f the operator decides, after the
start signal has been given to the machine, to
make an after grasp i.e. try to adjust the part
that has been placed into the machine, then a
dual stop signal is given to the machine.
A one-hand control device can be used when
the operator cannot reach the hazardous area
with his/her free hand or on less dangerous
machines.
JSTD25A Mounting Station
Regulations and Standards
The JSTD1 Safeball is certified by DNV.
Approval numbers are 01-MAL-CM-0101
(two-hand device) and 01-NAL-CM-0100
(one-hand device).
JSTD1 SAFEBALL A New Category 4 Control Device
Approvals
Unique Worldwide Two-Hand Device
Safeball is a completely new approach to the
design of one and two-hand safety devices. Instead
of the conventional approach using ordinary push-
buttons and non-ergonomic protection for unintentional
activation, a hands on approach has been developed.
Safeball consists of a spherical ball containing two
embedded push-button switches, one on each side
of the ball. By using this push-button configuration,
the risk of unintentional activation is minimized and
the device is simple and ergonomic to use.
Safeball can be utilized for either one-hand (one
Safeball ) or two-hand (two Safeballs ) applications.
In either application, and in order to meet the required
level of safety, the Safeball(s) switches are monitored
by specified/certified JOKAB SAFETY Safety relays.
In the case where Two hand control is used, both
Safeballs i.e. all four push-buttons have to be acti-
vated within 0.5 seconds. If one or more push-but-
tons are released a Stop signal is given to the
machine. In order to provide the highest level of safety
the Safeball design provides the operator with a dual
switching function and short circuit supervision in
each hand.
Each Safeball is ergonomically designed and has
both its cover and actuator made of environmental
friendly polypropylene. The design allows for comfort
of use for all hand sizes and operation from numerous
gripping positions. Mounting
of the Safeball is also
very flexible allowing
the device to be
mounted in the
most ergonomic
position for the
operator.
www.jokabsafetyna.com
1-888-282-2123
136
IN PROGRESS 1-888-282-2123
www.jokabsafetyna.com
Technical Data - JSTD1 SAFEBALL Manufacturer.......................... JOKAB SAFETY AB, Sweden
Ordering Data........................................ JSTD1-A, -B, -C, -E
Color............................................................ black and yellow
Weight.................................................. 0.2 kg with 2 m cable
0.7 kg with 10 m cable
0.1 kg with 4x0.25 m wires
Size
Height................................................... approximately 71 mm
Diameter......................... minimum 68 mm, maximum 72 mm
Base..............................................................................42 mm
Temperature................................... 0ºC to +55ºC (operating)
-20ºC to +70ºC (storing)
Protection Class............................................................. IP67
(not intended for use below water surface)
Operating Force..................................................approx. 2 N
Actuator Travel.............................................. 1.3 +/- 0.5 mm
Max. Switching Load...................30 V/2A DC, resistive load
Recommended Load..............24 V/10mA DC, resistive load
Min. Switching Load................ 6 V/10mA DC, resistive load
Contact Material................................... gold clad silver alloy
Contact Resistance............................................. 100 mOhm
Mechanical Life....................>1x10
6
operations at max 1 Hz
Electrical Life............................... dependent upon electrical
load characteristics
Connection Cable
JSTD1-A.................................... 2m PVC-cable, 4 x 0.75mm
2
JSTD1-B, JSTD1-E.......... 4 x 0.75mm
2
wires, approx. 0.25m
JSTD1-C.................................. 10m PVC-cable, 4 x 0.75mm
2
Chemical
Resistance at 20ºC
Chemical
Resistance
Alcohols
Good
Paraffin Oil
Good
Milk
Good
Silicon Oil
Good
Acetone
Good
Two-Hand Control Device
The Two hand control device
is made by using two Safeballs ,
each having two internal push-
buttons. The Safeballs must be
mounted a minimum distance
between each other (see Mounting
description).
By utilizing two push-buttons in
each device a double safety func-
tion is provided in each hand.
