Siemens SINUMERIK 840C User Manual
Page 467
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).
f
PBM
in kHz
111,25
100
55
3,2
8
2
%
MD 1105
,
MD 1191 =
MD 1107
8 x 2 x MD1118
l
limit
power section
(MD 1108) = min
8000 - f
PBM
(MD 1100)
100%; 55% + 45% x
––––––––––––––––
8000 - 3200
I
limit transistor
(MD 1107)
––––––––––––––––––
x
2
I
red. max. motor
(MD 1105) = min
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
I
limit power section
(MD 1108) = min
8000 - 4000
100%; 55% + 45% x
––––––––––
8000 - 3200
25 A
––––
x
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
I
red. max. motor
(MD 1105) = min
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
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SINUMERIK 840C (IA)