Weq CFW500 Serie Manual Del Usuario página 23

Installation and Connection
(*) 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 severe
br
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.
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 value permitted. 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 in such a way to disconnect the input power supply of the inverter
in case of overload, as shown in
DANGER!
Le circuit de freinage du variateur interne et la résistance de freinage peuvent
être endommagés s'ils sont mal dimensionnés ou si la tension de ligne dépasse
la valeur permise maximale.
Dans ce cas, la seule méthode garantie pour éviter une surchauffe de la
résistance de freinage et éliminer le risque d'incendie est l'installation d'un relais
de surcharge thermique en série connecté avec la résistance et.ou l'installation
d'un thermostat sur le corps de la résistance, en le câblant de manière à ce
qu'il déconnecte l'alimentation électrique du variateur en cas de surchauffe,
comme indiqué sur la
Set P0151 at maximum value when using dynamic braking.
„
The voltage level on the DC bus for activation of the dynamic braking is defined by the
„
parameter P0153 (level of the dynamic braking).
Refer to the CFW500 programming manual.
„
18 | CFW500
Figure 3.2 on page
Figure 3.2 on page 17.
17.