Selecting the brake resistor cables
Use a shielded cable with the same conductor size as for drive input cabling (see
section Terminal and lead-through data for the power cables on page 143). The
maximum length of the resistor cable(s) is 5 m (16 ft).
Placing the brake resistor
Install all resistors 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 of
hundreds of degrees Celsius. Protect the resistor against contact.
Protecting the system in brake circuit fault situations
Protection of the system in cable and brake resistor short-circuit situations
For short-circuit protection of the brake resistor connection, see Brake resistor
connection on page 146. Alternatively, a two-conductor shielded cable with the same
cross-sectional area can be used.
Protection of the system in brake resistor overheating situations
The following setup is essential for safety – it interrupts the main supply in fault
situations involving chopper shorts:
• Equip the drive with a main contactor.
• Wire the contactor so that it opens if the resistor thermal switch opens (an
overheated resistor opens the contactor).
Below is a simple wiring diagram example.
L1 L2 L3
Fuses
1 3 5
2 4 6
ACS150
Q
Thermal switch of the resistor
K1
U1 V1 W1
Electrical installation
For the brake resistor connections, see the power connection diagram of the drive
on page 41.
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