks, follow
the instructions described in Item 3.2.3.1.2 IT Networks on page 3-35.
NOTE!
The input power supply voltage shall be compatible with the inverter rated voltage.
NOTE!
Power factor correction capacitors are not needed at the inverter input (R, S, T) and shall not be
installed at the output of the inverter (U, V, W).
3.2.3.1.1 AC Power Supply Considerations
Suitable for use in circuits capable of delivering not more than 65,000 Arms symmetrical at 240 V or 480 V for
maximum 480 V rated models, and 14,000 Arms symmetrical at 600 V for maximum 690 V rated models, when
protected by inverse-time circuit breakers rated for the input voltage of the drive and 130 % of the full-load motor
output current rating.
Table 3.9 - Maximum rated current of the circuit breakers according to the inverter model
Frame Size
Maximum Circuit Breaker
Current Rating
Enclosure Dimensions
(D x H x W) mm
B 30 A 203 x 457 x 508
C 125 A 203 x 610 x 508
D 250 A 203 x 762 x 610
E 250 A 254 x 914 x 660
F 800 A 600 x 2000 x 800
G 800 A 600 x 2000 x 1400
H 1200 A 600 x 2000 x 1400
3.2.3.1.2 IT Networks
ATTENTION!
For using the inverter CFW11...T5 or T6 in IT networks (neutral conductor not grounded or grounded
via high ohmic value resistor) or in corner-grounded delta networks, the following modifications are
required in the connections of some internal components to ground:
Frame sizes B, C and D: remove the screw as indicated in Figure 3.26 on page 3-36.
Frame size E: change the position of the J1 jumper on the PRT board from (XE1) to "NC"
(XIT), according to Figure 3.27 on page 3-36.
Frame sizes F, G and H: disconnect the cable with the ring tongue lug from the ground busbar and
connect it to the isolated point on the power terminal block as shown in the Figure 3.28 on page 3-37,
Figure 3.29 on page 3-37 and Figure 3.30 on page 3-37 .
That is necessary to avoid damage to the inverter when operating with a line input shorted to ground.
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