Braking Unit 50 Kw (Option L62) - Siemens Sinamics G120P Operating Instructions Manual

Electrical installation
4.9 Other connections
4.9.11

Braking unit 50 kW (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). Braking units
comprise a Braking Module and a braking resistor, which must be fitted 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- 42 Load data for the braking units
Line voltage
380 V ... 480 V
Installing the braking resistor
The braking resistor should not be installed in the vicinity of the inverter. 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
resistor.
● 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
these could be triggered by the resulting heat.
● For outdoor installation, a hood must be provided to protect the braking resistor from
precipitation (in accordance with degree of protection IP20).
Danger to life due to fire for an inadequate installation
If an inadequate installation is performed (non-observance of the cooling clearances or
inadequate separations to inflammable objects), there is the danger of fire damage with
death or severe injury.
• It is essential that you maintain a cooling clearance of 200 mm on all sides of the
• Maintain sufficient clearance to objects that can burn.
116
Continuous chopper
power
P
DB
50 kW
WARNING
braking resistor with ventilation grills.
Chopper Braking resistor
P output
20
P
20
200 kW 3.1 Ω ± 8%
Operating Instructions, 12/2014, A5E32923362A
Max. current
R
B
275 A
Inverter cabinet units