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Mitsubishi Electric MELDAS C6 Interface Manual Page 257

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B con-
Signal name
tact
TAP RETRACT
[Function]
This function is used to remove the tap from the workpiece when tap cycle has been stopped due to
emergency stop, etc.
[Operation]
If the "Tap retract" signal (TRV) is turned ON while the "Tap retract possible" signal (TRVE) is ON
due to an interruption in the tap cycle, the tap retract operation can be started.
(1) The following items are conditions for tap retract. (The "Tap retract possible" signal will turn ON
at this time.)
Emergency stop during tap cycle
Reset during tap cycle
Power OFF during tap cycle (Only for absolute position detection system)
(2) Tap retract is executed as follows:
Execute the synchronous tap cycle command.
Stop the tap cycle with emergency stop.
The "Tap retract possible" signal (TRVE) turns ON.
Release the emergency stop. (The "Servo-ready" signal (SA) turns ON.)
Turn ON the "Tap retract" signal (TRV).
The spindle will rotate in reverse, and the tap axis will move toward the tap cycle's initial point.
The feedrate is the tap cycle feedrate.
When the tap axis reaches the tap cycle initial point, the spindle and tap axis will stop, and
tap retract will be completed.
The "Tap retract possible" signal (TRVE) will turn OFF.
Normal tap cycle
Tap cycle command
a b
Tap feed (spindle
normal run)
(Note 1) The area between "c" and "e" above is the tap cycle. The "Tap retract possible" signal will
not be output if the operation is not stopped in this area.
(Note 2) This signal is valid only during rising in the tap cycle.
(Note 3) When this signal turns ON during emergency stop or reset state, tap retract will not be
executed.
[Related signals]
Tap retract possible (TRVE: X66D)
6. EXPLANATION OF INTERFACE SIGNALS
6.3 PLC Output Signals (Bit Type: Y***)
Signal
abbreviation
TRV
f Initial point
c
e R point
(Spindle
reverse run)
d
Tap base
1st system
Y75C
(1)
(2)
(3)
(5)
(6)
(7)
Tap retract operation
Tap cycle command
1
a b
R point c
Tap feed
(spindle normal
rotation)
2
Emergency stop
Stop
3
4
Emergency stop
release
d
Tap base
6-3-60
2nd system
3rd system
Y83C
Y91C
(4)
7
Stop
f Initial point
6
Tap retract operation
(spindle reverse
rotation)
5
Tap retract

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