Siemens SINUMERIK 840C Installation Instructions Manual page 899
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Also See for SINUMERIK 840C:
- Installation instructions manual (1154 pages) ,
- Operator's manual (301 pages) ,
- Diagnostics manual (260 pages)
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12 Functional Descriptions
12.16.3 Installation
The acceleration values are derived from | a | = v
acceleration value can easily be varied using the override switch.
Before entering these acceleration values a
1252*, it may be necessary to convert to the input format of the machine data ([mm/s
[100 units MS/s
A monitoring function in the control ensures that incorrect parameterization of the
characteristics for the friction feedforward control are avoided.
The following conditions must be met when entering accelerations a
characteristic.
If this condition is not met, parameter error 328 is output. The user should therefore follow the
input sequence a
328 is also output if internal formats are exceeded as a result of calculation errors when
determining the accelerations from inputs a
whether the break points in the curve have been correctly calculated and/or have been entered
in the correct input format (caution: MD 1252* uses a format factor 100 larger than MDs 1244*
and 1248*!)
Example for setting the characteristic:
a) To derive the actual acceleration
The acceleration when passing through zero speed in a circular path is calculated as
follows:
2
a = v
/r
A radius of 10 mm and a circular velocity of 1 m/min = 16.7 mm/s produces an
acceleration a = 16.7
b) Entering the characteristic break points
The following accelerations were determined as the characteristic break point:
a
= 1.11 mm/s
1
The position control resolution 0.5
1000 units[MS] = 1 mm
The characteristic break points are therefore:
a
= 11100 units/s
1
The following values must therefore be entered in the machine data in the given order:
MD 1252* = 695, MD 1248* = 2778, MD 1244* = 111
a) increase the position control resolution
b) raise the smoothing time constant (MD 1256*), values 100 ms are
recommended
12–124
More user manuals on
2
] and/or [10000 units MS/s
, a
and then a
when entering the acceleration values . Parameter error
3
2
1
2
2
/10 [mm/s
] = 27.78 mm/s
2
2
, a
= 27.78 mm/s
, a
2
.
10 - 4 mm was selected, resulting in:
2
, a
= 277800 units/s
2
If unsatisfactory results are obtained for very low speed values,
ManualsBase.com
2
/r from the radius and travel velocity. The
, a
and a
in machine data 1244*, 1248* and
3
2
1
2
]).
3
a
<a
<a
1
2
3
, a
and a
. If this happens, the user must check
3
2
1
2
.
2
= 695 mm/s
3
2
2
, a
= 6950000 units/s
3
© Siemens AG 1992 All Rights Reserved
12.93
2
]
, a
and a
for the
2
1
6FC5197- AA50
SINUMERIK 840C (IA)
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