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Rapid traverse
December 2001
To use feedback control with velocity semifeedforward:
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Activate the velocity feedforward control with MP1391 and/or MP1392.
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Determine the k
factor for velocity feedforward control (MP1510.x).
v
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Activate the velocity semifeedforward control by entering the desired factor
in MP1396.x.
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Determine the k
factor for velocity semifeedforward control (MP1516.x).
v
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Enter MP1396.x = 1 to return to velocity feedforward control.
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For example, you may now use FN17: SYSWRITE ID 600 in an OEM cycle
to overwrite or reestablish the factor in MP1396.x.
MP1396.0-8 Feedback control with velocity semifeedforward
for axes 1 to 9
Input:
0.001 to 0.999
1: Velocity feedforward control
MP1516.0-8 k
factor for velocity semifeedforward for axes 1 to 9
V
Input:
0.100 to 20.000 [(m/min)/mm]
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In MP1010.x, define for each axis the rapid traverse of the machine.
You can reduce this value through the PLC:
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Enter the reduced value in D596.
If the value in D596 is larger than MP1010.x, then MP1010.x becomes
effective.
After the control is switched on, or after an interruption of the PLC run, D596
is preassigned with the value 300 000 so that MP1010.x becomes effective.
Rapid traverse can be limited by the user with the F MAX soft key. This
limitation is not effective if M4587 is set. In this case only limitation through
D596 is effective. After M4587 is reset, both D596 and the last limit set via F
MAX soft key are effective again.
For manual operation the feed rate is significantly lower than for rapid traverse:
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Enter in MP1020 a feed rate for manual operation.
The programmed feed rate and the current path feed rate are saved in D360
and D388 in mm/min. In the manual operating modes the highest axis feed
rate of all axes is saved in D388 (as of NC software 280 476-01).
The maximum possible feed rate depends on the encoder being used.
v
[mm/min] = P [mm] · f
max
v
= Maximum traversing speed
max
P = Signal period of the encoder
f
= Input frequency of the encoder input, (See "Encoders" on page 3 – 31) and
i
(See "Encoder signals" on page 6 – 9).
The Control Loop
[kHz] · 60
i
6 – 127
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