Siemens SINAMICS G130 Engineering Manual page 234

SINAMICS S120
Engineering Information
Voltage Response
Threshold
673 V
380 V – 480 V
3AC
774 V
841 V
500 V – 600 V
3AC
967 V
1070 V
660 V – 690 V
3AC
1158 V
Values of the response threshold for the Braking Modules
When Braking Modules are used, it must be taken in account that they are supplied with cooling air from the fans
installed in the Power Unit. Thus it has to be ensured that these Power Units and the associated fans are supplied
with auxiliary voltage and are in operation, if the Braking Modules are working.
P/P
con
Rated Power
Power, which is permissable for 15 s every 90 s
Power, which is permissable for 20 s every 90 s
Power, which is permissable for 40 s every 90 s
Load diagram for Braking Module and braking resistor
SINAMICS Engineering Manual – May 2008
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© Siemens AG
Switch
position
The factory setting is 774 V. With supply voltages of 380 V to 400 V
1
3AC, the response threshold can be set to 673 V, in order to reduce
the voltage stress of motor and converter. In such cases, the maximum
attainable output power P
of the voltage (673/774)² = 0.75.
2
Thus the maximum available output power is approx. 75 % of P
The factory setting is 967 V. With a supply voltage of 500 V 3AC, the
response threshold can be set to 841 V, in order to reduce the voltage
1
stress of motor and converter. In such cases, the maximum attainable
output power P
voltage (841/967)² = 0.75.
2
Thus the maximum available output power is approx. 75 % of P
The factory setting 1158 V. With a supply voltage of 660 V 3AC the
response threshold can be set to 1070 V, in order to reduce the voltage
1
stress of motor and converter. In such cases, the maximum attainable
output power P
voltage (1070/1158)² = 0.85.
2
Thus the maximum available output power is approx. 85 % of P
Comments
also decreases in proportion to the square
15
also decreases in proportion to the square of the
15
also decreases in proportion to the square of the
15
Two Braking Modules are available.
The rated power is 25 kW resp. 50 kW
(continuous power P
available output power of P
250 kW and a braking time of 15 seconds
based on a cycle of 90 seconds.
Different load duty cycles can be obtained
from the diagram on the left.
Braking Modules with two different voltage
levels are available for units with the large
voltage ranges (input voltage 500 V – 690 V
3AC). Please take note of the possible input
voltages when making the selection of the
Braking Modules.
.
15
.
15
.
15
) with a maximum
DB
of 125 kW resp.
15