SIEMENS
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Siemens D 21.4 · 2017
Tools and configuration
Configuration notes
System components
13
■
Configuration
(continued)
Braking Modules and braking resistors for booksize format
To operate booksize format Braking Modules, a minimum
capacitance is required in the DC link. This capacitance is
determined by the braking resistor used.
Braking resistor 0.3 kW/25 kW
→
DC link capacitance 220
μ
F
Braking resistor 1.5 kW/100 kW
→
DC link capacitance 330
μ
F
The capacitance of the booksize format Braking Module of
110
μ
F is included in the total capacitance value. If the DC link
capacitance is not sufficient for the use of one or more Braking
Modules, a Capacitor Module can be added to increase the
effective DC link capacitance of the drive line-up.
When booksize format Braking Modules are connected in
parallel, the minimum capacitance specified above must be
available for each Braking Module.
Note
: Only booksize format modules that are directly connected
to each other via the DC link busbar can be included in the total
capacitance.
If the DC link capacitance is not sufficient for the operation of a
number of Braking Modules, Capacitor Modules can be used to
increase the DC link capacitance. The max. permissible DC link
capacitance of a drive line-up on a Line Module must be taken
into account. The max. DC link capacitances to be taken into
account for pre-charging current limiting on the Line Modules
are listed in the technical specifications for the Line Modules.
The braking resistor discharges the excess energy from the
DC link:
Duty cycle for braking resistors
Braking Modules and braking resistors for chassis format
Braking Modules with a braking power of 25 kW (for frame size
FX) and 50 kW (for frame sizes GX, HX and JX) are available with
matching braking resistors for chassis format units. Braking units
can be connected in parallel to obtain higher braking powers. In
this case, the units can be installed at the Line Module end or
Motor Module end.
When a Braking Module is installed in a Basic Line Module of
size GB/GD, the cables supplied for the DC link connection are
too short. In this case, the cable harness set
6SL3366-2NG00-0AA0 must be ordered to make the Braking
Module connection.
The Braking Module features an electronics interface (X21) with
monitoring function. The braking resistor housing contains a
monitoring thermocontact. Both these monitors can be inte-
grated into the warning or shutdown circuits of the drive system.
Calculation of Braking Module and braking resistor requirements
•
For periodic duty cycles with a cycle duration of
≤
90 s, the
average value of the braking power within this duty cycle must
be defined. The relevant cycle duration must be applied as
the time base.
•
For periodic duty cycles with a cycle duration of
≥
90 s or for
sporadic braking operations, a time interval of 90 s in which
the highest average value occurs must be selected. The 90 s
period must be applied as the time base.
Apart from the average braking power, the required peak
braking power must also be taken into account when braking
units are selected (Braking Module and braking resistor).
P
max
P
0 kW
t
0 kW
t
a
t
t
a
t
Period of braking duty cycle in s
t
a
Load duration in s
P
DB
Continuous power of braking resistor in kW
P
max
Peak power of braking resistor in kW
G_D212_EN_00018a
P
DB
Frame
size
Rated power
P
DB
power
Peak power
P
15
Max. possible
mounting
locations for
Braking
Module
FB
25 kW
125 kW
1
GB/GD
50 kW
250 kW
1
FX
25 kW
125 kW
1
GX
50 kW
250 kW
1
HX
50 kW
250 kW
2
JX
50 kW
250 kW
3
© Siemens AG 2017