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

Installation and Connection
AC power supply considerations
The CFW700 inverters are suitable for use on a circuit capable of deliviering up to a maximum
of 100,000 A symmetrical (240 V / 480 V).
rms
In case the CFW700 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.
rms
3.2.3.2 Dynamic Braking (standard built-in for sizes A, B, C and D and optional
built-in for size E - CFW700...DB...)
Refer to tables B.1 and B.2 for 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 figure 3.3.
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).
Contactor
Power
supply
Control power
supply
Figure 3.3: Connection of the braking resistor
18 | CFW700
R
S
T
Thermal
relay
Thermostat
- English -
CFW700
BR DC+
Braking
resistor