Kw Braking Unit (Option L61/L64); 50 Kw Braking Unit (Option L62/L65); Installing The Braking Resistor - Siemens SINAMICS S150 Operating Instructions Manual

Electrical installation
4.9 Other connections
4.9.11

25 kW braking unit (option L61/L64); 50 kW braking unit (option L62/L65)

Description
Under normal circumstances, the braking energy is supplied back to the line. If a controlled
stop is also required in the event of a power failure, however, additional braking units can be
provided. The braking units comprise a chopper power unit and a load resistor, which must
be attached externally. To monitor the braking resistance, a thermostatic switch integrated in
the shutdown train of the cabinet unit is installed in the braking resistor.
Table 4-29 Load data for the braking units
Supply voltage Continuous
chopper power
P
380 V - 480 V 25 kW
380 V - 480 V 50 kW
660 V - 690 V 25 kW
660 V - 690 V 50 kW
500 V – 690 V 25 kW
500 V – 690 V 50 kW
4.9.11.1

Installing the braking resistor

Installing the braking resistor
The braking resistor should not be installed in the vicinity of the converter. The installation
location must fulfill the following conditions:
● The braking resistors are only suitable for floor mounting.
● The maximum cable length between the cabinet unit and braking resistor is50 m.
● Sufficient space must be available for dissipating the energy converted by the braking
● A sufficient distance from flammable objects must be maintained.
● The braking resistor must be installed as a free-standing unit.
● Objects must not be placed on or anywhere above the braking resistor.
● The braking resistor should not be installed underneath fire detection systems, since
● For outdoor installation, a hood should be provided to protect the braking resistor against
80
Peak chopper
output
P
DB 15
125 kW
250 kW
125 kW
250 kW
125 kW
250 kW
resistor.
these could be triggered by the resulting heat.
precipitation (in accordance with degree of protection IP20).
Chopper Chopper
P output P output
20 40
P P
20 40
100 kW 50 kW
200 kW 100 kW
100 kW 50 kW
200 kW 100 kW
100 kW 50 kW
200 kW 100 kW
Braking resistor
R
B
4.4 Ω ± 7.5 %
2.2 Ω ± 7.5 %
9.8 Ω ± 7.5 %
4.9 Ω ± 7.5 %
6.8 Ω ± 7.5%
3.4 Ω ± 7.5%
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
Max. current
189 A
378 A
127 A
255 A
153 A
306 A