Safe, By Demag

Demag SafeControl

Safety during crane operation

Safety during crane operation

The combination of crane control and wireless control concept creates the link between an operator and a crane and thus makes optimum load handling a tangible experience. Absolutely safe operation of a crane or a system of several cranes must always be guaranteed – safety for the crane operator as well as for the transported goods and surrounding infrastructure.
The smart Demag SafeControl system enables independent and continuous monitoring of a crane on the basis of a largely redundant control concept to bring the system to a standstill independently if any irregularities occur. Furthermore, dangerous conditions can be identified and prevented in advance. The crane operator can concentrate fully on his/her work at all times thanks to the safety control system. Radio control of the crane or cranes is intuitive, efficient and user-friendly. The combination of safety control system and radio control enables the crane operator to transport and position loads precisely. This meets our high demands for safe and reliable crane control.

SafeControl_Word_Cloud

The SafeControl system can reveal it full potential wherever a crane needs to meet complex operating and control requirements. It provides the technical basis for implementing tandem crane control, smart-tandem crane control, the turning of loads and load-sway reduction as well as for other complex requirements, such as a crane by-pass control. Demag SafeControl enables safety-related control functions up to Performance Level d in accordance with EN ISO 13849 or SIL 2 in accordance with EN 61508.

Benefits of Demag SafeControl
  • Crane operation additionally protected by continuous, independent monitoring of basic crane functions
  • High productivity thanks to optimised load handling
  • User-friendly control for complex applications
  • Technical basis for a safety-related control system for almost all load handling needs
  • Safety-related control functions up to Performance Level d according to EN ISO 13849, or SIL 2 according to EN 61508
  • Two-channel hardware enables Category 3 (CAT 3) according to EN 13849-1
  • TÜV certified

Safe, good to know

Technical background

SafeControl provides the basis for a large variety of safety-related applications and is suitable for a wide range of crane and lifting equipment applications. This applies to requirements for the pure lifting and lowering of loads, in addition to complex and safety-sensitive tasks, such as tandem control or turning of loads.

SafeControl is a modular control system consisting of decentrally arranged control modules as well as various additional hardware modules (I/O extension module, radio receiver, large load display and others). Communication between these control modules is wireless or wired via a CAN bus.

The firmware covers a wide range of control functions, including various assistance features. The control functions can be activated via a parameter-programming interface. The modular SafeControl control system enables safety-related control functions up to Performance Level d according to EN ISO 13849 or SIL 2 according to EN 61508. The control system hardware operates completely on two channels so that control functions can be executed in category 3. This is certified by TÜV.

Performance level – safety can be defined

The performance level is defined in the EN 13849 standard as a “discrete level used to specify the ability of safety-related parts of control systems to perform a safety function under foreseeable conditions.”

The performance level can thus provide a basis for assessing the reliability of a safety function. The performance level is divided into five levels, from level a (low performance level) to level e (highest performance level).

The higher the performance level, the safer and more reliable the given function. Before a component is used, it must be checked to ensure it can be used for the intended application and the assessed risk. The rule is that the performance level of the component must always be at least as high as the risk value at the relevant point.
A risk assessment is carried out according to the EN 13849 standard and assesses the possible extent of damage, the frequency and duration of stay and the possibility of avoiding the hazard.

safecontrol_flussdiagramm_EN
Example of a decision diagram to determine the performance level according to the risk assessment for a tandem control system.

Perfect interaction between all components

Tandem operation enables lifting and transport operations which can sometimes not be performed safely with individual cranes or hoists: lifting long and bulky loads and lifting loads whose weight exceeds the maximum load capacity of the individual crane. Perfect interaction between the long and cross-travel motions, safety control system and radio control makes it easier for the crane operator to concentrate fully on handling the load.

Smart tandem control of two cranes or hoists is one of the most complex operating methods for crane systems. Perfect interaction between all components is of crucial importance. Moving two cranes and up to four trolleys simultaneously requires a safe and powerful control concept.

The Demag control concept for cranes with smart tandem enables smooth and precise load handling – particularly for complex crane applications. By setting different hook heights on both trolleys, a bulky load can be turned simultaneously, safely, quickly and conveniently and can be transported to the desired position.
Demag DRC radio control systems make it easier for the operator to handle loads thanks to intuitive and ergonomic features. The control elements are arranged in such a way that the crane operator can always keep an eye on the load handling process. Assistance systems can be switched on and off with ease using selector switches or control elements. The SafeControl assistance systems are also easier to monitor via the LC display integrated in the control unit.

