Dynamic Braking (Standard Built-In For Frame Sizes A, B, C And D And Optional Built-In For Frame Size E - Cfw700 - WEG CFW700 Manual Del Usuario

Installation and Connection
ATTENTION!
In order to be able to use the CFW700 with built-in C3 RFI filter (frame sizes A, B, C
and D with optional RFI filter and all frame size E inverter models – CFW700...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 Figure A.8 on page 208
position of the J1 jumper on the PRT1 board from
to the Figure A.8 on page 208
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).
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 - CFW700...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
Set P0151 and P0185 to their maximum values (400 V or 800 V) when using dynamic braking.
„
The DC link voltage actuation level of the dynamic braking is set by parameter P0153 (Dynamic
„
Braking Level).
16 | CFW700
for inverter frame sizes A, B, C and D and changing the
for inverter frame size E.
212, Table B.2 on page 213
(XE1) to "NC" (XIT), according
symmetrical
rms
and Table B.3 on page 214
Figure 3.3 on page
for
17.