A8 Series AC Servo Driver

Product Overview

This series is a high-performance AC servo driver, integrating the STO (Safe Torque Off) safety torque off function, compliant with IEC 61800-5-2 safety standards, capable of achieving safe shutdown in emergency situations. The system supports full closed-loop control mode, achieving positioning accuracy of ±1 pulse through high-resolution encoder feedback, compatible with rotary motors and linear motor applications. Equipped with a Type-C debugging interface, it supports real-time parameter configuration and has a built-in RS485 communication interface (Modbus RTU protocol), with an adjustable baud rate range of 9.6 kbps to 115.2 kbps. It uses Field Oriented Control (FOC) algorithm, suitable for high dynamic response scenarios such as precision CNC and semiconductor equipment.

Features

1. Support 17/23-bit incremental and absolute value encoders 2. Support 7 control modes: position, velocity, torque, position/torque, position/velocity, velocity/torque, position/velocity/que; 3. Support ABZ phase frequency division feedback 4. Support motor self-learning function: match different manufacturers' motors

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Driver Specifications

Input Power	Single-phase 220VAC / Three-phase 220V
Operating Environment	Temperature	0~45 ℃
	Humidity	≤90%RH without condensation
	Altitude	Altitude ≤1000mm
	Installation Environment	No corrosive gases, flammable gases, oil mist, or dust
	Installation Method	Vertical Installation
External Encoder CN3		Supports Linear Motor Supports Full Closed-loop Mode, can connect to Grating/Magnetic Encoder Only supports differential input type encoder
Encoder CN4		Supports 17-bit incremental/absolute encoder, 23-bit incremental/absolute encoder
Output Power	24V Voltage Output	100mA, can power DI port and pulse port.
Control Signals	Digital Inputs	8 channels of general digital inputs, configurable functions.
Control Signals	Digital Outputs	6 channels of digital outputs, configurable functions.
Pulse Signals	Input	2 channels of high-speed input: supports up to 1MHz pulse, 50% duty cycle. Supports pulse input modes: PULS+DIR, A+B, CW+CCW
Pulse Signals	Output	3 channels of high-speed pulse output, output signal form: 5V differential signal. 1 channel Z signal single-ended output.
Analog Signals	Input	2 channels of analog input, 12-bit resolution, input range -9.5 to +9.5V. AI2 is fixed as torque limit input.
Analog Signals	Output	None
STO Safety Function		2 channels of STO input
Communication Functions		RS485 communication, ModbusRTU protocol.
Display Panel and Button Operation		5 buttons (Mode, Set, Left, Up, Down) and 6 digital tubes
Regenerative Braking Resistor		Built-in 50W 40Ω braking resistor. External braking resistor required for frequent braking scenarios.

Product Diagram

Driver Naming Rules

Main Circuit Terminal Definitions

(1) Main Power Terminals

Number	Signal Definition	Function
1	L1	Power terminal, can connect to single-phase 220V AC or three-phase 220V AC
2	L2
3	L3

(2) Control Power Terminals

Number	Signal Definition	Function
1	L1c	Power terminal, can connect to single-phase 220V AC
2	L2c	Power terminal, can connect to single-phase 220V AC

(3) Braking Resistor Terminals

Number	Signal Definition	Function	Description
1	B1	DC bus positive output DCP	Built-in resistor positive terminal connected to B1. When using built-in resistor, short B2 and B3. When using external resistor, connect resistor between B1 and B2 (B2 and B3 must be disconnected).
2	B3	Built-in braking resistor negative output
3	B2	Braking transistor collector output

(4) Power Terminals

Number	Signal Definition	Function
1	U	Connect to motor U phase
2	V	Connect to motor V phase
3	W	Connect to motor W phase
4	PE	Connect to motor casing

Driver Wiring Diagram

Note:

① When connecting single-phase 220V power, connect live and neutral wires to L1, L3; L2 does not need wiring;

② When STO function is not used, STO1 and STO2 need to be connected to COM, otherwise Er.300 alarm will occur;

③ When connecting linear motor, do not connect CN4 encoder terminal; connect encoder to CN3 encoder terminal, supports ABZ differential signal encoder, does not support communication type encoder;

MODBUS Bus Communication

The A8 series servo driver has MODBUS bus communication function, allowing control of servo position/speed/torque via controllers with MODBUS function, supporting up to 32 control stations, greatly saving controller costs.

Item	Specification
Communication Protocol	MODBUS RTU
Bus connection	RJ45 (CN3, CN4)
Baud rate	2400bps, 4800bps, 9600bps, 19200bps, 38400bps, 57600bps
Number of stations	Up to 32 (the last station requires short-circuiting the terminal resistor jumper)