Resistor braking
135
Protection of frame sizes R2 to R5
It is highly recommended to equip the drive with a main contactor for safety reasons.
Wire the contactor so that it opens in case the resistor overheats. This is essential
for safety since the drive will not otherwise be able to interrupt the main supply if the
chopper remains conductive in a fault situation.
Below is a simple example wiring diagram.
ACS800
U1
V1 W1
L1 L2 L3
1
2
3
4
5
6
13
14
3
4
1
2
K1
Θ
Fuses
OFF
ON
Thermal switch (stand-
ard in ABB resistors)
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