NORD Drivesystems BU0300 - Manual (Page 25)

2 Assembly and installation
BU 0300 EN Subject to technical alterations 25
2.7 Brake resistor
During dynamic braking (frequency reduction) of a three-phase
motor, electrical energy is returned to the inverter. In order to
avoid overcurrent switch-off of the frequency inverter, the
integrated brake chopper can convert the returned energy into
heat by connecting an external braking resistor.
2 screw connections, which should be fitted with the appropriate
seals, are enclosed for mounting the braking resistor on the
frequency inverter (M20 for the cable and M12 for the holder).
Suitable installation material is provided to mount the brake
resistor on the adapter unit TI 0/2.
CAUTION
The braking resistance and all other metal components can heat up to temperatures above 70°C.
When mounting, sufficient distance from neighbouring components must be maintained. When working
on the components, allow sufficient cooling time beforehand
Contents of the module (TI 0/1)
Screw connections,
for fastening the
braking resistor Braking resistor
Frequency inverter
type
Resistor type
Resis-
tance
Continuous
rating
*) Pulse
output
(approx.)
Connection
leads,
400mm
Protection
type
SK 300E-550-340-B …
SK 300E-151-340-B SK BR3-120/100-TI 0/1
Part. No. 275140010
120 Ω 100 W 1.0 kW
FEP AWG
14/19 wh,gy;
PTFE AWG
12/19 gn
IP67
SK 300E-221-340-B …
SK 300E-401-340-B SK BR3-82/200-TI 0/1
Part. No. 275140020
82 Ω 200 W 2.0 kW
SK 300E-550-340-B …
SK 300E-151-340-B SK BR3-120/100-TI 0/2
Part. No. 275140030
120 Ω 100 W 1.0 kW
SK 300E-221-340-B …
SK 300E-401-340-B SK BR3-82/200-TI 0/2
Part. No. 275140040
82 Ω 200 W 2.0 kW
*) permitted, depending on application, max. 5% ED / 120s (700VDC)