Jokab Safety, part of the ABB group of companies, markets a complete range of safety products, which makes it easy to build safety systems. CSE is a leading supplier of ABB’s low voltage equipment in the UK and is able to supply the Jokab Safety range to our customers.
Pluto is an “All-Master” safety PLC concept, that simplifies the design of safety systems and achieves the highest safety level PL e according to EN ISO 13849-1 and SIL 3 according to EN 62061 and EN 61508.
The key difference between Pluto and conventional safety PLC´s is that there is no “Master-Slave” relationship between the control units connected to the safety bus. Each Pluto is a ‘Master’ unit and can see the other Plutos’ inputs and outputs, and can thereby make decisions about its own safety environment. This concept enables simple communication, programming and changes to the safety system. With the use of a ‘Gateway’ device, a Pluto can communicate with other bus systems and thereby form part of a larger network.
The AS-i system is distinguished by its special yellow profile cable. The cable connects all sensors, transducers and actuators on the network to a master system. The component parts of a system can include both non-safe and safe products. This means that both operational and safety related products can be mixed in a network. The bus system drives a Master-Slave (node) configuration where each I/O module corresponds to a common master.
After commissioning the system can always be expanded by adding branches or extensions to the cable. In a similar way, more products can be added, moved or replaced.
Vital safety system
Vital is a safety controller with a dynamic safety circuit that can monitor up to 30 sensors in accordance with the highest safety level.
The Vital module is based upon a dynamic single-channel concept as opposed to conventional dual-channel safety relays.
Most safety components on the market can be connected to the Vital module. Dynamic sensors enable safety PL e to be achieved in a single-channel system. For example ABB Jokab Safety´s dynamic non-contact Eden sensor, Spot light beam and emergency stops (via Tina adaptors) can be used. Even mechanical switches can be connected to Vital with the aid of ABB Jokab Safety´s Tina adaptors.
Vital has selectable manual or automatic resetting and dual outputs.
The Tina devices adapt the dynamic safety circuit in Vital and Pluto to safety sensors with mechanical contacts, such as emergency stops, switches and light grids/curtains with dual outputs. Note that ABB Jokab Safety’s dynamic safety sensors, such as Eden and Spot can be connected directly to the Vital/Pluto circuit without intermediate Tina devices.
We have safety relays for all kinds of safety devices with a wide range of input options. Our safety relays have the highest safety level (PL e according to EN ISO 13849-1). The relays are small and compact and have detachable connector blocks for ease of replacement and testing.
Universal relays (RT-series)
The RT-series consists of universal relays that have the most common functions used in safety situations. A universal relay is a safety relay with various input options for various safety devices and risk levels. A machine supplier can therefore, with one single safety relay, select the input configuration that best suits their customers’ safety requirements.These relays can supervise both your safety devices and the internal safety of your machinery
In this series you can find relays for two hand devices, dual input channel synchronization (0.5 s – 1,5 s) and also small, single channel relay for 12 VDC.
The relays in this series are used for time reset, time bypassing and inching.
Expansion relays are used for expanding the outputs of safety relays. Stop signals can be delayed, outputs are also provided for function indication.
How does a light beam/light curtain work?
Both light grids and light curtains utilise optical transmitter and receiver units. From the transmitters beams of infrared light are sent to the receiver. When a light beam is interrupted a dual stop signal is given to the dangerous machines inside the light beam/curtain protected area.
What is the difference between a light curtain and a light beam?
A light curtain has several beams that are placed closely together whereas a light grid consists of only one, two, three or four light beams. The beams are closest on a light curtain that is used for finger detection. Then the resolution is 14 mm. Light curtain beams are at their widest spacing when used for thigh detection (90mm resolution). For light grids the beams are normally placed at a relative distance of 300 to 500 mm. The choice between light grid or light curtain is often a question of available safety distance, reach and price. Light curtains are often chosen for short safety distances. Light grids are chosen for long distances, up to 50 m, and for a low price.
The safety distance (how far away from the risk area a safety component must be placed) is based upon the machines stopping time. The basic idea is that a safety component should be placed so far from the risk area that it is not possible to enter the area before the machine has stopped.
For safety contact strips it is extra important that the stopping distance is monitored. An incorrect stopping distance could in many cases result in very high risks. The stopping distance is also needed during area limiting e.g. for robots when dividing the working area into sectors.
Regulations and standards
It is also important to measure the stopping time, to meet the requirements set by the machinery standards, directives and regulations.
Wear in a machine is something that can affect braking and motors, which means that the stopping time of a machine can change with time.
Why should you use sensors/switches?
- To supervise doors and hatches around dangerous machines.
- To monitor the position of a machine.
- To manage the safety in harsh environments.
Eden – highest safety level and reliability
Our recommendation is to use the Eden sensor because it is the safest and most reliable solution. The Eden sensor is a non-contact switch and has a dynamic function. Also it is possible to connect up to 30 Eden sensors in series and still achieve PL e according to 13849-1.
Why do you need an Emergency stop?
– So that anyone shall be able to stop a machine during a machine break-down or if someone is in danger.
E-stop buttons shall according to relevant standards be red with a yellow background. An emergency stop grab wire shall be red for high visibility. A sign that indicates the location of the E-stop shall be green with a white picture and possibly with text in the local country’s language.
An E-stop shall stop the machine as quickly as possible. To obtain a quick stop one either removes the power directly or one lets a frequency converter ‘run down’ and afterwards after a little delay, remove the power. An E-stop shall not create other hazards. Therefore a risk analysis must be made for the E-stop to be correctly connected.
Three-position devices, hold-to-run devices and enabling devices are used during trouble shooting, programming and test running when no other safety components are possible or suitable. The device is held in the hand and the operator can in an emergency situation either press harder or entirely release the device to stop the machine..
Two-hand control device
A two-hand control device is used when it must the guaranteed that the operator’s hands will be kept outside the risk area. If there is a risk that someone else other than the operator can reach into the machine without the operator seeing it, the safety device must be supplemented by something more, e.g. a light beam.
Safety Rails / Bumpers / Safety Mats
Contact rails are used as protection against squeezing accidents, i.e. on moving machine parts and automatic doors and hatches. The strips come in customised lengths and various cross sections.
Bumpers are used as safety buffers to protect against remote control transport vehicles and other dangerous moving objects that require long stopping distances.
Safety mats are used for protection around hazardous machinery. They are well suited for monitoring an area used for loading and unloading of material to a machine.
Quick-Guard® fencing system and Safety Roller door
A flexible and stable fencing system which is easy to install
Quick-Guard is a very flexible fencing system consisting of a minimum of different components, e.g. aluminium profiles, patented brackets, net-locks, mesh, solid or noise reduction panels. Using these components there are almost no limitations as to what can be built. Quick-Guard fencing costs little to assemble and modify..
Due to our patented screw-lock system, we can supply all brackets pre-mounted with fixing screws and nuts. No holes need to be drilled in the profiles and all cutting is straight. This makes assembly and modification very easy..
Two versions of Quick-Guard
The Quick-Guard fencing system is available in two versions, Quick-Guard (Standard) and Quick-Guard E which also can be combined.
Safety Roller Door
Safety Roller Doors make it possible to have a short safety distance to the machine. It can be integrated into the Quick-Guard fencing system from ABB Jokab Safety as well as in other types of fencing systems. It can also be installed on the machine or other permanent construction.