
10. INTERFACE SIGNALS
B–65162E/03
404
To change the gear safely, it must be checked that the spindle motor speed
is low enough before moving the shifter. If the frequency stop signal is
also applied, the safety can be doubly checked.
Essential reason to confirm the spindle motor speed :
If the shifter moves when the spindle motor is rotating at high speed, the
gear will break.
1
Gear selectable output
frequency range
Frequency–stop detect signal
Frequency detection
signal (gear selectable signal)
Output frequency
0
Spindle motor
speed at gear shift
(Low speed)
0 rpm
Shifter
moves
0
End of
gear shift
1
0
Fig.10.4.11 (b) Frequency Detection Signal
D SARA = 1 occurs when output frequency of the actual spindle motor
module arrives within the range set by the frequency command.
1
Specified
frequency
0
Detection range (2), (3)
SARA
Output
frequency
0
Fig.10.4.12 (a) Frequency Arrival Signal
D The setting range is "1 to 100% of the command frequency. However,
when the speed is less than 10% of the maximum frequency, the
detection range becomes wider than the preset range.
D The standard setting at shipment is "15%. However, the detection
range of this frequency arrival signal at low speed widens as shown in
the diagram below.
10.4.12
Frequency Arrival
Signal (SARA)