The highest safety level is achieved
by connecting all four push-but-
tons to the JOKAB SAFETY JSBR4
safety relay. The safety relay gives
a dual and supervised safety func-
tion and requires input activation
within 0.5 seconds in order to start
the machine. It also checks that all
four push-buttons have returned to
their deactivated positions before a
new start is allowed. The JSBR4
safety relay also provides a stop
signal if one or more push-buttons
are released.
One-Hand Control Device
Safeball is also a very practical
method of providing a one hand
control device as it is very easy to
find and activate by the machine
operator. One hand devices should
only be used when the operator
cannot reach into the hazardous
area with his/her free hand or on
less dangerous machines. Before
installation necessary risk assess-
ment must be made to determine
suitability of this type of control.
To achieve the highest safety level
for One hand control the Safeball
must be connected to the JOKAB
SAFETY RT6 safety relay.
Versions
Safeball is available in several
versions to meet different environ-
mental conditions and mounting
methods.
JSTD1-A The standard version
with actuators made of plastic and
2 m cable.
JSTD1-B Made as standard version
but without cable. Instead it has four
wires each 0.25m long.
JSTD1-C Same as JSTD1-A but
with 10 m cable.
JSTD1-E Same as JSTD1-B but
with 2 NO contacts.
Function - JSTD1 SAFEBALL Activation of
a push-button.
A top cover
is not needed
as activation
switches are
fitted on each
side of the
Safeball.
137 www.jokabsafetyna.com
1-888-282-2123
138
The Safeballs 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 Safeball can be mounted in a fixed position
or on a tilt and rotational support.
This flexibility of mounting permits
the Safeball to be fitted in the best
ergonomic position for the ease of
operation by the operator. The dis-
tance requirement between two Safe-
balls or between a Safeball and
a wall or edge of a table depends
on how the Safeball is mounted.
Safeball can be mounted with four
M5 screws or ST4.8 self-tapping
screws. If required the connection
cable can be taken out at the side
of the lower part of the Safeball ,
there are two prepared outlets pro-
vided for this purpose.
Note: When Safeball 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.
Mounting Distance
Table mounting two Safeballs .
In order to prevent cheating the
distances shown are the minimum
allowed.
Safety Distance
The Safety distance is the dis-
tance between the Safeballs and
the dangerous machine movement.
The safety distance requirement
can be calculated using the follow-
ing formula for Safeball according
to approving authority and EN 999:
S= KxT+C where
S = safety distance in mm
K = hand speed, 1600 mm/s
T = total stopping time for the
dangerous movement (includ-
ing the response time of the
safety relays in seconds)
C = Constant= 0 mm for Safeball
Mounting Methods
To be an approved two-hand
device, both Safeballs must be
mounted a minimum distance apart
in order to prevent operation of
both balls with one hand. Safeballs must be fitted a minimum distance
from edges of tables or a wall.
It is essential that Safeballs 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 - JSTD1 SAFEBALL Mounting on a table.
Example of alternative mounting.
180
120
120
mm
Safety distance is the distance between the
Safeballs and the dangerous machine movement.
Note: S must never
be less than 100 mm.
Mounting with ball joint, which
can be rotated and angled. 1-888-282-2123
www.jokabsafetyna.com
139
JSTS31
Floor mount with distance ring
(JSTS30 without distance ring).
JSM C5
Angled ball and socket for
mounting on table.
Accessories - JSTD1 SAFEBALL Two-Hand Control Device
The Safeballs are designed to be connected to
a JOKAB SAFETY JSBR4 safety relay or safety PLC
to achieve the requirements for a two-hand device.
By connecting the Safeballs in this electrical configu-
ration Type IIIc, the highest safety level according to
European standard EN 574 is achieved.
One-Hand Control Device
When used as a one-hand device the Safeball is
designed to be connected to a JOKAB SAFETY RT6,
RT7 or RT9 safety relay in order to achieve the high-
est possible safety level for this type of control.
Electrical Connections - JSTD1 SAFEBALL JSTD25-A
JSTD25-B
JSTD25-D
JSTD25-E
JSTD25-C
Enclosure Only
Example of two Safeballs connected to JOKAB SAFETY
relay JSBR4. The reaction time at stop is < 15 ms.
Example of a single Safeball connected to JOKAB
SAFETY relay RT6. The reaction time at stop is < 20 ms.
Height
850-1100 mm