GE A20B-2901-0340/02A Servo Module

This servo module controls axis motion for CNC machine tools. It generates PWM signals for driving servo motors. You will install this board inside the main control cabinet.

Key Technical Specifications

The A20B-2901-0340/02A provides position feedback through incremental encoder inputs. Its internal current loop updates every 62.5 microseconds. The module also includes overcurrent and overtemperature protection circuits.

Parameter	Technical Data
Product Type	CNC Servo Control Module
Control Axes	1 axis (single)
Feedback Type	Incremental encoder (differential)
PWM Frequency	8 kHz typical
Current Loop Update	62.5 µs
Velocity Loop Update	250 µs
Dimensions (L x W x H)	25.0 cm x 18.0 cm x 3.5 cm
Total Weight	0.85 kg (1.87 lbs)
Encoder Connector	1 x 14-pin male header
Motor Connector	1 x 6-pin terminal block
Backplane Connector	1 x 96-pin DIN 41612
Onboard ICs	24 integrated circuits
Energy Storage	1500 µF DC bus capacitance
Operating Temperature	0°C to 55°C

Hardware Architecture and Energy Storage

The A20B-2901-0340/02A uses 1500 µF of DC bus capacitance for energy storage. Twenty-four integrated circuits handle signal processing and logic control. A dedicated DSP chip executes the current loop algorithm at 16 kHz. The module also includes a hardware watchdog timer for safety monitoring.

Interface and Connectivity

One 14-pin header connects the module to an incremental encoder. One 6-pin terminal block sends PWM signals to the servo motor. A 96-pin DIN backplane connector transfers data to the CNC controller. The front panel features LEDs for power and alarm status.

Practical Installation Notes

Install this servo module in a dedicated slot of the CNC rack. The A20B-2901-0340/02A requires proper grounding for noise immunity. Always use shielded cables for encoder and motor connections. Verify the DC bus voltage matches your servo amplifier specifications.