Kw Braking Unit (Option L61); 50 Kw Braking Unit (Option L62) - Siemens SINAMICS G150 Operating Instructions Manual

Electrical installation
4.11 Other connections
4.11.15

25 kW Braking Unit (Option L61); 50 kW Braking Unit (Option L62)

Description
Braking units are used when regenerative energy occurs occasionally and briefly, for
example when the brake is applied to the drive (emergency stop). The braking units
comprise a chopper power unit and a load resistor, which must be attached externally. To
monitor the braking resistor, it has an integrated thermostatic switch, which is included in the
shutdown circuit of the cabinet unit.
Table 4- 49 Load data for the braking units
Line voltage Continuous
chopper power
P
380 V ... 480 V 25 kW
380 V ... 480 V 50 kW
500 V ... 600 V 50 kW
660 V ... 690 V 25 kW
660 V ... 690 V 50 kW
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 is 100 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 must be provided to protect the braking resistor from
CAUTION
A ventilation clearance of 200 m must be maintained on all sides of the braking resistor
(with ventilation grilles).
140
Peak chopper
output
P
DB 15
125 kW
250 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
200 kW 100 kW
100 kW 50 kW
200 kW 100 kW
Operating Instructions, 03/2012, A5E03263466A
Braking resistor Max. current
R
B
4.4 Ω ± 7.5 % 189 A
2.2 Ω ± 7.5 % 378 A
3.4 Ω ± 7.5 % 306 A
9.8 Ω ± 7.5 % 127 A
4.9 Ω ± 7.5 % 255 A
Converter cabinet units