ABB ACS800 Application Manual page 26

26
The energy pulse withstands E
table:
Note: Always connect the biggest converter to the main supply. If the charging circuit
of the biggest converter is not capable of delivering the demanded charging energy,
connect also the next biggest converter to the main supply.
Example 4
The DC buses of three converters ACS800-0060-3 (R5), ACS800-0120-3 (R6) and
ACS800-0170-3 (R7) are connected together. The main supply voltage is 400 V. The
total charging energy of the capacitors is
E
tot
The charging resistor of the ACS800-0170-3 (R7) is able to withstand the whole
charging energy, E
Example 5
The DC buses of converters ACS800-0120-5 (R6), ACS800-0260-5 (R7) and
ACS800-0400-5 (R8) are connected together. The main supply voltage is 500 V. The
total charging energy of the capacitors is
E
tot
Even if the charging resistor of the ACS800-0260-5 (R7) is able to withstand the
whole charging energy, E
ACS800-0400-5 (R8) is connected to the main supply.
Appendix A Charging circuit capacity
Frame size:
R5
R6
R7 (230...500 V)
R7 (690 V)
R8
1
⋅ (
-- -
= 2400uF + 4700uF
2
= 1866 J < E
tot
1
⋅ (
-- -
= 4700uF + 5700uF
2
of the charging circuits are listed in the following
r
E
r
1000
2000
5600
2800
5600
) ⋅ (
+ 5700uF 1.35 400V
= 5600 J.
r
) ⋅ (
+ 10800uF 1.35 500V
= 4829 J < E = 5600 J, the biggest converter
tot r
/ J
2 6 –
⋅ ) ⋅
10 =
2 6 –
⋅ ) ⋅
10 =
1866J
4829J