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Operating instructions

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Electrical installation
4.9 Other connections
Drive converter cabinet units
Operating Instructions, 10/2008, A5E00288214A
83
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- 28 Load data for the braking units
Line voltage Continuous
chopper power
P
DB
Peak chopper
output
P
15
Chopper
P
20
output
P
20
Chopper
P
40
output
P
40
Braking resistor
R
B
Max. current
380 V - 480 V 25 kW 125 kW 100 kW 50 kW 4.4 Ω ± 7.5 % 189 A
380 V - 480 V 50 kW 250 kW 200 kW 100 kW 2.2 Ω ± 7.5 % 378 A
500 V – 600 V 25 kW 125 kW 100 kW 50 kW 6.8 Ω ± 7.5% 153 A
500 V – 600 V 50 kW 250 kW 200 kW 100 kW 3.4 Ω ± 7.5% 306 A
660 V - 690 V 25 kW 125 kW 100 kW 50 kW 9.8 Ω ± 7.5 % 127 A
660 V - 690 V 50 kW 250 kW 200 kW 100 kW 4.9 Ω ± 7.5 % 255 A
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 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 should be provided to protect the braking resistor against
precipitation (in accordance with degree of protection IP20).
CAUTION
A ventilation clearance of 200 m must be maintained on all sides of the braking resistor
(with ventilation grilles).