WEG CFW-11 User Manual page 33

Installation and Connection
ATTENTION!
Sensitive equipment such as PLCs, temperature controllers, and thermal couples shall be kept at a
minimum distance of 0.25 m (9.84 in) from the frequency inverter and from the cables that connect
the inverter to the motor.
DANGER!
Wrong cable connection:
- The inverter will be damaged in case the input power supply is connected to the output terminals
(U/T1, V/T2, or W/T3).
- Check all the connections before powering up the inverter.
- In case of replacing an existing inverter by a CFW-11, check if the installation and wiring is according
to the instructions listed in this manual.
DANGER!
Mauvaise connexion des câbles:
3
- Le variateur sera endommagé si l'alimentation d'entrée est connectée aux bornes de sortie (U/T1,
V/T2 ou W/T3).
- Vérifier toutes les connexions avant de mettre le variateur sous tension
- En cas de remplacement d'un variateur existant par un CFW-11, vérifier si l'installation et le câblage
sont conformes aux instructions figurant dans ce manuel.
ATTENTION!
Residual Current Device (RCD):
- When installing an RCD to guard against electrical shock, only devices with a trip current of 300 mA
should be used on the supply side of the inverter.
- Depending on the installation (motor cable length, cable type, multimotor configuration, etc.),
RCD nuisance trips may occur. Contact the RCD manufacturer for selecting the most appropriate
device to be used with inverters.
NOTE!
The wire gauge values listed in
and the maximum permitted voltage drop shall be considered for the proper wiring sizing.
Input fuses:
Use High Speed Fuses at the input for the protection of the inverter rectifier and wiring refer to
on page 3-13
melting value)) to protect the input rectifier diodes of the inverter and wiring.
In order to meet UL requirements, use class J fuses at the inverter supply with a current not higher than the
values of
Optionally, slow blow fuses can be used at the input they must be sized for 1.2 x the inverter rated input
current. 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.
3-12 | CFW-11
Table 3.2 on page 3-13
for selecting the appropriate fuse rating (consider the cold current extinction value (not the
Table 3.4 on page 3-17.
are orientative values. Installation conditions
Table 3.2