Yaskawa PC NC - Manual (Page 185)

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YASNAC PCNC Operating Manual Chapter 4: Maintenance
(c) Deceleration limit switch signal is not input.
Check I/O monitor #3073 DO to D4 while moving an axis at a slow feedrate such as
in jog operation. Make sure feedrate changes as shown in Figure 4.1.7.1.
FIGURE 4.1.7.1: Reference Point Return Control I/O Signals
(d) Parameter setting is incorrect.
Check the setting for the related parameters against the parameter sheet by referring
to Fig. 4.1.7.1.
(e) Position of the dog for the deceleration limit switch is incorrect.
If the dog position is incorrect, the zero point could be shifted by one turn of the motor.
(f) Others (loose coupling or dog)
If another adjustment is incorrect, zero point could shift at random.
(6)Cycle Start is Impossible
(a) Cycle start signal is not input or feed hold signal is open.
Check the I/O monitor #3003 D0 whether it goes “1” when the cycle start switch is
pressed. In this case, the feed hold signal must be open; this can be confirmed by I/O
monitor #3003 D1 = 1.
(b) Start interlock signal is input.
If I/O monitor #3004 D2 = 1, cycle start is impossible.
(c) The NC is in the reset status.
Normal status: I/O monitor #3500 D1 = 0
Also check the external reset signal status.
Normal status: I/O monitor #3004 D1 = 0
(7) G01, G02, or G03 Mode Operation is Impossible
(a) The spindle is in the speed agreed status.
Check whether parameter pm 1000 D7 = 1.