SIEMENS
SINAMICS DCM
Accessories and supplementary components
SICROWBAR DC
4/28
Siemens D 23.1 · 2014
4
■
Configuration
The complete arrangement comprises a SICROWBAR DC
overvoltage protection and de-excitation/discharge resistor.
The following device parameters that are used to select the
device must be determined:
1.
The firing voltage – if this is reached, then the thyristors of the
SICROWBAR DC are turned on.
2.
The maximum current that flows or the maximum
I
2
t
value
that occurs.
Detailed information about configuration, applicable standards
and connection of the overvoltage protection are provided in the
operating instructions or on the Internet at:
•
For units 7VV3003-5...:
WW/view/en/21696826
•
For units 7VV3003-6...:
WW/view/en/86152590
Typical load current characteristic
7VV3003-5...:
7VV3003-6...:
Cooling time
7VV3003-5...:
7VV3003-6...:
= 4.34 s
here:
10 %
I
max
10 s
t
[s]
G_D023_EN_00076
-5KG32
-5LG32
-5MG32
7VV3003-5JG32
-5FG32
-5GG32
-5HG32
7VV3003-5EG32
-5BG32
-5CG32
-5DG32
7VV3003-5AG32
I
[A]
30
25
20
15
10
5
0
12000
10000
8000
6000
4000
2000
0
Tp [s]
I
DC
[A]
I
DC
as function of Tp
G_D023_EN_00093
0.1
10
1
250
300
350
200
150
100
50
0
Single trigger is periodically possible after 30 min
cooling-down time.
30 min
30 min
30 min
G_D023_EN_00075
t
*
*
*
Single trigger is periodically possible after 30 min
cooling-down time.
30 min
30 min
30 min
G_D023_EN_00075
t
*
*
*
After being triggered twice in a time period
< 30 min, a cooling-down time of 300 min is
required.
300 min
300 min
G_D023_EN_00077
t
* *
* *
© Siemens AG 2014