WEG CFW500 Serie Manual Del Usuario página 19

Refer to table B.1 for the following specifications of the dynamic braking: maximum
current, resistance, effective current (*) and cable gauge.
Input Power
supply
Command
power supply
(*) The effective braking current can be calculated as follows:
t
(min)
I = I .
br
effective max √
5
seeing that: t corresponds to the sum of the braking actuation times during the most
br
severe cycle of five minutes.
The power of the brake resistor must be calculated considering the deceleration time,
the inertia of the load and of the resistive torque.
Procedure to use the dynamic braking:
Connect the brake resistor between the power terminals +Ud and BR.
„
Use a twisted cable for the connection. Separate these cables from the signal and
„
control wiring.
Dimension the cables according to the application, observing the maximum and
„
effective currents.
If the brake resistor is mounted within the cabinet of the inverter, consider its energy
„
when dimensioning the ventilation of the cabinet.
Contactor
relay
Thermostat
Figure 3.2: Installation of brake resistor
- English -
Installation and Connection
R
S
T
BR +Ud
Brake
resistor
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