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4. Servo Adjustment
4 - 40
Servo parameter
No. Abbrev. Parameter name Explanation Setting range
SV048 EMGrt Vertical axis drop
prevention time
Input a length of time to prevent the vertical axis from dropping by
delaying Ready OFF until the brake works when the emergency stop
occurs.
Increase the setting by 100ms at a time and set the value where the axis
does not drop.
0 to 20000
(ms)
SV055 EMGx Max. gate off delay
time after
emergency stop
Set a length of time from the point when the emergency stop is input to
the point when READY OFF is compulsorily executed.
Normally, set the same value as the absolute value of SV056.
In preventing the vertical axis from dropping, the gate off is delayed for the
length of time set in SV048 if SV055’s value is smaller than that of SV048.
0 to 20000
(ms)
SV056 EMGt Deceleration time
constant at
emergency stop
In the vertical axis drop prevention time control, set the time constant
used for the deceleration control at emergency stop. Set a length of time
that takes from rapid traverse rate (rapid) to stopping.
Normally, set the same value as the rapid traverse
acceleration/deceleration time constant.
When executing the synchronous operation, put the minus sign to the
settings of both of the master axis and slave axis.
-20000 to
20000 (ms)
Spindle parameter
No. Abbrev. Parameter name Explanation Setting range
SP033 SFNC1* Spindle function 1
F E D C B A 9 8 7 6 5 4 3 2 1 0
poff hzs ront pycal
pychg
pyst pyoff sftk dflt 1a2m
bit Meaning when "0" is set Meaning when "1" is set
F poff Contactor hold at NC power OFF invalid Contactor hold at NC power OFF valid
POINT
1. SV048 and SV055 are set for each axis, but when using MDS-C1-V2 (2-axis
drive unit), the two axes are simultaneously controlled with the larger setting
value for the two axes.
2. If an alarm, for which dynamic brake stopping is designated, occurs with the
axis for which vertical axis drop prevention control is active, the function will
not activate.
3. A drop amount of several µm to several 10µm will remain due to brake play.
CAUTION
1. Do not set the vertical axis drop prevention time longer than required. The
servo control and brakes could collide, resulting in an overload alarm or
drive unit damage. There is no problem if the overlapping time is within
100ms.
2. Vertical axis drop prevention control (including deceleration control) longer
than 100ms will not be guaranteed during a power failure. The operation
will change to dynamic brakes.
3. If only SV048 and SV055 are set, and SV056 is set to 0, the deceleration
stop will be a stepped stop and could result in collision with the machine.