404 HEIDENHAIN Technical Manual iTNC 530 HSCI
Important notes on
the radio network
of the wireless
handwheel system
The HEIDENHAIN wireless handwheel system uses the ISM band in the
frequency range of 2.405 GHz to 2.480 GHz up to a maximum transmission
power of 10 mW. As the ISM band generally is a freely accessible frequency
range worldwide (country-specific restrictions must be checked individually
for the country of destination), many radio systems have been developed for
this range. As other radio systems can disturb the radio transmission of the
wireless handwheel system, a vacant radio channel (ZigBee channels 11 to 26)
is always required to ensure noise-free radio communication between the HR
550FS and HRA 551FS.
Since 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 free radio channel available, we advise against
using the wireless handwheel system.
HEIDENHAIN cannot guarantee noise-free radio communication of the
HR 550FS wireless handwheel system with 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 later on. 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. HEIDENHAIN therefore offers the HR 520 handwheel with cable
as an alternative.
If a wireless handwheel is to be operated in an unsafe radio environment
anyway, the HR 550FS mobile part must be placed into the charging position
of the HRA 551FS if a critical situation occurs, in which a workpiece could be
damaged through an emergency stop. The contacts on the HR 550FS and the
HRA 551FS provide a direct contact between the mobile part and the base
station, and therefore communication is independent of the radio connection.
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