JSTD1 SAFEBALL™ Two Hand Device
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Mounting
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The SafeballsTM can be mounted in many different ways. They can be mounted on a table, a machine, on a support or wherever suitable for ergonomic reasons. The SafeballTM can be mounted in a fixed position or on a tilt and rotational support. This flexibility of mounting permits the SafeballTM to be fitted in the best ergonomic position for the ease of operation by the operator. The distance requirement between two SafeballsTM or between a SafeballTM and a wall or edge of a table depends on how the SafeballTM is mounted. SafeballTM can be mounted with four M5 screws or ST4.8 selftapping screws. If required the connection cable can be taken out at the side of the lower part of the SafeballTM, there are two prepared outlets provided for this purpose.
Note: When SafeballTM are mounted in such a way that the distance between them can be adjusted to less than the specified minimum, the mounting screws must be locked to ensure any changes in the distance between the two balls cannot be made.
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Mounting Methods
To be an approved two-hand device, both SafeballsTM must be mounted a minimum distance apart in order to prevent operation of both balls with one hand. SafeballsTM must be fitted a minimum distance from edges of tables or a wall.
It is essential that SafeballsTM are correctly installed in order to prevent unintended activation of the devices with part of the body in combination for example with a wall.
Mounting with ball joint, which can be rotated and angled.
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Mounting on a table.
Example of alternative mounting.
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Mounting Distance
Table mounting two SafeballsTM. In order to prevent cheating the distances shown are the minimum allowed.
Safety Distance
The Safety distance is the distance between the SafeballsTM and the dangerous machine movement. The safety distance requirement can be calculated using the following formula for SafeballTM according to approving authority and EN 999: S = K x T + C where:
- S = safety distance in mm
- K = hand speed, 1600 mm/s
- T = total stopping time for the dangerous movement (including the response time of the safety relays in seconds)
- C = Constant = 0 mm for Safeball
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Note: S must never be less than 100 mm.
Safety distance is the distance between the SafeballsTM and the dangerous machine movement.
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