WEG MW500 User Manual - page 18
12 | MW500
Installation and Connection
- English -
I
eficaz
= I
max
. t
br
(min)
√ 5
Where: t
br
corresponds to the sum of the braking actuation times during the most
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 DC+ and BR (X3).
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 drive, consider its energy
when dimensioning the ventilation of the cabinet.
DANGER!
The internal braking circuit and the resistor may be damaged if the latter is
not properly dimensioned and/or if the voltage of the input power supply
exceeds the maximum permitted value. In order to avoid the destruction of
the resistor or risk of fire, the only guaranteed method is the inclusion of a
thermal relay in series with the resistor and/or a thermostat in contact with
its housing, connected so as to disconnect the input power supply of the
drive in case of overload, as shown in
figure 3.2
.
Set P0151 to the maximum value when using dynamic braking.
The voltage level on the DC bus for activation of the dynamic braking is defined by
parameter P0153 (level of the dynamic braking).
Refer to the MW500 programming manual.