7.2. OUTPUT SIGNALS (CNC→PMC)
15i 16i
#7 #6 #5 #4 #3 #2 #1 #0
1st SP F229 F045
ORARA
2nd SP F245 F049
ORARB
7.2.1. Orientation completion signal(ORARA)
(i) When the orientation command is input and the spindle has stopped near the preset fixed position
(for example, within ±1°), it becomes ”1”.
ORAR is set to “1” when the following 3 conditions are satisfied :
• ORCMA = 1
• SSTA(speed zero detection signal) = 1
• The spindle is near the present fixed position.
If the orientation completion signal is not issued within a set period of time after the orientation
command signal is input, it is considered to be abnormal. So it should be detected by the
sequence and an orientation alarm should be issued.
Set the condition for judging that the spindle is near the fixed position in the parameter used to
specify the detection level for orientation completion [FS16i:No.4075].
(ii) Tool change or workpiece loading /unloading operations can be started when this signal is ”1”.
(ii) The spindle orientation completion signal is issued when the spindle is within ±1° of the preset
position and so it does not always indicate that the spindle has stopped completely. Some
machines allow a very short operation time for the ATC arm to grip the tool. In this case, start
the ATC arm operation after a short time (0.1 to 0.5 sec.) so that the arm will grip the tool when
the spindle has stopped completely.
(iv) This signal will become ”0” during a tool change if the spindle is pushed away from the preset
position by external force.
In this case, design a power magnetic sequence so that the tool change operation is interrupted.
However, do not release the orientation command, and if the orientation completion signal is
issued again, perform a tool change.
(v) If the automatic tool change (ATC) structure is such that it may cause serious damage if a
malfunction occurs, install a proximity switch to generate a verification signal when the ATC enters
an area in which the automatic tool change operation can be performed. In addition to this, perform
a double safety check by the power magnetic sequence and carry out a tool change.
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DESCRIPTION DESIGN DATE
EDIT
αi series Spindle Amplifier Module
Magnetic Sensor Method
Orientation Descriptions
B-65282EN/05-01