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26 Operation principle and hardware description
￭
Simplified main circuit diagram
L1
L2
L3
1
Rectifier. Converts alternating current and voltage to direct current and voltage.
2
DC link. DC circuit between rectifier and inverter.
3
Inverter. Converts direct current and voltage to alternating current and voltage.
4
Brake chopper. Conducts energy from the intermediate DC circuit of the drive to the
brake resistor when it is necessary and if an external brake resistor is connected to
the drive. The chopper operates when the DC link voltage exceeds a certain maximum
limit. The voltage rise is typically caused by deceleration (braking) of a motor. The user
obtains and installs the brake resistor when necessary. (exist only on frame size R2...R4)
5
DC connection (UDC+, UDC-). (exist only on frame size R2...R4)
Product variants
The product has two primary variants:
•
Standard variant (ACS180-04S-...) which has integrated Safe torque off (STO)
and category C2, C3 or C4 EMC level (C2 for ...-1 type, C3 for ...-4 type, C4 for
...-2 type).
•
Base variant (ACS180-04N-...) which has category C4 EMC level (no internal
EMC filter) and no integrated STO.
2
1
4
R-
R+
UDC+ UDC-
3
5
T1/U
T2/V
T3/W
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