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Selecting the Correct
ACS 600/Chopper/
Resistor Combination
*Selection of the ACS 600 is affected also by other factors (eg. the output power required during
acceleration). See ACS 600 Technical Catalogue for more information on selecting the ACS 600.
Installation and Start-up Guide for NBRA-6xx
1. Calculate the maximum power (P
braking.
2. Select a suitable ACS 600* / braking chopper / braking resistor
combination for the application. The following condition must be met:
P
> P
BRmax
max
See Table 2-1 and Table 2-2 for P
specified for the reference braking cycle (one minute of braking, nine minutes of
rest). If the actual duty cycle does not correspond to the reference cycle, the
maximum allowed braking power P
Maximum Braking Power for the calculation of P
3. Check the resistor selection. The energy generated by the motor
during a 400-second period must not exceed the resistor heat
dissipation capacity E
If the E
value is not sufficient, it is possible to use a four-resistor assembly in which
R
two standard resistors are connected in parallel, two in series. The E
four-resistor assembly is four times the value specified for the standard resistor.
Note: A resistor other than the standard resistor can be used.
However, the following conditions must be met:
• Resistor resistance value must not be below the resistance value of
the standard resistor.
• Resistor resistance value must not restrict the braking capacity
needed. The condition is met when:
2
U
DC
P
max <
R
P
= Maximum power (P
max
braking.
U
= Voltage over the resistor during braking =
DC
1.35 · 1.2 · 415 V d.c. (mains voltage is 380 to 415 V a.c)
1.35 · 1.2 · 500 V d.c. (mains voltage is 440 to 500 V a.c)
1.35 · 1.2 · 690 V d.c. (mains voltage is 525 to 690 V a.c)
R
= Resistor resistance value (ohm)
• Resistor heat dissipation capacity (E
application (see step 3. above).
) generated by the motor during
max
. The P
BRmax
BRmax
must be used instead. See Appendix B –
BR
BR
(see Table 2-1 and Table 2-2).
R
) generated by the motor during
max
) must be sufficient for the
R
Chapter 2 – Overview
values in the tables are
.
value of the
R
2-7
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