60
System Manual – MOVITRAC® B
2
BW braking resistors
Technical Data
2.14 BW braking resistors
2.14.1 General information
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.
2.14.2 PTC braking resistors
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" error (error 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)
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
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