
B–65162E/03
10. INTERFACE SIGNALS
377
If the back rotation command is transmitted, the spindle motor starts
deceleration and, because the arrival signal becomes 0 at under 40 ms,
it next detects the speed arrival signal has again become 1 via speed
zero and sets the end of the back command.
D This signal is used as the confirmation signal (FIN signal) for the
forward rotation (M03) and back rotation (M04) commands.
D Assume that the maximum output (10 V) of the load meter (LM) is
100%. When the output of the load meter reaches the parameter
settings (%), load detection signal is set to 1.
D Parameter settings for these signals are set independently.
D Using these signals, the PMC reduces the feedrate or stops the feed to
prevent the spindle from stopping when cutting overload is applied to
the spindle.
D The following example shows the case in which the spindle is
controlled with two load-detection levels set.
Feedrate is reduced here.
The spindle stops.Cutting
starts.
LDT2A threshold level
LDT1A threshold level
Output of the load meter
The feed motor stops here.
LDT1A
LDT2A
0V
D When using only one load-detection level to stop the feed motor,
perform spindle control according to the specifications.
D After the speed command is changed, this signal is not output until 10
seconds elapse. (The delay is specified by parameter. (For FS–16, this
parameter is 4082))
10.2.13
Load Detection Signal
(LDT1A, LDT2A)