System Manual – MOVIDRIVE® compact Drive Inverters
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Braking resistors type BW... / BW...-T / BW...-P
Technical Data and Dimension Drawings
2.14
Braking resistors type BW... / BW...-T / BW...-P
General
information
•
Braking resistors BW... / BW...-T and BW...-P are adapted to the technical charac-
teristics of MOVIDRIVE
®
drive inverters.
•
Plan for a reduction of power of 4 % per 10 K below an ambient temperature of
45 °C. Do not exceed a maximum ambient temperature of 80 °C.
Flat-type braking
resistors
•
Protection against contact (IP54)
•
Internal thermal overload protection (non-replaceable fuse)
•
Touch guard and mounting rail attachment available from SEW as accessories
Wire and grid
resistors
•
Perforated sheet cover (IP20) open to mounting surface
•
The short-term load capacity of the wire and grid resistors is higher than in the flat-
type braking resistors (
→
MOVIDRIVE
®
compact
system manual, section "Selecting
the braking resistor")
•
A temperature switch is integrated in the BW...-T braking resistor
•
A thermal overcurrent relay is integrated in the BW...-P braking resistor
SEW-EURODRIVE recommends implementing additional protection against overload
for the wire and grid resistors by using a bimetallic relay with trip characteristics of trip
class 10 or 10A (in accordance with EN 60947-4-1). Set the trip current to the value I
F
(
→
following tables). Do not use electronic or electromagnetic fuses because these can
be triggered even in case of short-term excess currents that are still within the tolerance
range.
For braking resistors in the BW..-T / BW...-P series, you can connect the integrated tem-
perature sensor using a 2-core, shielded cable as an alternative to a bimetallic relay.
The BW...-T and BW...-P braking resistors can be connected from the front or the back
(
→
dimension drawing for BW... / BW...-T / BW...-P braking resistors). Use filler plugs
for tapped holes that are not connected.
The resistor surfaces will get very hot under a load of P
N
. Make sure that you select an
installation site that will accommodate these high temperatures. Braking resistors are
usually mounted on the control cabinet roof.
The performance data listed in the tables below shows the load capacity of the braking
resistors according to their cyclic duration factor (cyclic duration factor = cdf of the brak-
ing resistor in % in relation to a cycle duration
≤
120 s).
UL and cUL
approval
Type BW... braking resistors are UL and cUL approved in conjunction with
MOVIDRIVE
®
compact
drive inverters. SEW-EURODRIVE can provide proof of appro-
val on request. The BW...-T and BW...-P braking resistors have cRUus approval in-
dependent of the MOVIDRIVE
®
inverters.
P
i
f
kVA
Hz
n
Summary of Contents for MOVIDRIVE compact MCH41A
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