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(9) Wequirements for machine origin detection
Sensor arrangement
■
For CWW-0, CWW-1, CWW-2, CWW-3, and CWW-10
●
Mount the WCWW and CWW signal sensors on the - (CCW) LIMIT side along the work moving direction.
Example:
Ball screw table
-(CCW)
Work
+(CW)
WCWW signal sensor for CWW-10
Cse photo sensors that turn off
CWW signal sensor
when light enters.
For CWW-4 and CWW-5
●
・ Mount the WCWW signal sensor on the - (CCW) LIMIT side along the ball screw work moving direction.
・ CWW signal sensor
◆ When using a stepping motor
CWW signal sensor
Mount this sensor on the rotary shaft of
Cse a photo sensor that
the motor.
turns on when light enters.
MCTCW
Disc with a slit mounted on the
rotary shaft
※ With CWW-4 or CWW-5, the CWW sensor and PC (phase output) signal of the stepping motor driver
can be used (According to the AWD (conjunction) signal of the CWW and PC signals) to
enable accurate origin detection.
Make arrangement so that the PC signal enters once while
the CWW signal (rotary slit width) is active.
◆ When using a servo motor
Input the encoder Z phase (C φ ), instead of the CWW signal, to the +ZCWW and -ZCWW signals,
and leave the CWW signal input disconnected.
Secure 10μ s or more for the pulse width of the
encoder Z phase (C φ ) output.
For CWW-11 and CWW-12
●
・ These types use the LIMIT signal as the origin signal and therefore require the LIMIT sensor
alone.
Cther requirements
■
・ The sensors used must support interfacing at +24 V.
・ The CWW signal, WCWW signal, and the LIMIT signal used as an origin sensor must be free of
chattering.
(When photo sensors are used, chattering makes no problems.)
・ The sensor signal must be detected for 1 ms or more when the object passes the sensor at the
maximum speed.
・ For the encoder Z phase (C φ ) output, use that from the line driver output circuit, and secure
10μ s or more for the input signal width of +ZCWW and -ZCWW.
・ For the CWW-4 and CWW-5 types, the distance between point a and point b and the distance between
point a and point c should be W pulses or more in terms of the number of pulses.
(Hz)
【 CWW-4】
【 CWW-5】
W=0.002× CSPD
a
a
Minimum value of W is 1.
WCWW
WCWW
c
b
c
b
b
c
b
c
Example) When CSPD= 5KHz
CWW
CWW
W=0.002× 5,000=10pulses
b
c
b
c
c
b
c
b
Practically, give some allowance
ま た は
ま た は
CWW
CWW
to it.
・ If +ZCWW and -ZCWW signals are input, the CWW signal must be disconnected.
If the CWW signal is input, the +ZCWW and -ZCWW signals must be disconnected.
(The CWW and +ZCWW and -ZCWW signals cannot be used concurrently.)