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Electrical installation
4.9 Additional 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 resistor, it has an integrated thermostatic
switch, which is included in the shutdown circuit of the cabinet unit.
Table 4- 39
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
25 kW
500 V ... 600 V
50 kW
660 V ... 690 V
25 kW
660 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 drive. The installation
location must fulfill the following conditions:
● The braking resistors are suitable for floor mounting only.
● The maximum cable length between the cabinet unit and braking resistor is 330 ft
(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.
● A roof is required for compliance with NEMA 1. For outdoor installation, braking resistors
must be installed in an enclosure (NEMA 3R) for protection against falling rain or sleet.
132
Peak chopper
output
P
15
DB
125 kW
250 kW
125 kW
250 kW
125 kW
250 kW
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
Max.
R
current
B
4.4 Ω ± 7.5%
189 A
2.2 Ω ± 7.5%
378 A
6.8 Ω ± 7.5%
153 A
3.4 Ω ± 7.5%
306 A
9.8 Ω ± 7.5%
127 A
4.9 Ω ± 7.5%
255 A
Operating Instructions, 12/2018, A5E36652151A
Option
L61
L62
L64
L65
L61
L62
Enclosed Drives
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