KEB COMBIVERT F4-S Serie Manual De Instrucciones página 65

Circuito de potencia
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Attention Fire Risk!
Connection of the
braking resistor
In order to detect the overheating of a braking resistor it is absolutely
necessary to monitor the temperatur switch. The overheating can have
following causes:
ramps too short or the operation-time too long
incorrect dimensoning of the braking resistor
input voltage too high
defect of braking transistor in the inverter or the braking module
The disconnection of the mains voltage offers the only protection in the
case of a defective braking transistor (see diagram).
Braking resistors can develop a very high surface temperature, therefore
install as safe-to-touch as possible!
+/PA, PB Terminals for the braking resistor
during release of the temperature monitoring the input voltage is
switched off
U
230 or 24 V AC/DC
drive
A simplified protection is achieved, if the links of the temperature sensor
are integrated into the temperature detection in accordance with following
drawing. This measure does not protect with a defect of the braking
transistor however against the developing extreme overload with acute
danger of fire.
PA
PB
= 90°C
OH1
OH2
at 24 V AC/DC
check tripping
L1
L2
L3
+/PA
--
PB
U
V
W
OH
O H
GB - 27
GB

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Combivert f4-c serieCombivert f4-f serie

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