Specifications
SINAMICS G150 NEMA
Engineering information
4
Siemens D11.7 (Part 1) – 2013
4/23
Braking units
Braking units
Braking units are used when the drive needs to absorb
regenerative energy occasionally and briefly, for example
when stopping it quickly (emergency stop). The braking
units comprise a braking module and a braking resistor,
which is installed externally.
Two sizes of braking units are available for the SINAMICS
G150 type A enclosed drive with braking powers of 100 kW
(for 150 HP & 200 HP, 460V) and 200 kW (for larger 460 V
and 575V units). For higher braking powers, braking units
may be connected in parallel for larger drives (on request,
not for all ratings).
A thermal contact, which can be integrated into the drive’s
alarm and shutdown sequence, is installed in the braking
resistor for monitoring.
Determining the required braking units and braking resistors
• For periodic duty cycles with a load duration of ≤ 90 s, the
mean braking power value within this duty cycle must be
determined. The relevant period should be used as the
time base.
• For periodic duty cycles with a load duration of ≥ 90 s or
for sporadic braking operations, a 90 s time segment in
which the greatest mean value occurs should be selected.
A 90 s period should be set as the time base.
When determining the required braking unit rating (braking
module and braking resistor), consider both the mean
braking power value and the required peak braking power.
Basic Data
Supply voltage 380 V to 380 V to 500 V to
480 V 480 V 600 V
Enclosed drive SINAMICS 150 HP to 250 HP to 150 HP to
G150 type A 200 HP 800 HP 800 HP
Braking module 25 kW 50 kW 50 kW
Continuous power
P
DB
Braking module 50 kW 100 kW 100 kW
Power
P
40
Braking module 100 kW 200 kW 200 kW
Rated power
P
20
Braking module 125 kW 250 kW 250 kW
Peak power
P
15
Braking resistor
R
B
4.4 Ω 2.2 Ω 3.4 Ω
±7.5% ±7.5% ±7.5%
Max. current 189 A 378 A 306 A
Option code L61 L62 L62
Load diagram
Calculating the P20 power
To reduce the voltage stress on the motor and drive, the
response threshold at which the braking unit is activated
and the DC bus voltage generated can be reduced. For
example, the DC bus voltage for the drives in the voltage
range from 380 V to 480 V can be reduced from 774 V to
673 V. This also reduces the possible peak power. A factor
of 1.06, rather than a factor of 0.8 should be used.
The ON/OFF states of the braking module are controlled by
a 2-point controller. The respective response thresholds are
shown in the following table:
Drive voltage range Braking unit response threshold
380 V to 480 V 774 V (673 V)
500 V to 600 V 967 V (841 V)
15
P
20
P
40
P
DB
P
DB
P
15
P
20
P
40
P
t
=
=
5
x
=
Power
which
is
permissible
every
90
s
for
15
s
=
4
x
=
Power
which
is
permissible
every
90
s
for
20
s
=
2
x
=
Power
which
is
permissible
every
90
s
for
40
s
1.00
10
20
30
40
50
60
70
80
90
100
0.75
0.50
0.25
s
1.50
1.25
DB
P
/ P
DB
P
15
DB
P
DB
P
Rated power
G_D211_EN_00013a