Kw Braking Unit (Option L61); 200 Kw Braking Unit (Option L62) - Siemens SINAMICS G150 Operating Manual

11/03
4.9.10 100 kW Braking Unit (Option L61); 200 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. A thermostat, which is integrated in the shutdown train of the cabinet
unit, is installed in the braking resistor to monitor it.
Table 4-25 Load data for the braking units
Line voltage Cont.
chopper
power
P
DB
380 V – 480 V 25 kW
380 V – 480 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
maximum cable length between the cabinet unit and the braking resistor is 50 m.
Sufficient space must be available for dissipating the energy converted by the
braking resistor. There must be sufficient clearance to flammable objects. The
braking resistor must installed as a free-standing unit. Objects must not be placed
on or anywhere above the braking resistor.
CAUTION
A ventilation clearance of 200 m must be maintained on all sides of the braking
resistor (with ventilation grilles).
Table 4-26 Braking resistor dimensions
Unit
Length mm
Width mm
Height mm
SINAMICS G150
Operating Manual
Chopper Rated chopper
power power
P
20
P
40
50 kW 100 kW
100 kW 200 kW
50 kW 100 kW
100 kW 200 kW
100 kW resistor (option L61)
740
485
605
Electrical Installation
Peak Braking
chopper resistor
power
P R
15 B
4.4 Ω ± 7.5 %
125 kW
2.2 Ω ± 7.5 %
250 kW
125 kW 9.8 Ω ± 7.5 %
4.9 Ω ± 7.5 %
250 kW
200 kW resistor (option L62)
810
485
1325
Max. current
189 A
378 A
127 A
255 A
4-33