214
Operating Instructions – MOVITRAC® B
8
Technical data for braking resistors, chokes and filters
Technical data
8.3
Technical data for braking resistors, chokes and filters
8.3.1
Braking resistors
BW braking resis-
tors
General informa-
tion
BW braking resistors are adapted to the MOVITRAC
®
B inverter series. The type of
cooling is KS = self-cooling (air ventilation).
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. As a rule, braking resis-
tors are therefore mounted on the control cabinet roof.
Plan for a load derating of 4 % per 10 K from an ambient temperature of 45 °C (113 °F).
Do not exceed the maximum ambient temperature of 80 °C (176 °F). Note the maximum
permissible temperature of other components (e.g. MOVITRAC
®
B) when installing
braking resistors in the control cabinet.
UL and cUL
approval
Type BW.. braking resistors are UL and cUL approved in conjunction with MOVITRAC
®
B frequency inverters. SEW-EURODRIVE will provide certification on request. The
BW..-T and BW..-P braking resistors have cRUus approval independent of the
MOVITRAC
®
B inverter.
PTC braking resis-
tors
Observe the following points for PTC braking resistors:
• Only recommended for applications with little regenerative energy.
• The resistor reversibly protects itself against overload by changing abruptly to high
resistance and no longer consuming any more energy.
The inverter then switches off and signals a "brake chopper" fault (fault
F04
).
Assignment of the PTC braking resistors:
186415755
Braking resistor type
BW1
BW2
BW3
BW4
Part number
822 897 3
823 136 2
823 598 8
823 599 6
Ambient temperature
ϑ
A
-25 °C to +60 °C
For MOVITRAC
®
B
0003 – 0040 (400/500 V)
0003 – 0022 (230 V)
P
i
f
kVA
Hz
n
Summary of Contents for Movitrac B
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