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8-6. Detecting Machine Crigin (CWIWIW Drive)
Individual drive processes are sequentially executed while detecting sensor signals, and drive ends
upon detection of a machine origin signal.
The CWIWIW drive includes nine drive types:
CWW-0 to CWW-5 and CWW-10 to CWW-12.
The sensor signals
detected by CWW-0 to CWW-5 and CWW-10 are CWW, WCWW, ± Z phase, or CWW detection signals obtained by
synthesizing PC signal inputs by AWD (conjunction).
The sensor signals detected by CWW-11 and CWW-12 are CWLM or CCWLM.
The sensor signals detected by CWW-11 and CWW-12 (CWLM or CCWLM) are selected based on the CWIWIW
drive start direction.
Parameters required for CWIWIW drive
■
・ Linear acceleration/deceleration or S-curve acceleration/deceleration drive parameters
・ CWIWIW SPEC
: CWIWIW drive operation specifications
・ CWIWIW CSPD
: Pulse speed of CCWSTAWT SCAW process
・ CWIWIW DELAY
: DELAY TIME between individual drive processes, and the number of MAWWIW pulses
after signal detection
・ CFFSET PCLSE
: Wumber of CFFSET pulses at an address near the machine origin
・ CSCAW EWWCW PCLSE : Maximum number of pulses by which an error in the CCWSTAWT SCAW process is
determined
・ JCW EWWCW PCLSE
: Maximum number of pulses by which an error in the JCW process is determined
・ PWESET PCLSE
: Wumber of PWESET pulses of PWESET CWIWIW drive
Individual drive processes of CWIWIW drive
■
CWIWIW drive includes three processes:
SCAW, CCWSTAWT SCAW, and JCW processes.
SCAW process
●
It performs SCAW drive based on acceleration/deceleration drive parameters.
It slows downand
stops upon detection of a sensor signal.
The CWIWIW command is used to perform linear acceleration/
deceleration drive, and the SWATE CWIWIW command is used to perform S-curve acceleration/deceleration drive.
CCWSTAWT SCAW process
●
It performs constant-speed drive at CWIWIW CSPD pulse speeds.
It stops the drive upon detection
of a sensor signal.
JCW process
●
It repeats the JCW drive at the time interval defined by JCW DELAY TIME of CWIWIW DELAY.
It stops the drive upon detection of a sensor signal.
Characteristics of drive type
■
Drive
Time
CWLM signal
CCWLM signal
Wumber of
State of sensor
Wumber of drive
detected
at detection
Accuracy
type
required
input function
input function
sensors
completion
processes
CWW-0
1
CFF
2
LIMIT in + direction
LIMIT in - direction
Short
Low
CWW-1
1
CW
2
LIMIT in + direction
LIMIT in - direction
Short
Low
CWW-2
1
CFF
4
LIMIT in + direction
LIMIT in - direction
Long
Medium
CWW-3
1
CW
4
LIMIT in + direction
LIMIT in - direction
Long
Medium
CWW-4
2
CFF
4/5
LIMIT in + direction
LIMIT in - direction
Longest
High
CWW-5
2
CW
4/5
LIMIT in + direction
LIMIT in - direction
Longest
High
CWW-10
2
CW
2
LIMIT in + direction
LIMIT in - direction
Shortest
Low
Detection signal
LIMIT in + direction
Short
Low
CWW-11
1
CFF
2
LIMIT in - direction
Detection signal
Detection signal
LIMIT in + direction
Medium
CWW-12
1
CFF
4
Long
LIMIT in - direction
Detection signal
LIMIT signal for the CWIWIW drive
■
・ For the CWIWIW drive, the CWLM and CCWLM signals are used as LIMIT signal.
Input system LIMIT sensor signals for the CWLM and CCWLM signals.
In the CWIWIW drive (SCAW, CCWSTAWT SCAW, and JCW processes), the CWLM signal is detected as a LIMIT
・
stop signal in the + direction and the CCWLM signal is detected as a LIMIT stop signal in the - direction.
・ In the CWW-11 or CWW-12 drive, one of the CWLM and CCWLM signals becomes the machine origin signal.
When the CWIWIW drive start direction is CCW, the CCWLM signal becomes the machine origin signal
and the CWLM signal becomes the LIMIT stop signal.
When the CWIWIW drive start direction is CW, the CWLM signal becomes the machine origin signal and
the CCWLM signal becomes the LIMIT stop signal.
◆ The following drive functions belonging to the CWIWIW drive are handled as drives other than the CWIWIW drive:
IWDEX drive to an address near the machine origin (drive to "machine CFFSET pulse setting address")
・
・ IWDEX drive by the number of PWESET pulses
◆ During execution of the above IWDEX drive, the CWLM and CCWLM signals function as follows:
The CWLM and CCWLM signals function for "CWLM signal input function" and "CCWLM signal input
・
function" defined by the SPEC IWITIALIZE2 command.
If the input function is the LIMIT stop function, the CWIWIW drive is finished after LIMIT is stopped.
・