Jokab Safety JSHD4 Data Sheet
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10:4
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Three position device
JSHD4
Approvals:
Use:
Troubleshooting
Test running
Programming
Advantages:
Ergonomic
LED information
Adaptable
Cheat Safe
Adapted for AS-i
The safest solution during trouble shooting, programming and testing
Why three-positions?
An operator who is under pressure must be able to give a
stop signal, whether in panic he/she pushes harder on the
button or just lets go of it.
Three-position devices, hold-in and acceptance devices
can be used for trouble shooting, programming and test
running in situations where no other protection is available
or feasible.
If the operator has to enter a risk area to trouble shoot or run
a test, it is extremely important that he/she is able to stop the
machinery without having to rely on someone else to stand
by a stop button that is further away. In addition, no-one else
should be able to start the machinery from the outside after
it has been stopped by use of the three-position device.
Hold to run device or Acceptance device, what is the
difference?
Hold to run device: The start signal is given when the but-
ton is pressed. The stop signal is given when the button is
released or pushed fully in.
Acceptance device: The start signal for separate starting
is given when the button is pressed. The stop signal is given
when the button is released or pushed fully in. “Separate
start” means, for example, that a program start signal is sent
to the robot via a separate button in the acceptance device.
The three-position device is designed to be ergonomic
The device is ergonomic, both in respect of its shape, fitting to the hand, and the way the buttons are operated. It
is easy to operate the three-position device using just the
fingers, and the middle position provides a secure resting
position. The device has LED indications that show the operational status, i.e. stop or ready signal. The two additional
buttons can be used, for example, for start/stop, up/down
or forward/back. Internally the device is duplicated. The
three-position function itself is built up of two completely
independent three-position buttons which are felt by the
user to be one button.
Cheat Safe three-position device with hand recognition
The three-position device JSHD4 has sensors which ensure
that it is a human hand holding it. By using this, the safety
level is increased, and the risk of manipulation or bypass of
the safety function is reduced. It is no longer possible to
expose the operator or odder to danger by trying to lock the
three-position device in run mode.
Three-position device adapted for AS-i
The three-position device JSHD4 also comes in a version
adapted for direct attachment to the AS-i bus
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Highest safety level
whether the button is pushed or released
When the three-position button is released you will obtain a dual
stop. It is essential that the machine stops when you put aside the
three-position device, for example during adjustment.
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When the three position button is pushed all the way in you will
obtain a dual stop. It is essential that the machine stops in an
emergency situation.
How does a a three-position device work?
Safety level
A safe Enabling or Hold to Run device should function as
follows:
1. The Stop signal in released (top) and bottom position
shall have the same safety level.
2. Provide a ‘Start’ or ‘Ready’ signal in a distinct middle
position.
3. After a ‘Stop’ in the bottom position, a ‘Start’ signal or
‘Ready’ signal is not permitted until the three position
push-buttons have been totally released and again
pressed to the middle position.
This function is achieved mechanically within the three
position push-buttons in the device.
4. A Short or Open circuit in the connection cables
shall not lead to a dangerous function e.g. ‘Start’ or
‘Ready’ signal.
In order to meet the above conditions, the three-position
switch must be connected to a suitable safety relay with a
two channel function, e.g. RT6, RT9 or JSBT4, which can
monitor that both three-position buttons are working and
Released position
Middle position Bottom position
that there is no short or open circuit in the connection
cable or the switch.
Regulations and standards
The JSHD4 is designed and approved in accordance with
appropriate directives and standards. See technical data.
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Three-position devices in different versions
Three-position device fitted to a
machine control unit.
Panel assembly of JSHD4H2 on a
programming unit for robots.
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Design a three-position device for your needs
1. Choose between five different top units
JSHD4-1
2TLJ020006R2100
JSHD4-2
2TLJ020006R2200
• LEDs
• Front button
• Top button
JSHD4-3
2TLJ020006R2300
• LEDs
2. Choose a bottom part suitable for your assembly
AC, AD AF, AGAA, AH, AJ AB AE
AA – 2TLJ020005R1000 with cable gland
AB – 2TLJ020005R1100 with Cannon connection
AC – 2TLJ020005R1200 with M12 connection (5 poles)
AD – 2TLJ020005R1300 with M12 connection (8 poles)
AE – 2TLJ020005R1400 with M12 connection (8 poles) and
emergency stop
AF – 2TLJ020005R1500 with M12 connection (4 poles) and
2 AS-i nodes (for front and top button)
AG – 2TLJ020005R1600 with M12 connection (4 poles) and
1 AS-i node (without front and top button)
AH – 2TLJ020005R1700 with cable gland and PCB with
10 screw connections
AJ – 2TLJ020005R1800 with cable gland and PCB with
16 screw connections
JSHD4-4
2TLJ020006R2400
• LEDs
• Front button
JSHD4-5
2TLJ020006R2500
• LEDs
• Top button
3. Choose hand recognition for making your three position device cheat protected (option)
Anti-tamper PCB – 2TLJ020005R0900
4. Check the table if your combination is available
5. Choose a bottom plate (option)
JSM50H, bottom plate for
non-contact sensor Eden (Eva) –
2TLJ020205R6400
JSM50G, bottom plate for
Safety Interlock switch JSNY5 –
2TLJ020205R6300
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