Product Description:

Beckhoff supplies the AX5801 as a safety expansion within the AX Digital Servo Drives series. Installed next to the power stage of an AX servo axis, it provides drive-integrated emergency stop capability by supervising internal relay contacts and switching motor power to a controlled off state. The module is intended for machines that require certified stop functions operating directly through the drive rather than through extensive external wiring. Its integration with the servo axis also keeps safety control close to the motor power stage, reducing the number of separate components needed in the control system.

The circuitry draws only 50 mA from the control supply while energizing two relays with coils rated at 24 VDC. Each relay contact uses positively driven operation, meaning a mechanical linkage prevents a welded contact from being masked during monitoring. Feedback to the drive is provided by potential-free contacts, so downstream logic receives an electrically isolated signal. The contact set can carry up to 0.35 A of feedback current without damage. The board has two monitoring channels and two relay outputs, allowing the drive to evaluate independent safety paths. Connections are made through one 4-pin plug and one 6-pin plug, providing two connection points for the safety and monitoring circuits.

Safety shutdown signaling is wired in series, allowing both channels to open simultaneously when either relay is de-energized. Cable ends require a 10 mm strip length to maintain proper creepage and clearance inside the pluggable terminal housings. When commanded, the card executes the safe torque off function known as STO, which removes torque-producing power from the motor. It can also delay disconnection long enough to support the safe stop 1 deceleration profile known as SS1. This delayed sequence allows the controlled motion to slow before motor torque is disabled, while direct STO operation removes torque without the preceding deceleration interval.