SEW-Eurodrive MOVIDRIVE MDA90A-0640-503-X-S00

8
Technical Data
Technical data of braking resistors, filters and chokes
Operating Instructions – MOVIDRIVE
®
modular
238
8.9 Technical data of braking resistors, filters and chokes
8.9.1 Braking resistors type BW.../BW...-T
General
The BW... / BW...-T braking resistors are adapted to the technical characteristics of
the application inverter.
There are braking resistors with different continuous and peak braking power avail-
able.
The braking resistors can be protected against overload and overtemperature by the
customer by using a thermal overload relay. The tripping current is set to the value I
F
,
see the following tables(→2239).
The braking resistors of the series BW...-T are equipped with an integrated tempera-
ture switch that monitors the temperature. If the nominal operating temperature is ex-
ceeded, the temperature switch triggers a signal contact. The temperature switch does
not switch off the braking resistor. This is why the temperature switch must be evalu-
ated to avoid thermal overload of the braking resistor.
Another possibility to protect the braking resistor is the TCB thermal circuit breaker.
The TCB thermal circuit breaker protects the braking resistor against continuous over-
load and power peaks over short periods.
INFORMATION
Use of protection devices
Only use the protection devices listed in the following section:
• TCB thermal circuit breaker
• Internal temperature switch -T
• External bimetallic relay
→ See also chapter "Protection against thermal overload of the braking res-
istor"(→2107).
UL and cUL approval
The listed braking resistors have cRUus approvals independent of the application in-
verter.
24748536/EN – 11/2017