It Networks; Dynamic Braking - WEG MW500 Serie Manual Del Usuario

Installation and Connection
Power supply capacity
The MW500 is suitable for use in a circuit capable of delivering not more than 30.000 A
„
symmetrically (200 V - 480 V).
In case the MW500 is installed in power supplies with current capacity over 30.000 A
„
is necessary to use proper protection circuits for those power supplies, such as fuses or
circuit breakers.

3.2.3.2 IT Networks

ATTENTION!
When inverters with internal RFI filter is used in IT networks (neutral conductor
not grounded or grounded through a high ohmic value resistor), remove
grounding screw XE1, since those kinds of network cause damage to the filter
capacitors of the inverter.

3.2.3.3 Dynamic Braking

Refer to Table B.1 on page 128
current, recommended resistance, effective current (*) and cable gauge.
Input power
supply
R
S
T
Control power
supply
12 | MW500
for the following specifications of the dynamic braking: maximum
Contactor
R
S
T
Thermal
relay
Thermostat
Figure 3.2: Installation of brake resistor
BR
DC+
Brake
resistor
rms
, it
rms