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Siemens SINUMERIK 840C - Page 467

Siemens SINUMERIK 840C
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7 Drive Machine Data (SIMODRIVE Drive MD) 12.93
7.2.2 FDD MD (data description - SW 3)
Derating (reduction) characteristics can be incorporated via this machine data, e.g. derating as
a function of the pulse frequency (MD 1100).
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f
PBM
in kHz
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111,25
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100
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55
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3,2
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MD 1105
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MD 1191 =
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MD 1107
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8 x
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x MD1118
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l
limit
power section
(MD 1108) = min
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8000 - f
PBM
(MD 1100)
100%; 55% + 45% x
––––––––––––––––
8000 - 3200
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I
limit transistor
(MD 1107)
––––––––––––––––––
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I
red. max. motor
(MD 1105) = min
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I
motor
I
limit power section
(MD 1108)
100%;
––––––––––––––––x 100% –––––––––––––––––––x 100%
I
max. motor
(MD 1104) I
max. motor
(MD 1104)
I
motor
= Machining-specific input by user
Example:
I
limit transistor
(MD 1107) = 25 A
Pulse frequency (MD 1100) = 4000 Hz
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I
limit power section
(MD 1108) = min
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8000 - 4000
100%; 55% + 45% x
––––––––––
8000 - 3200
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25
A
––––
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2
I
limit power section
(MD 1108) = min (100%; 92.5%) x 17.678 A
I
limit power section
(MD 1108) = 92.5% x 17.678 A = 16.35 A
I
max. motor
(MD 1104) = 20 A
I
motor
= 15 A
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I
red. max. motor
(MD 1105) = min
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a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
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a
a
a
15 16.35
A
100%;
––––
x 100%;
––––––
x 100%;
20 A 20 A
I
red. max. motor
(MD 1105) = min (100%; 75%; 81.75%)
I
red. max. motor
(MD 1105) = 75 %
7–52 ©
Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)

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