￭
Overview circuit diagram of the drive
M
3~
1
2
3
4
6
8
12
13
77
6
5
10
9
11
AC supply
*Main switch-disconnector (Q1.1)1
*AC fuses.2
Frames 1×D8T + 2×R8i (6-pulse), 2×D7T + 2×R8i (12-pulse), 2×D8T + n×R8i(12-pulse) have AC
fuses installed in the incoming cubicle (ICU) only. Frames 2×D8T + 2×R8i and above (6-pulse)
and 4×D8T + n×R8i (12-pulse) have AC fuses installed for each supply module in the supply
module cubicle(s). Additional common AC fuses are installed in the incoming cubicle (ICU) if
optional main contactor (+F250) is present.
*Main contactor (Q2.1). Optional (+F250) with frames 2×D7T + 2×R8i, 2×D8T + 2×R8i and
2×D8T + 3×R8i. 12-pulse units have two contactors (Q2.1 and Q2.2).
3
*With larger units, an air circuit breaker is either optional (+F255) or standard, replacing items 1…3.
Each supply module has dedicated AC fuses installed in the supply module cubicle(s).
Supply module. Converts alternating current and voltage to direct current and voltage.4
The module contains an AC input choke.
The ACS880-07 has 1…4 supply modules connected in parallel. 12-pulse units have either one
or two supply modules per each 6-pulse supply line.
DC bus5
Inverter DC fuses6
Inverter module. Converts direct current and voltage to alternating current and voltage. The
ACS880-07 has 2…5 inverter modules connected in parallel.
7
Motor8
**Brake chopper DC fuses9
**Brake chopper. Conducts surplus energy from the intermediate DC circuit of the drive to the
brake resistor when necessary. The chopper operates when the DC voltage exceeds a certain
maximum limit.The voltage rise is typically caused by deceleration (braking) of a high inertia
motor.
10
**Brake resistors11
**Brake chopper (+D150) and resistors (+D151) are optionally available for frame sizes 1×D8T + 2×R8i
and up. See chapter Resistor braking (page 333).
Auxiliary voltage switch (Q21) with fuses12
32 Operation principle and hardware description
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