Dynamic Braking (Standard Built-In For Frame Sizes A, B, C And D And Optional Built-In For Frame Size E - Cfw701 - WEG CFW701 Manual Del Usuario

ATTENTION!
The power supply that feeds the inverter shall have a solid grounded neutral.
In case of IT networks, follow the instructions described below.
ATTENTION!
In order to be able to use the CFW701 with built-in C3 RFI filter (CFW701...
C3...) in IT networks (neutral conductor not grounded or grounded via a high
ohmic value resistor) or in corner-grounded delta systems, it is necessary to
remove some RFI filter components (capacitor for frame sizes A, B, C and
D and capacitor and the MOV for frame size E) connected to the ground by
removing the screws indicated in
sizes A, B, C and D and changing the position of the J1 jumper on the PRT1
board from
for inverter frame size E.
AC power supply considerations
Suitable for use on a circuit capable of delivering not more than 100.000 A
„
Ampères at 240 V, 480 V or 600 V maximum, when protected by Class J fuses (for 240 V
and 480 V models) or special purpose fuses (for 600 V).
In case the CFW701 is installed in power supplies with current capacity higher than 100.000 A
„
it is necessary to provide adequate protections circuits such as fuses or switches.
3.2.3.2 Dynamic Braking (standard built-in for frame sizes A, B, C and D and
optional built-in for frame size E - CFW701...DB...)
Refer to Table B.1 on page
the following dynamic braking specifications: maximum current, resistance, RMS current and
cable gauges.
The power rating of the dynamic braking resistor is a function of the deceleration time, the load
inertia and the resistant torque.
Dynamic braking installing procedure:
Install the braking resistor between the power terminals DC+ and BR.
„
Use twisted cable for the connection. Separate these cables from the signal and control
„
cables.
Size the cables according to the application, respecting the maximum and effective currents.
„
If the braking resistor is installed inside the inverter cabinet, consider its additional dissipated
„
energy when sizing the cabinet ventilation.
The thermal protection of the dynamic braking resistor must be provided externally using a
„
thermal relay in series with the resistor and/or a thermostat in contact with the resistor frame,
connected so as to switch the input power supply of the inverter, as shown in
page 16.
Figure A.6 on page 142
(XE1) to "NC" (XIT), according to the
148, Table B.2 on page 149
Installation and Connection
for inverter frame
Figure A.6 on page 142
symmetrical
rms
and Table B.3 on page 150
Figure 3.3 on
CFW701 | 15
,
rms
for