The document describes the Siemens SINUMERIK ONE / SINUMERIK 840D sl Emergency Stop Button, an essential safety component for industrial machinery.
Function Description
The emergency stop button is a red mushroom-shaped pushbutton with a yellow ring, designed to immediately halt machine operation in critical situations. A green ring located directly beneath the mushroom pushbutton indicates the current position status of the emergency stop button. When the button is not pressed, the green ring is visible. When pressed, the green ring is not visible.
The primary function of the emergency stop button is to ensure the safety of personnel and prevent damage to machines or workpieces. When activated, it typically brings all drives to a standstill with maximum braking torque. The specific response to an emergency stop may vary and should be detailed in the machine tool manufacturer's instructions.
It is crucial that the emergency stop button is only released, and the monitored system returned to operation, after the condition that triggered the emergency stop function has been corrected and a safe restart is ensured. Premature unlocking can lead to a risk of death.
The emergency stop circuit typically involves normally closed (NC) contacts that open when the button is pressed, interrupting the control circuit and initiating the emergency stop sequence. Contact blocks with various contact configurations are available under the name 'RAFIX 22 QR, contact block'. The specific contact block described in this manual includes two contacts: one normally open (NO) contact and one normally closed (NC) contact, with screw terminals.
Important Technical Specifications
The emergency stop button and its associated contact blocks are designed for robust industrial use. Key technical specifications include:
- Rated Voltage: 24 V DC
- Rated Operational Current Ie, DC-13 Q300: 24 V DC / 2.75 A (according to IEC 60947)
- Rated Insulation Voltage AC / DC: 400 V DC (according to IEC 60947)
- Switching Capacity: DC 13 (according to EN 60947-5-1)
- B10 (Pushbutton Unit): 130,000 operations
- B10 (Contact Block, 24 V DC / 1A): 500,000 operations
The B10 value indicates the number of operations after which 10% of the components are expected to have failed. These values highlight the high reliability and durability of the emergency stop button and its contact blocks.
Usage Features
The emergency stop button is designed for ease of assembly and disassembly, ensuring straightforward installation and maintenance.
Assembly:
- The emergency stop button is inserted into the front plate.
- The groove in the emergency stop button must be aligned with the front plate. This alignment determines whether the switching element is mounted horizontally or vertically. For example, a 90° or 270° groove position results in a vertical contact block position, while a 180° or 360° position results in a horizontal contact block position.
- A metal claw is pushed with its claws towards the front, ensuring the lug of the metal claw is inserted into the groove of the emergency stop button.
- A threaded ring is then screwed onto the thread. The threaded ring grooves should point towards the contact block. An assembly tool, such as a socket wrench with a key width of 26 mm (double-hexagon), can be used. A tightening torque of 1.6 +/- 0.2 Nm must be observed.
- Finally, the pushbutton unit is inserted into the coupling. The two black lugs of the coupling must be aligned with the two grooves of the contact block. A "click" sound confirms a successful connection. The coupling can also be connected rotated 180° with the pushbutton unit.
Disassembly:
- To remove the pushbutton unit from the coupling, the white lever on the coupling must be pushed outwards, and the pushbutton unit pulled out.
- The remaining disassembly steps are performed in the reverse order of assembly.
Mounting of Contact Blocks:
- The actuating element is fastened in the front plate using the threaded ring and the metal claw.
- The contact block is inserted into the coupling and snapped into place.
- Cables are then connected to the contact block.
Disassembly of Contact Blocks:
- Cables are removed from the contact block.
- The locking lever of the coupling is loosened with a screwdriver, and the contact blocks are removed.
- The threaded ring of the actuating element is unscrewed to detach the actuating element from the front plate.
Maintenance Features
The manual emphasizes several safety instructions that are crucial for the maintenance and safe operation of the device:
- Qualified Personnel: Only personnel qualified for the specific task, in accordance with relevant documentation and safety instructions, should operate or maintain the product.
- Proper Use: Siemens products must only be used for applications described in the catalog and technical documentation. Any components from other manufacturers must be recommended or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation, and maintenance are essential for safe and problem-free operation. Adherence to permissible ambient conditions and relevant documentation is mandatory.
- Electrical Safety: When working on electrical devices, only qualified personnel should perform the tasks, adhering to country-specific safety rules. This includes preparing for disconnection, isolating the drive system, waiting for discharge times, checking for voltage, ensuring auxiliary circuits are de-energized, preventing motor movement, identifying and securing other energy sources, and ensuring the drive system is completely locked.
- Power Supply: Only power supplies providing SELV (Safety Extra Low Voltage) or PELV (Protective Extra Low Voltage) output voltages should be used for electronics modules to prevent hazardous voltages on exposed components.
- Equipment Damage: Damaged devices should not be used. Limit values specified in technical data for transport, storage, and operation must be observed.
- Cable Shields: Unconnected cable shields can lead to hazardous touch voltages due to capacitive cross-coupling. Cable shields and unused cable cores must be connected at one end to the grounded housing potential.
- Ground Connection: Devices with protection class I require a correct protective conductor connection to prevent high voltages on exposed parts.
- Tightening Tools: Only screwdrivers that precisely match screw heads should be used. Screws must be tightened to the specified torque using a torque wrench or a mechanical precision nut runner with a dynamic torque sensor and speed limitation system.
- Fire Prevention: Built-in units must be installed in suitable metal cabinets to protect personnel from fire and smoke. Smoke must escape via controlled and monitored paths. Inadequate ventilation clearances can cause overheating, leading to fire and smoke, and must be avoided by ensuring minimum clearances. Devices should only be operated in admissible mounting positions to prevent overheating.
- Electromagnetic Compatibility: Radio devices or mobile phones used within 20 cm of components can cause malfunctions, impairing functional safety. They should be switched off when close to components.
- ESD Protection: Electrostatic sensitive devices (ESD) can be damaged by electric fields or electrostatic discharge. Electronic components, modules, or devices should only be packed, stored, transported, and sent in original packaging or suitable conductive materials. Personnel must be grounded when handling these components (e.g., with an ESD wrist strap or ESD shoes in conductive areas). Components should only be placed on conductive surfaces.
- Software Manipulation: Software manipulations (viruses, Trojans, worms) can lead to unsafe operating states. Software must be kept up to date, and automation and drive components integrated into a holistic, state-of-the-art industrial security concept. Files on exchangeable storage media should be protected with virus scanners. All security-related settings must be checked after commissioning.
- Recycling and Disposal: For environmentally friendly recycling and disposal, the old device should be handled by a company certified for the disposal of electrical and electronic waste, in accordance with local regulations.
- China RoHS: The products comply with the China RoHS directive, with further information available on the Siemens Industry Online Support (SIOS) website.
These features and guidelines ensure the safe, reliable, and compliant operation and maintenance of the Siemens SINUMERIK ONE / SINUMERIK 840D sl Emergency Stop Button.
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