bnp-b2365(eng)b.pdf - 第239页
4. Servo Adjustment 4 - 40 Servo parameter No. Abbrev . Parameter nam e Explanation Setting range SV048 EMGrt V erti cal axis drop prevention time Input a length of time to prevent the vertic al axis from dropping by del…
4. Servo Adjustment
4 - 39
4-5-2 Vertical axis drop prevention control
(1) Vertical axis drop prevention control
The vertical axis drop prevention control is a function that prevents the vertical axis from dropping due
to a delay in the brake operation when an emergency stop occurs. The no-control time until the brakes
activate can be eliminated by delaying the servo READY OFF state by the time set in the parameters
when an emergency stop occurs.
Always use this function together with deceleration control.
<Setting procedures>
[1] Apply emergency stop while viewing the current position on the NC screen. Adjust the vertical
axis drop prevention time (SV048), and set the minimum delay time at which the axis does not
drop.
[2] Set the same value as the adjusted vertical axis drop prevention time (SV048) for the max. gate
off delay time after emergency stop (SV055).
[3] For the axis for which the vertical drop is to be controlled, set the same value as the
acceleration/deceleration time constant for the deceleration control time constant at emergency
stop (SV056).
[4] If the vertical axis is MDS-C1-V2 (2-axis drive unit), set the servo parameters for the other axis
in the same unit.
SV048 = Same value as adjusted vertical axis SV048
SV055 = Same value as adjusted vertical axis SV055
SV056 = Same value as that axis' rapid traverse acceleration/deceleration time constant
[5] Set the spindle parameter SP033/bitF=1 when the converter that supplies PN power to the
vertical axis is controlled by the spindle amplifier.
[6] If the converter that supplies PN power to the vertical axis is controlled by a different servo
amplifier, set the servo parameter setting for that axis as well. (Same as item [4] above).
Vertical axis drop prevention control sequence
CAUTION
1. Always set deceleration control when using the vertical axis drop
prevention control setting.
2. Configure so that the power supply unit is controlled directly by the servo
drive unit which controls the spindle drive unit or the vertical axis drop
prevention control.
3. 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. To prevent axis dropping under all conditions, provide
measures on the machine side by installing a balance unit, etc.
Motor brake control output (CN20)
OFF
ON
Servo READY (READY)
ON
OFF
Emergency stop (EMG)
ON
OFF
SV048
Motor brake actual operation (BRK)
OFF
ON
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.
4. Servo Adjustment
4 - 41
<Outline of system configuration s and corresponding parameter settings>
[1] Spindle controls power supply, vertical axis is a 1-axis unit (vertical axis: Z axis)
MDS-C1-V2
X axis, Y axis
MDS-C1-V1
*Z axis
MDS-C1-SP
Spindle
MDS-C1-CV
Power supply
X axis Y axis Z axis (Vertical axis) Spindle
Axis
Parameter
MDS-C1-V2 MDS-C1-V1 MDS-C1-SP
SV048 - - Set by adjustment
SV055 - - Same value as SV048
SV056 - -
Same value as Z axis
rapid traverse time
constant
Spindle parameter
SP033/bitF=1
[2] Spindle controls power supply, vertical axis is a 2-axis unit (vertical axis: Z axis)
MDS-C1-V1
X axis
MDS-C1-V2
Y axis, *Z axis
MDS-C1-SP
Spindle
MDS-C1-CV
Power supply
X axis Y axis Z axis (Vertical axis) Spindle
Axis
Parameter
MDS-C1-V1 MDS-C1-V2 MDS-C1-SP
SV048 -
Same value
as Z axis
→
Set by adjustment
SV055 -
Same value
as Z axis
→
Same value as SV048
SV056 -
Same value as Y axis
rapid traverse time
constant
Same value as Z axis
rapid traverse time
constant
Spindle parameter
SP033/bitF=1
NC
NC