Table of Contents
Advertisement
2
Overview
General description
The JSTD20 two-hand device is intended for use where it is necessary to ensure that the operator's hands will be
kept outside the risk area.
The JSTD20 utilises a welded steel housing where two operating pushbuttons are protected by over hand guards.
Between the pushbuttons there is space for an emergency pushbutton and two extra controls or indication lamps.
The JSTD20 is available with or without an emergency stop pushbutton.
The device can be mounted directly on the machine, on the ABB Jokab Safety fencing system or on the JSTS30 or
JSTS31 floor mount.
Safety regulations
Warning!
Carefully read through this entire manual before using the device.
The devices shall be installed by a trained electrician following the Safety regulations, standards and the Machine
directive.
Failure to comply with instructions, operation that is not in accordance with the use prescribed in these instructions,
improper installation or handling of the device can affect the safety of people and the plant.
For installation and prescribed use of the product, the special notes in the instructions must be carefully observed
and the technical standards relevant to the application must be considered.
In case of failure to comply with the instructions or standards, especially when tampering with and/or modifying the
product, any liability is excluded.
Function description
To be able to operate the machine with the two-hand device, both the buttons on the device have to be operated
within 0.5 seconds of each other. This is called concurrence. Both 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. These demands are supervised by a safety relay or similar.
To achieve the highest safety level with a two-hand device it's necessary to have a safety relay or a safety PLC that
fulfill the standard EN 574 according to type IIIc.
The JSTD20 is equipped with a type of large over hand guards in accordance with EN 574. These prevent
unintended activation by for instance a knee or elbow.
2TLC172259M0201 , rev. A
2013-09-13
Obsolete product!
Please see JSTD25 for replacement.
5
www.abb.com/jokabsafety
Advertisement
Table of Contents
