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Brake chopper and resistor installation
The installation instructions for the chopper and resistor are given in
Braking Choppers Installation and Start-up Guide
choppers and resistors must be installed outside the drive module in a place where
they will cool.
WARNING! The materials near the brake resistor must be non-flammable.
The surface temperature of the resistor is high. Air flowing from the
resistor is hundreds of degrees Celsius. Protect the resistor against
contact.
Use the cable type used for drive input cabling (refer to chapter
page 119) to ensure the input fuses will also protect the resistor cable. Alternatively,
two-conductor shielded cable with the same cross-sectional area can be used. The
maximum length of the resistor cable(s) is 10 m (33 ft).
Protection
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.
L1
L2
L3
Fuses
1
3
5
2
4
6
ACS800
U1
V1 W1
[3AFY58920541 (English)]. All
1
OFF
2
13
3
ON
14
4
Thermal switch (standard
in ABB resistors)
K1
Resistor braking 147
NBRA-6xx
Technical data
on
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