The Demag control concept enables the crane operator to quickly and easily select between single and smart tandem operating modes. Switching between these operating modes is done in such a way that potentially hazardous conditions for individuals and the surrounding infrastructure can be identified and avoided.

Tandembetrieb
Benefits of (smart) tandem operation
  • Safe and reliable handling of heavy and bulky loads
  • Safe and reliable switch-over between operating modes
  • Efficient load handling
  • Precise position control thanks to Demag tandem crane control concept
  • User-friendly radio controls

Operating modes

Tandem mode

Control of two cranes with a common control system

Tandem mode allows two cranes to be used independently of each other as individual units. It is also possible to use individual hoists, which gives the crane operator the flexibility that is needed at all times during daily work. Changing between operating modes is quick and easy with the selector switch on the radio control.

To change from single operating mode to tandem mode, one of the two crane control systems must be logged off and is then inactive. The remaining control system can control both cranes with all trolleys. In tandem mode, both cranes can be controlled together or independently with one radio control system. In single operating mode only one crane can be controlled (crane selector switch: A or B), in tandem mode both cranes can be controlled in parallel (crane selector switch: A+B)

Tandembetrieb

Single operating mode

Each crane or hoist can be controlled by its own control system

In single operating mode, each crane or hoist can be controlled by its own radio control system as long as there are no safety-relevant special functions which can result in mutual interference by the cranes.

Smart tandem mode

Two cranes with up to four trolleys

In smart tandem mode, two cranes with up to four trolleys can be used to transport particularly bulky and heavy loads.

Safely exceeding limits

The process of turning loads requires perfect interaction between the long and cross-travel motions as well as the lifting motion. This safety-sensitive operation enables the crane operator to turn a load weighing up to 50 tonnes by up to 180°. When a load is turned on the crane, all components must interact smoothly and the process must be constantly monitored.

Wenden von Lasten
The load turning process allows a load weighing up to 50 tons to be turned by up to 180°.

When a load is turned, the maximum load on each rope hoist, the collective load on both rope hoists and the relevant rope angles must be taken into account. During the turning process, therefore, both the inclined pull and the lifting or lowering motion of one or both hoists need to be corrected.

The smart SafeControl system allows for the shift in load between the two hoists as well as the inclined angle of pull for correction purposes. With the Demag DMR modular rope hoist, it is possible to achieve a rope angle of up to 15° – or more in some cases. In addition, uncontrolled slipping of one of the two trolleys must be avoided. For safe control and monitoring of the load turning process, SafeControl uses its ability to monitor several motions simultaneously as a coordinated movement. For example, rope angle sensors are included in the monitoring of the turning process. Inclined pull of the hoists can thus be avoided with the load turning function.

Demag SafeControl independently safeguards the load-turning process at all times. The control system provides safety-oriented monitoring of all motion sequences and stops operation or gives a warning if any irregularities occur, thus avoiding dangerous operating situations. If the defined maximum rope angle stored in the control system is reached or exceeded, only those functions that lead to a reduction of the rope angle are possible. Errors by the crane operator when turning the load can be avoided with SafeControl.

Benefits when turning loads
  • Loads weighing up to 50 t can be turned
  • Loads can be turned by up to 180 degrees
  • Safe and reliable monitoring of the turning process by rope angle sensors
  • Safe and reliable cut-off of lifting and travel motions if the maximum permissible rope angles are exceeded
  • Requirements for safe control systems according to standard EN 13849-1 are fulfilled
  • Crane operating errors can be avoided
  • Increased productivity when turning loads

Two variants for turning loads

Variant 1: Warning signal when the permissible rope angle is exceeded

The control system triggers an acoustic and/or visual warning while the rope angle is measured as soon as the maximum deflection angle is reached.

Variant 2: Monitoring by safety control system

The safe load turning function can be achieved by combining the Demag smart SafeControl system with a two-channel, non-contact sensor system for precise measurement of the rope angles. The control system monitors all motion sequences and automatically stops the lifting and travel motions if any irregularities occur. If the previously defined maximum inclined angle of pull saved in the control system is reached or exceeded, only those functions that lead to a reduction of this angle are possible.

