Power Supply Capacity; It Networks - WEG CFW-11 User Manual

Installation and Connection

3.2.3.1.1 Power Supply Capacity

Suitable for circuits with capacity to deliver no more than:
- 100 kA symmetric at 240 V or 480 V when the inverter is protected by fuses;
- 65 kA symmetric at 240 V or 480 V when the inverter is protected by reverse-type circuit breakers.
For compliance with UL standard and specification of current of fuses and circuit breaker see
page 3-22.
Model
Current of
(Amps Max.)
CFW11 0242 T 4
CFW11 0312 T 4
CFW11 0370 T 4
CFW11 0477 T 4
CFW11 0515 T 4
CFW11 0601 T 4
3
CFW11 0720 T 4
CFW11 0795 T 4
CFW11 0877 T 4
2 x 900 A
CFW11 1062 T 4
CFW11 1141 T 4

3.2.3.1.2 IT Networks

ATTENTION!
To use frame sizes F, G and H inverters in IT networks (neutral ungrounded or grounded through a
high ohmic value resistor), or in corner-grounded delta networks, it is necessary to 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 showed in the
This is necessary to avoid damages when operating with a line input short circuited with the ground.
NOTE!
The ground-fault protection (F074) is intended for IGBT protection and may not be activated when
inverter output is shorted to ground, when fed by IT networks.
External insulation monitoring devices should be used for system fault monitoring.
3-22 | CFW-11
Table 3.5 - Fuses and circuit breaker specifications according to UL standard
Protection with Fuse Ultra-Fast
Rated Ferraz-Shawmut
Semiconductor / WEG
Fuse High Speed
Fuse Models
700 A A70P700-4
900 A A70P900-4
FNH3-900K-A
Inverter Protection With Circuit Breaker
Rated
Maximum Power
Current
Supply Short-
of Circuit
Circuit Current (Depth X Height X Width)
Breaker
300 A
400 A
600 x 2000 x 800 mm
450 A
600 A
600 A
100 kA 700 A 600 x 2000 x 1400 mm
800 A
1000 A
1000 A
600 x 2000 x 1400 mm
1200 A
1200 A
Figure 3.11 on page 3-23
Table 3.5 on
Minimum Cabinet Maximum Power
Dimensions Supply Short-Circuit
Current
65 kA
and Figure 3.12 on page 3-23.