Electrical Interfaces

Note

The SD/SDV-Series screwdriver tool is always operated via the SpinBridge.

Direct control of the tool without a SpinBridge is not supported.

This section provides an overview of all electrical interfaces.

Detailed connector pin assignments are provided in:

Supported Control Methods

The SD/SDV-Series can be controlled through the SpinBridge using:

  • Robot-integrated software (e.g. URCap, Kassow CBun)

  • I/O control (for other robots or PLC systems)

System Interfaces

Power and communication between the SD/SDV-Series tool and the SpinBridge are established via two separate cables:

  • Communication cable (M12, 8-core, shielded)

  • Power cable (M12, 4-core, shielded)

The communication cable provides:

  • 24V supply for tool control electronics

  • RS485 communication between tool and SpinBridge

  • Transmission of safety-related signals

The power cable provides:

  • 48V supply for the screwdriver motor

Supplied Cables

The following cables are included with the SD/SDV-Series:

  • 1 × M12 8-core shielded communication cable (5 m)

  • 1 × M12 4-core shielded power cable (5 m)

It is recommended to use the supplied CAT6 Ethernet cable for communication between the SpinBridge and the robot controller.

The SpinBridge is powered via an IEC C13 connector.

Electrical Reference and Grounding

The SpinBridge is connected to protective earth (PE) via the 230V power input and internal chassis connection.

Important

The SpinBridge must always be connected to a properly grounded power supply (PE).

Only the supplied or equivalent grounded power cable shall be used.

Important

The robot and tool must be properly grounded.

The robot flange shall have a reliable electrical connection to protective earth (PE).

Warning

The system must not be operated without proper grounding.

Missing protective earth (PE) may result in:

  • Unstable communication

  • EMC issues

  • Unexpected system behavior

Signal Reference (0V)

The SD/SDV-Series system uses multiple voltage domains:

  • 24V for tool control electronics (internal, derived from 48V)

  • 24V for I/O and safety signals (external, provided by robot/PLC)

  • 48V for motor power

The I/O module is galvanically isolated from the internal electronics of the SpinBridge.

To ensure correct signal behavior:

  • The robot or PLC must supply 24V and 0V for I/O and safety

  • This establishes a common reference potential between systems

Important

A shared 0V reference between the SpinBridge and the robot/PLC is required for correct operation of I/O and safety signals.

Communication Interface (RS485)

Communication between the tool and SpinBridge is based on RS485.

  • Half duplex communication

  • Point-to-point architecture (1 master, 1 slave)

  • Internal termination (120 Ω in both ends)

Important

The RS485 interface is not designed for multi-drop configurations.

Warning

Modifying or extending the communication cable, or routing signals through intermediate connectors (e.g. tool changers), may result in communication failure.

Safety Interface (OSSD)

The safety interface is implemented separately from the standard I/O and is available on a dedicated connector on the SpinBridge.

  • Dual-channel OSSD outputs (OSSD1 and OSSD2)

  • Short-circuit monitored

  • Pulse-tested signals

The safety interface is powered by the robot or PLC (24V / 0V).

Note

Refer to Connecting Safety to Robot or PLC for detailed wiring and safety requirements.

Digital I/O Interface

The SpinBridge provides a 24V industrial digital I/O interface.

  • Inputs support IEC 61131-2 types 1, 2, and 3

  • Outputs are high-side (sourcing) outputs

The I/O interface can be used for:

  • Tool control

  • Status signaling

  • Integration with external systems

Note

The I/O module is galvanically isolated from internal electronics and powered by the robot or PLC.

Shielding and EMC

The system has been tested for EMC compliance (emission and immunity).

To ensure reliable operation:

  • Communication cables must be shielded

  • The cable shield must be connected at both ends

  • Power and signal cables should be routed separately

Important

Only shielded cables shall be used for communication and safety signals.

Note

Improper cabling or grounding may result in unstable communication or unexpected system behavior.

Note

The product is designed and tested in accordance with applicable EMC standards for industrial environments.

A complete list of applied standards is provided in Applied Standards.

Important

Proper shielding and grounding are required to maintain compliance with EMC standards.

Common Electrical Mistakes

The following issues are the most common causes of malfunction:

Missing ground (PE) - SpinBridge not connected to protective earth - Robot flange not properly grounded

Incorrect communication cable - Use of non-shielded cables - Modified or rewired cables - Routing through tool changers without proper shielding

Missing 0V reference - No shared reference between robot/PLC and SpinBridge

Incorrect safety wiring - Only one OSSD channel connected - Missing 24V supply - Connection to non-safety inputs

Warning

These issues may result in unstable behavior, loss of communication, or failure of safety functions.