Resistor braking 179
Installing and wiring brake resistors
All resistors must be installed outside the drive module in a place where they are
cooled sufficiently, do not block the airflow to other equipment, or dissipate hot air into
the air inlets of other equipment.
WARNING! The materials near the brake resistor must be non-flammable.
The surface temperature of the resistor may rise above 200 °C (400 °F), and
the temperature of the air flowing from the resistor is hundreds of degrees
Celsius. Protect the resistor against contact.
The maximum length of the resistor cable(s) is 20 m (65 ft). For the connections, see
Cable routing diagram on page 64.
Contactor protection of drive
The drive must be equipped 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.
ACS880-M04
U1 V1 W1
L1 L2 L3
1
2
3
4
5
6
13
14
3
4
1
2
K1
Θ
Fuses
OFF
ON
Resistor thermal switch
Main contactor
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