Operation principle and hardware description27Operation principle and hardware descriptionWhat this chapter containsThis chapter describes the operating principle and construction of the drive modulein short.Product overviewThe ACS850-04 is a drive module for controlling asynchronous AC induction motors,permanent magnet motors and ABB synchronous reluctance motors (SynRMmotors).The main circuit of the drive module is shown below.1 AC choke2 Rectifier. Converts alternating current and voltage to direct current and voltage.3 DC link. DC circuit between rectifier and inverter4 Inverter. Converts direct current and voltage to alternating current and voltage.5 Brake chopper (option +D150). Conducts the surplus energy from the intermediate circuit ofthe drive to the brake resistor when necessary. The chopper operates when the DC linkvoltage exceeds certain maximum limit. The voltage rise is typically caused by deceleration(braking) of a high inertia motor.U1V1W1U2V2W2ACS850-04R-R+42153UDC-UDC+PE