By monitoring with Demag SafeControl, a high safety category of Performance Level d (for lifting and lowering the load) or Performance Level c (during travel) in accordance with EN 13849-1 (category 3) can be achieved. Category 3 means that if a single error occurs when a signal is transmitted or evaluated, it is reliably identified by the control system and can never lead to a critical or unsafe situation.

In this way, the crane operator is ideally protected and can concentrate fully on the task. Safety and productivity can be increased when turning loads using the Demag smart SafeControl system.

Assistance system independently reduces sway

Demag load-sway reduction supports crane operators when handling loads. Loads can start to sway at any time when the crane or trolley is moving. On the basis of the Demag smart SafeControl system, load sway motions can be detected by measurement of the rope angle and compensated by dedicated correction of the travel motions This means that even sensitive loads can be positioned more quickly and, above all, more safely.

The integrated sensor system precisely measures deflection of the load and can prevent an already lifted load from swaying by identifying the movement in good time. Above all, unexpected malfunctions or irregularities can be avoided and load handling made safer by combining SafeControl and rope angle measurement. Load-sway reduction supports inexperienced crane operators in particular, thus reducing the risk of collisions and increasing crane operating safety.

Sway Control
Load-sway reduction minimises swinging of the load using the electronic protection provided by SafeControl.
Benefits of load-sway reduction
  • Support for load handling through independent corrective action by the crane
  • Faster and more precise positioning of the load
  • Collisions with other machines and equipment can be avoided
  • Improved safety – especially for less experienced crane operators
  • Assistance function, the advantages of which are immediately felt by every operator without the need for additional explanation

Range-specific adjustments of long and/or cross travel

The use of a crane cannot always be planned from the outset and the use case can change after it is installed. Over time, requirements on production lines change and with them the functional range of a crane. The smart SafeControl system makes it possible to bypass sections where the crane or trolley should not travel. What is known as bypass control can block this area for the crane or trolley, avoid the risk of collisions and protect against damage.

Load reduction on the crane can be useful for certain parts of the building. If the building structure is already exposed to heavy loads, the cranes in certain areas can be electronically protected so that they cannot travel at full load, but only with a predetermined partial load.

If there are several cranes on one crane runway or several trolleys on one crane, a crane or trolley anti-collision system can protect against collisions and damage. Sensors constantly measure position and distance. The acquired data is monitored by the SafeControl system at all times and if there is any deviation from the pre-set parameters, the safety control system can immediately and autonomously ensure that the installation is in a safe condition.

Umfahrsteuerung
Certain areas can be electronically identified and bypassed, or the load can be adjusted by the smart SafeControl system.
Benefits of a crane/trolley anti-collision system
  • Protection against collision and damage
  • Continuous monitoring of the installation(s) by sensors
  • Safety cut-off of the installation by Demag SafeControl
Benefits of load reduction
  • Optimum adaptation of your crane to the requirements of the working environment
  • No conversion measures necessary at your site
  • Protection against damage
  • Continuous monitoring of the installation(s) by sensors
  • Safety cut-off of the installation by Demag SafeControl
Benefits of bypass control
  • Optimum adaptation of your crane to the requirements of the working environment
  • No conversion measures necessary at your site
  • Protection against collision and damage
  • Continuous monitoring of the installation(s) by sensors
  • Safety cut-off of the installation by Demag SafeControl

Information on your crane at a glance

The electronic equipment of a crane improves safety when the crane is in operation. At the same time, sensors and smart interfaces enable data to be collected that reflect the condition of the crane. With the aid of Demag radio control systems, Demag StatusControl and Demag StatusBoard, these data can be displayed to the crane operator and owner.

Demag StatusBoard can visualise how much load is actually transported on the hook of the crane. Current status reports and service data can be read quickly and easily from the StatusBoard by the crane operator and anyone else who can see the board.

StatusBoard
Visualisation of the load weight on StatusBoard.
Benefits of StatusBoard
  • Display of the load weight on individual cranes or total loads
  • Display of operating statuses

Your Contact

Demag contact

Demag Cranes & Components GmbH

Postfach 67
58286 Wetter
Germany

Phone:
+49 (0) 2335 92-0
Fax:
+49 (0) 2335 92-7676