SEW-Eurodrive MOVITRAC 07, Системное руководство

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System Manual – MOVITRAC® 07
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BW series braking resistors
Technical Data
Install additional overload protection for the wire and grid resistors by means of a bime-
tallic relay in the –R line (X3). Set the trip current to the value I
F
in the following tables.
Do not use any electronic or electromagnetic fuses since the brief excess currents which
are still permitted may cause them to trip.
If you operate the resistors at rated power, the surfaces of the resistors will get hot. Bear
this aspect in mind when selecting the installation location. For example, a possible lo-
cation is the switch cabinet roof.
The performance data listed in the following tables specify the load capacity of the
braking resistors. The load capacity is dependent on the cyclic duration factor cdf [%]
in relation to a cycle duration of
≤
120 s.
Parallel connection
Two braking resistors must be connected in parallel in the case of some inverter/resistor
combinations. Then set the trip current on the bimetallic relay to twice the I
F
given in the
table.
P
i
f
kVA
Hz
n