
B-63494EN/02 11.APPLYCATION OF OTHER FUNCTIONS
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11.2.2 Specifications
External deceleration speed
The external deceleration speed is set for each of rapid traverse and
cutting feed. Three sets of external deceleration speeds and external
deceleration signals are provided as external deceleration settings 1, 2,
and 3, which can be selected depending on the operator's skill or
machine condition. When multiple cutting conditions are provided, the
lowest deceleration speed is selected. External deceleration settings 2
and 3 can be disabled by the parameters EXD2 and EXD3.
Since the dual check safety function monitors the safe speed for both
rapid traverse and cutting feed, the external deceleration speed of the
cutting feed must be set according to the axis having the lowest safe
speed.
External deceleration signal
For safety, external deceleration is enabled when the external
deceleration speed signal is 0, and disabled when the signal is 1. Two
signals in the positive and negative directions are provided for each
axis to select a deceleration direction. For manual handle feed,
however, when either the signal in the positive direction or the signal
in the negative direction is 0, external decelerations in both directions
are enabled (it is impossible to select one direction).
JOG feed
For JOB feed, the external deceleration speed of rapid traverse is
enabled.
Manual handle feed
The maximum speed of manual handle freed is normally the manual
rapid traverse rate, but can be the maximum speed set in the parameter
with the maximum speed switching signal. However, another speed
can be selected by the external deceleration function depending on the
external deceleration signal.
Relationships between signals and parameters
For cutting feed, rapid traverse, and JOG feed, the relationships
between external deceleration settings, external signals, and
parameters are shown in the table below.
Signal Parameter
Valid/Invalid External deceleration speed
Settings
External
deceleration
signal
Positive
direction
Negative
direction
Cutting feed
Rapid traverse
JOG feed
1 G118, G120 No.1005#4(*1) No.1005#5(*1) No.1426 No.1427
2 G101, G103 No.1406#0 No.1440 No.1441
3 G107, G109 No.1406#1 No.1443 No.1444
(*1) Only when external deceleration is enabled in cutting feed, bits 4
and 5 of parameter No. 1005 must be set to 1. (In rapid traverse
and JOG feed, external deceleration is enabled regardless of this
setting.)