GE A20B-1003-0891/01A Drive Board

This drive board controls motor movement in GE CNC and industrial automation systems. It processes velocity and position commands from the main controller. Therefore, it ensures precise axis motion for machining and manufacturing applications.

Technical Specifications of GE A20B-1003-0891/01A

The GE A20B-1003-0891/01A measures 26.5 cm in length and 19.0 cm in width. Its board weight equals approximately 0.48 kg for straightforward rack mounting. Two 50-pin male connectors link this board to the drive backplane. Additionally, the board includes one 20-pin interface for encoder feedback signals.

Parameter	Specification
Brand	General Electric (GE)
Full Model	A20B-1003-0891/01A
Category	Drive Board (Axis Control)
Dimensions (L x W)	26.5 cm x 19.0 cm (10.43″ x 7.48″)
Board Weight	0.48 kg (1.06 lbs)
Backplane Connectors	2 x 50-pin Male Headers
Feedback Interface	1 x 20-pin Header (Encoder/Resolver)
Controlled Axes	1 Axis per Board (Dedicated)
Control Type	Velocity Loop + Position Loop (PID)
Output Signal Type	±10 VDC Analog Command to Power Amplifier
Velocity Loop Update	250 µs (4 kHz)
Position Loop Update	500 µs (2 kHz)
Encoder Input Format	Quadrature (A, B, Z) with Differential Line Receiver
Maximum Encoder Frequency	500 kHz
Resolver Interface	Optional (External Module Required)
On-Board Components	1 DSP Processor (40 MHz) + 1 FPGA + 4 Op-Amps + 2 ADCs + 1 Temperature Sensor
Memory Resources	32 kB SRAM + 64 kB Flash (Firmware)
Energy Storage	3 x 47 µF Tantalum Capacitors (25V) + 1 x 220 µF Electrolytic (50V)
Operating Voltage	+5 VDC, +12 VDC, -12 VDC, +24 VDC from Backplane
Power Consumption	4.5 W (Typical)
Operating Temperature	0°C to +55°C (32°F to 131°F)
Status Indicators	1 Green LED (Power) + 1 Red LED (Fault)

Energy Storage and Control Stability

The GE A20B-1003-0891/01A stores energy using four onboard capacitors. Three tantalum capacitors filter power for the DSP and FPGA logic circuits. The electrolytic capacitor provides hold-up energy for analog output circuits. Consequently, this board maintains stable servo control during brief power disturbances.

Feedback Processing and Axis Control

This drive board accepts quadrature encoder signals from AC servo motors. A differential line receiver converts these signals into digital position data. The onboard DSP executes PID algorithms for both velocity and position loops. Thus, the board delivers smooth and accurate axis motion control.

Installation and Diagnostic Indicators

You will find two green LEDs near the board’s top edge. A green LED illuminates when the +5V logic supply is present. A red LED lights up during overcurrent or encoder fault conditions. The board also features four mounting holes for secure rack attachment. Thus, it fits seamlessly into any standard GE drive rack slot.