Power Connections; Input Connections - WEG CFW701 User Manual

Installation and Connection
Input fuses
The fuses to be used at the input must be HS (High-Speed) type with I
„
value indicated in the
page 153 (consider extinction current value in cold situation (it is not the fusion value)), to
protect the inverter diode rectifiers and input wiring.
In order to meet UL requirements, use class J fuses at the inverter supply with a current not
„
higher than the values presented in
Table B.3 on page 153
Optionally, slow blow fuses can be used at the input. They shall be sized for 1.2 x the rated
„
input current of the inverter. In this case, the installation is protected against short-circuit, but
not the inverter input rectifier. This may result in major damage to the inverter in the event of
an internal component failure.

3.2.3 Power Connections

PE
R
S
T
Power
Disconnect
supply
switch
The switch-disconnector is not necessary if the inverter has the DS optional item (with switch-
disconnector).

3.2.3.1 Input Connections

DANGER!
Provide a disconnect device for the input power supply of the inverter.
This device shall disconnect the input power supply for the inverter when needed
(for instance, during servicing).
14 | CFW701
Table B.1 on page 151,
Table B.1 on page
.
PE R S T U V W PE
Fuses
Figure 3.2: Power and grounding connections
Table B.2 on page 152
151, Table B.2 on page 152
Shielding
t equal or lower the
2
and Table B.3 on
and
PE W V U