2.1
Introduction
CNC machine tools which are using Renishaw
spindle probes with radio signal transmission
for workpiece inspection, or tool setters with
radio signal transmission, require a Renishaw
radio machine interface (such as the RMI-Q)
for signal transmission. The RMI-Q, which acts
as a combined radio transceiver and machine
interface, converts signals from the radio probe
into voltage-free solid state relay (SSR) and driven
outputs for transmission to the CNC machine
controller.
The RMI-Q is designed to be mounted within the
machine’s working envelope.
Application of the RMI-Q enables individual
radio turn on and subsequent operation of up to
four separate second-generation radio probes,
permitting numerous combinations of radio
inspection probes and/or radio tool setters to be
used on the same machine tool.
RTS tool setters, and other second-generation
radio probes, are easily identified by a ‘Q’ marking.
First-generation radio probes, which do not
have the ‘Q’ marking, may also be used with the
RMI-Q. However, in machine tool applications
where more than one radio probe is required, it is
recommended that only second-generation radio
probes are used. If a first-generation radio probe
is used with the RMI-Q, any additional probes
must be ‘Q’-marked second-generation radio
probes.
Optimum communication performance between
the RMI-Q and the radio probe is achieved when
the RMI-Q is aligned towards the radio probe,
both positioned within the machine working
environment. Other alignments within the
machine working environment are permissible
with negligible reduction in communication
performance.
RMI-Q basics
Mounting of the RMI-Q outside of the machine
working envelope is possible but should be
avoided, as communication performance may
be reduced. For details about signal status, see
“SIGNAL LED” on page 2.3.
CAUTION:
RMI-Q operation of up to four
separate radio probes is different to
“multiple
probe mode
”, which is a function of the radio
probe that enables individual application of
multiple probes but does not use radio turn on.
NOTE:
When an RMI-Q is mounted outside of the
machine working envelope, the communication
to the radio probe will be via reflective surfaces
such as floor, ceiling and walls. It is highly likely
that the radio communication link will be subjected
to external radio signals from other devices
and will result in a less robust communication
performance. A reflective path must not exceed
15 m (49.2 ft).
Power supply
The RMI-Q can draw its supply from the CNC
machine tool’s 12 Vdc to 30 Vdc supply and
present a peak load of up to 800 mA during turn
on (typically < 500 mA from 12 V to 30 V).
Input voltage ripple
The input voltage ripple must not cause the
voltage to fall below 12 V or rise above 30 V.