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...for the machine operator to be able to directly start and stop dangerous machine movement!
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Three-Position Enabling Devices
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, in an emergency situation, can either press harder or entirely release the device to stop the machine.
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From Directive
98/37/EC, 1.2.5
“If, for certain operations, the machinery must be able to operate with its protection devices neutralized, the mode selector must simultaneously:
...permit movements only by controls requiring sustained action...”
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JSHD4 Ergonomic
Three-Position Devices
with double three-position
button, gives a stop signal
when released or fully
pressed in.
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Two-Hand Control Devices
A two-hand control device is used when it must guarantee 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.
To be able to operate the machine with the two-hand device, all the buttons on the device have to be operated within 0.5 seconds of each other.
This is called concurrence. All the buttons also have to be returned to their initial position before one can start again. If any button is released during the machine movement, the machine will be stopped. Using the stopping time, one can calculate the necessary safety distance. A safety distance of less than 100 mm must not be used.
The two-hand device protects against “aftergrasp”— if the operator by reflex tries to enter or reach into a machine during the dangerous machine movement.
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From Directive
98/37/EC, 1.3.8
“Guards or protection devices designed to protect exposed persons against the risks associated with moving parts contributing to the work (such as cutting tools, moving parts of presses, cylinders, partsin the process of being machined, etc.) must be
...otherwise, movable guards complying with requirements 1.4.1 and 1.4.2.2.B or protection devices such as sensing devices (e.g. nonmaterial barriers, sensor mats), remote-hold protection devices (e.g. two-hand controls), or protection devices intended automatically to prevent all or part of the operator’s device from encroaching on the danger zone in accordance with requirements 1.4.1 and 1.4.3.”
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JSTD1 Ergonomic Safeball is a two-hand control device with four built-in buttons.
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Foot Operated Switches
A foot operated switch is used when the operator has to hold the material during processing. The pedal must have a safety cover to prevent unintentional start.  For seated work, one must also have a foot support to facilitate the operator holding his foot in the pedal’s off position. The highest safety level is secured by monitoring the pedal with a safety relay. |
 From EN 693 Machine Tools Safety - Hydraulic Presses
“5.4.6.1:
...push button, foot switch and start control devices shall be adequately shrouded to prevent accidental operation. Foot switches shall permit access from one direction only and by one foot only.”
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Why Should I Use?
Why should I use Control Devices?