installation process. The handheld terminal’s are not designed to be connected
or disconnected whilst the machine is operating.
On many simple machines the handheld terminal is also the only operating
option, so that, without the handheld terminal, the machine cannot be put into
operation at all. Nonetheless, if the connector is unplugged from the machine
during operation the emergency stop circuit is broken and the emergency stop
function of the machine is activated, causing the machine to stop.
If a handheld terminal is uninstalled from a machine and is not reinstalled im-
mediately, the equipment must be locked out in order to avoid confusion with
a functioning handheld terminal. The machine can only be put back into oper-
ation again after a new handheld terminal has been installed.
This procedure must be described in the operating instructions for the machine
and is the responsibility of the operator.
Due to the fact that plugging and unplugging takes place only rarely and that
the machine is out of operation when unplugged, the risk of an accident as the
result of a non-operational emergency stop button is considered to be very low
and the use of red/yellow identification is therefore permissible.
The red/yellow emergency stop button must be connected into the emergency
stop circuit of the machine in any case and must cause the power supply to
the machine or set of machines in a plant to be switched off (stop category 0
or 1 in accordance with EN 60204-1).
Radio controlled handheld terminals: Stop button
Wireless handheld terminal’s present a different case. These devices are not
normally assigned to a specific machine but can be frequently logged on and
off whilst the machine is in operation and can also be switched between dif-
ferent machines. For this reason the stop button is not always operational and
the operating status is not clear to everyone.
Therefore, for stop functions in wireless controllers, EN 60204-1:2006 "Safety
of Machinery. Electrical Equipment of Machines" (Chapter 9.2.7.3), demands:
"The operating means to initiate this stop function shall not be marked
or labelled as an emergency stop device, even though the stop function
initiated on the machine can be an emergency stop function."
For this reason, for radio controlled handheld terminal’s KEBA uses a stop
button that features all the mechanical characteristics of a normal emergency
stop button but is of a neutral grey colour.
In contrast to the red/yellow emergency stop button there is no need to switch
the stop output signals of the radio receiver into the machine’s normal emer-
gency stop circuit. It can also be used to stop individual safety zones of a
machine or plant, where functions such as “Safe operational stop” can be trig-
gered. This means that the drive components are safely maintained in con-
trolled shutdown by means of active, powered drives (stop category 2 in
accordance with EN 60204-1). This can prevent the loss of reference data and
facilitates fast restart of the machines.
Appendix: Machinery Safety
KeTop T10
© KEBA 2014
Project engineering manual V1.02
68
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