NORDAC SK 700E Operating Manual
14
Subject to technical alterations
BU 0700 EN
2.7 UB brake resistors (accessory)
During dynamic braking (frequency reduction) of a three phase motor, electrical energy is returned to the frequency inverter. In
order to avoid overcurrent cut-off of the frequency inverter, the integrated brake chopper can convert the returned energy into
heat by connecting an external brake resistor.
For inverter outputs up to 7.5 kW, a standard substructure resistor can be fitted;
it can also be optionally equipped with a heat monitor for additional
thermal protection of the resistor.
This design is no longer possible with higher frequency
inverter outputs. Instead, the chassis brake
resistors (Chapter 2.8) can be used.
2.7.1 Electrical data UB BR
Inverter type
Resistor type
Resistance
Continuous
output (approx.)
*) Pulse output
(approx.)
Connection
leads, 500mm
SK 700E-151-340-A …
SK 700E-301-340-A
SK BR1-200/300-F
200
Ω
300 W
3 kW
2 x 0.75 mm
2
SK 700E-401-340-A
SK BR1-100/400-F
100
Ω
400 W
4 kW
2 x 0.75 mm
2
SK 700E-551-340-A
SK 700E-751-340-A
SK BR1- 60/600-F
60
Ω
600 W
7 kW
2 x 0.75 mm
2
*) permissible, depending on application, max. 5% ED
2.7.2 Dimensions UB BR
Resistor type
Length
L1
Width
B1
Depth
T
Fixing dimensions
Length L2
Width B2
∅
SK BR1-200/300-F
281 121 48 269
100
5.2
SK BR1-100/400-F
281 121 48 269
100
5.2
SK BR1- 60/600-F
331 121 48 319
100
5.2
All dimensions in mm
