SIEMENS
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Siemens D 21.4 · 2017
Tools and configuration
Configuration notes
System components
13
■
Configuration
(continued)
Basic data
Load diagram
Braking resistors for Power Modules in blocksize format
The braking resistors for frame sizes FSA and FSB must be
externally mounted. Braking resistors for frame sizes FSC to FSF
should be mounted outside the control cabinet due to their high
heat losses.
The Control Unit monitors the pulse/pause ratio (ON time/OFF
time) of the braking resistor and shuts it down on faults if it
calculates that the resistor could overheat.
Braking resistors feature a temperature switch with NC contacts
that open when the permissible temperature is exceeded. The
temperature switch must be evaluated to prevent consequential
damage if the braking resistor overheats.
The braking power
P
mech
on the motor shaft is higher than the
power loss of the braking resistor, as this only needs to convert
the DC link energy into heat. The DC link power
P
d
of the Power
Module in generator mode is calculated from the shaft power
P
mech
of the motor and the power loss in the motor
P
v Motor
and
in the Power Module
P
v Power Module
as:
P
d
=
P
mech
–
P
v Motor
–
P
v Power Module
=
P
braking resistor
The power losses can be estimated from the efficiency values of
the motor
η
m
and Power Module
η
wr
:
P
braking resistor
=
P
d
=
P
mech
×
η
m
×
η
wr
Booksize format Capacitor Module
The Capacitor Module functions as a short-term energy buffer,
e.g. for bridging brief power failures or for storing braking
energy. The buffered energy
W
can be calculated with the
following formula:
W
= ½ ×
C
× (
U
d1
2
–
U
d2
2
)
C
= effective capacity of Capacitor Module 4 mF
U
d1
= DC link voltage when buffering starts
U
d2
= DC link voltage when buffering ends
Example:
U
d1
= 600 V;
U
d2
= 430 V
The resultant energy calculation is
W
= 350 Ws
With this energy, for example, it is possible to buffer a Motor
Module with 3 kW load for about 100 ms.
Booksize format Control Supply Module
The Control Supply Module provides a 24 V DC power supply
via the line or DC link in order to maintain the electronics power
supply for the components in the event of a line failure. This
makes it possible, for example, to make emergency retraction
movements in the event of the failure of the line supply.
Supply
voltage
Power range
Motor Modules
Braking
Module
con-
tinuous
power
P
DB
Braking
Module
power
P
40
Braking
Module
power
P
20
Braking
Module
peak
power
P
15
380 … 480 V
110 … 132 kW
25 kW
50 kW
100 kW
125 kW
160 … 800 kW
50 kW
100 kW
200 kW
250 kW
660 … 690 V
75 … 132 kW
25 kW
50 kW
100 kW
125 kW
160 … 1200 kW
50 kW)
100 kW
200 kW
250 kW
15
P
20
P
40
P
15
P
20
P
40
P
15
s 100
90
80
70
60
50
40
30
20
10
t
G_D211_EN_00013b
= Rated power
DB
DB
DB
= 5 x
P
= Power which is permissible every 90 s for 15 s
= 4 x
P
= Power which is permissible every 90 s for 20 s
= 2 x
P
= Power which is permissible every 90 s for 40 s
DB
P
DB
P
/
P
DB
1.25
1.50
0.25
0
0.50
0.75
1.00
P
© Siemens AG 2017