ABB ACS 800 Series, Hardware Manual

Page: 96 / 101

96
Resistor Braking
• The resistance does not restrict the braking capacity needed, i.e.,

where
• The heat dissipation capacity (E
R
) is sufficient for the application (see step 3
above).
Optional Brake Chopper and Resistor(s) for the ACS800-U2, ACS800-U4,
ACS800-PC and ACS800-07/U7
The nominal ratings for dimensioning the brake resistors for the ACS800-U2,
ACS800U4, ACS800-PC and ACS800-07/U7 are given below at an ambient
temperature of 40 °C (104 °F).
Resistor Installation and Wiring
All 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 of
hundreds of degrees Celsius. Protect the resistor against contact.
Use the cable type used for drive input cabling (refer to chapter Technical Data) 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). For the connections, see the
power connection diagram of the drive.
P
max
maximum power generated by the motor during braking
U
DC
voltage over the resistor during braking, e.g.,
1.35 · 1.2 · 415 VDC (when supply voltage is 380 to 415 VAC),
1.35 · 1.2 · 500 VDC. (when supply voltage is 440 to 500 VAC) or
1.35 · 1.2 · 690 VDC (when supply voltage is 525 to 690 VAC).
R resistor resistance (ohm)
ACS800 type Duty Cycle=3s on, 27s off Duty Cycle=10s on, 50s off Duty Cycle=30s on, 180s off
kVA Frame Part No Rohm Watts Part No Rohm Watts Part No Rohm Watts
0170-5 R7 ABB-48431-271 2.9 14.2k ABB-48431-272 2.9 16.3k ABB-48431-273 2.9 23.5k
0210-5 R7 ABB-48431-271 2.9 14.2k ABB-48431-273 2.9 23.5k ABB-48431-274 2.9 29.0k
0260-5 R7 ABB-48431-271 2.9 14.2k ABB-48431-273 2.9 23.5k ABB-48431-274 2.9 29.0k
0320-5 R8 ABB-48431-331 2.2 17.8k ABB-48431-332 2.2 26.6k ABB-48431-334 2.2 40.1k
0400-5 R8 ABB-48431-393 1.7 24.5k ABB-48431-395 1.7 46.3k ABB-48431-396 1.7 58.1k
0440-5 R8 ABB-48431-480 1.2 32.7k ABB-48431-482 1.2 60.8k ABB-48431-484 1.2 81.1k
0490-5 R8 ABB-48431-514 1.0 34.2k ABB-48431-517 1.0 67.6k ABB-48431-518 1.0 90.0k
0550-5 R8 ABB-48431-514 1.0 34.2k ABB-48431-517 1.0 67.6k ABB-48431-518 1.0 90.0k
0610-5 R8 ABB-48431-515 1.0 40.0k ABB-48431-518 1.0 90.0k ABB-48431-518 1.0 90.0k
P
max <
U
DC
R
2