WEG MW500 G2 Manual De Usuario página 22

Installation and Connection
(*) The effective braking current can be calculated as follows:
t
(min)
I = I .
br
effective max √
5
Where: t corresponds to the sum of the braking actuation times during the most severe cycle
br
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.
The resistor braking should not be mounted next to the inverter.
„
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 inverter in case
of overload, as shown in
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.
„
3.2.3.4 Output Connections
ATTENTION!
The inverter has an electronic motor overload protection that must be adjusted
„
according to the driven motor. When several motors are connected to the
same inverter, install individual overload relays for each motor.
The motor overload protection available in the MW500 is in accordance with
„
the UL508C standard. Note the following information:
1. Trip current equal to 1.2 times the motor rated current (P0401).
2. When parameters P0156, P0157 and P0158 (Overload current at 100 %,
50 % and 5 % of the rated speed, respectively) are manually set, the
maximum value to meet condition 1 is 1.1 x P0401.
16 | MW500
Figure 3.2 on page 15.