
28 Operation principle and hardware description
Main circuit
The main circuit of the drive is shown below.
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 the surplus energy from the intermediate DC circuit of the
drive to the brake resistor when necessary. The chopper operates when the DC link
voltage exceeds a certain maximum limit. The voltage rise is typically caused by
deceleration (braking) of a high inertia motor. User obtains and installs the brake
resistor when needed.
L1
L2
L3
T1/U
T2/V
T3/W
ACS880-01
R- UDC+ UDC-
R+
1
2
3
4
ACS880-01 HW.book Page 28 Monday, July 1, 2013 4:51 PM
Summary of Contents for ACS880-01 Series
Page 4: ...ACS880 01 HW book Page 4 Monday July 1 2013 4 51 PM...
Page 12: ...12 ACS880 01 HW book Page 12 Monday July 1 2013 4 51 PM...
Page 20: ...20 Safety instructions ACS880 01 HW book Page 20 Monday July 1 2013 4 51 PM...
Page 26: ...26 Introduction to the manual ACS880 01 HW book Page 26 Monday July 1 2013 4 51 PM...
Page 80: ...80 Planning the electrical installation ACS880 01 HW book Page 80 Monday July 1 2013 4 51 PM...
Page 96: ...96 Electrical installation 8b R8 R9 ACS880 01 HW book Page 96 Monday July 1 2013 4 51 PM...
Page 98: ...98 Electrical installation 16 13 R8 R9 ACS880 01 HW book Page 98 Monday July 1 2013 4 51 PM...
Page 118: ...118 Start up ACS880 01 HW book Page 118 Monday July 1 2013 4 51 PM...
Page 120: ...120 Fault tracing ACS880 01 HW book Page 120 Monday July 1 2013 4 51 PM...
Page 131: ...Maintenance 131 3 4 5 3 ACS880 01 HW book Page 131 Monday July 1 2013 4 51 PM...
Page 172: ...172 Technical data ACS880 01 HW book Page 172 Monday July 1 2013 4 51 PM...
Page 196: ...196 Dimension drawings ACS880 01 HW book Page 196 Monday July 1 2013 4 51 PM...
Page 209: ...Safe Torque off function 209 Certificate ACS880 01 HW book Page 209 Monday July 1 2013 4 51 PM...
Page 210: ...210 Safe Torque off function ACS880 01 HW book Page 210 Monday July 1 2013 4 51 PM...
Page 220: ...220 Resistor braking ACS880 01 HW book Page 220 Monday July 1 2013 4 51 PM...