July 2013 3.41 Handwheel input 397
General
information
Thanks to the wireless connection between the handwheel and the control,
the HR 550FS wireless handwheel system and the HRA 551FS handwheel
adapter provide maximum ease of use to the machine operator. The wireless
communication uses the public, and therefore freely available, 2.4 GHz radio
band via a special radio transmission protocol from HEIDENHAIN.
The wireless handwheel system attains a high and certified safety standard
because of its dual-channel transmission protocol. The safety functions of the
HR 550FS fulfill the requirements of performance level d, category 3,
according to EN ISO 13849-1. Single errors do not lead to the loss of the safety
functions. The service department must be notified if an error occurs. Only the
functions of the permissive buttons and the emergency stop switch are
classified as safety functions of the HR 550FS.
The safety functions must not be bypassed or deactivated in some other way.
Modifying or rebuilding the HRA 551FS and HR 550FS is not permitted and
may lead to a loss of the safety functions.
The machine operator is responsible for identifying the area in which the
wireless handwheel may be used. The wireless handwheel itself does not
provide any configuration possibilities or limit values for defining a certain
maximum range of use.
Because a handwheel is always connected with the movement of axes, the
operator must be able to trigger an emergency stop of the machine by means
of the handwheel at any time. This results in a special situation for the
emergency stop switch of the HR 550FS wireless handwheel system. An
unsafe situation in the radio communication must always trigger a safe
reaction from the control. Therefore, an interference in the radio
communication also means an emergency stop at the HRA 551FS as reaction.
An unexpected emergency stop of the machine is undesirable and may cause
damage to the contour of the workpiece being machined. It is therefore
essential to ensure a noise-free radio communication. Reliable operation of the
wireless handwheel always requires planning the coexistence of the radio
users active in the frequency and radio range concerned. If this cannot be
guaranteed because there is no vacant radio channel available, we strongly
advise against using the wireless handwheel system. HEIDENHAIN cannot
guarantee noise-free radio communication of the HR 550FS wireless
handwheel system and the HRA 551FS.
Even if an available radio channel has been found and the proper functioning
of the system has been ascertained, it is possible that the availability situation
of the 2.4 GHz ISM band will change over a longer period of time. If this
situation cannot be corrected by changing the wireless handwheel system or
the competing radio system to another channel, it may become necessary to
revert to using a handwheel with cable.
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