EA180 Series Servo Drive Users Manual 1.2.4 Block diagram of EA180 servo drive Power Supply Single/three-phase AC220V Three-phase AC380V External braking resistor + P D C Servo drive IGBT module Cooling fan L1 Servo motor L2 Rectifying circuit Electrolytic capacitor U M L3 not used L3 V for single phase W L1C Control power supply +15V +5V +3.3V Enco L2C IGBT drive Protection circuit der +24V To DSP Position control Speed control Current control PWM A/ D External speed Current signal processing External torque Position pulse CN4 Encoder CN5 A, B, Z outputs Digital input signal processing Digital output Operation panel RS232 RS485 CN2/ CN3 Analog output D/A CN1 11 Internal braking resistor CHAR GE Retrogradation processing circuit DSP