NORD Drivesystems BU0700 - Manual (Page 15)

2 Assembly and installation
BU 0700 GB-1411 Subject to technical alterations 15
B1
L1
B2 L2
T
2.8 Chassis brake resistors (accessory)
During dynamic braking (frequency reduction) of a three phase motor, electrical energy is released and returned to the
frequency inverter. To prevent a safety shut-down of the frequency inverter, the integrated brake
chopper can be activated by the connection of an external brake resistor.
The returned energy is converted into heat, so avoiding a possible overvoltage.
All chassis resistors are UL certified and are not subject to
restrictions in the North American market.
Connection is with screw connectors that are designated +B, -
B (1.5-22kW) or BR, +ZW (30-160kW), and the safety leads.
For overload protection, a thermal switch is located close to
a brake resistor. The switch is freely available via the
screw connectors (2 x 4mm
2
). The switching capacity is
limited to 250VAC/10A, 125VAC/15A and 30VDC/5A.
2.8.1 Electrical data Chassis BR
Inverter type
NORDAC SK 700E
Resistor type Resistance
Continuous
output (approx.)
*) Pulse output
(approx.)
Connection
terminals
1.5 ... 2.2 kW SK BR2- 200/300-C 200
 300 W 3 kW 10 mm
2
3.0 ... 4.0 kW SK BR2- 100/400-C 100
 400 W 6 kW 10 mm
2
5.5 ... 7.5 kW SK BR2- 60/600-C 60

600 W 9 kW 10 mm
2
11 ... 15 kW SK BR2- 30/1500-C 30

1500 W 20 kW 10 mm
2
18.5 ... 22 kW SK BR2- 22/2200-C 22

2200 W 28 kW 10 mm
2
30 ... 37 kW SK BR2- 12/4000-C 12

4000 W 52 kW 10 mm
2
45 ... 55 kW SK BR2- 8/6000-C 8

6000 W 78 kW 10 mm
2
75 ... 90 kW SK BR2- 6/7500-C 6
 7500 W 104 kW 25 mm 2
110 ... 160 kW SK BR2- 3/7500-C 3
 7500 W 110 kW 25 mm 2
*) permissible, depending on application, max. 5% ED
2.8.2 Dimensions Chassis BR
Resistor type
Length
L1
Width
B1
Depth
T
Fixing dimensions
Length L2 Width B2

SK BR2- 200/300-C
100 170 240 90 150 4.3
SK BR2- 100/400-C
SK BR2- 60/600-C 350 92 120 325 78 6.5
SK BR2- 30/1500-C 560 185 120 530 150 6.5
SK BR2- 22/2200-C 460 270 120 430 240 6.5
SK BR2- 12/4000-C 560 270 240 530 240 6.5
SK BR2- 8/6000-C 470 600 300 440 2 x 220 6.5
SK BR2- 6/7500-C
570 600 300 540 2 x 220 6.5
SK BR2- 3/7500-C
All dimensions in mm
Basic diagram,
design varies according to output