Brake chopper unit (NXB) vacon • 201
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
12
12.4 Brake chopper unit technical data
*) NX_8 AC drives only available as Ch6x AFE/BCU/INU units.
Table 97. Technical specification for VACON
®
NXB Liquid-Cooled brake chopper unit
Supply connection
Input voltage U
in
NX_5: 400…500 VAC (–10%…+10%); 465…800 VDC
(–0%…+0%)
NX_6: 525…690 VAC (–10%…+10%); 640…1100 VDC
(–0%…+0%)
NX_8: 525…690 VAC (–10%…+10%); 640…1136 VDC
(–0%…+0%)*)
Input current
DC I
in
~ I
out
DC bank capacitance
Voltage class 500 V: Ch3 (16-31A units): 600 μF
Ch3 (38-61A units): 2400 μF
CH4: 2400 μF
CH5: 7200 μF
CH61: 10800 μF
CH62: 10800 μF
Voltage class 690 V: CH61: 4800 μF
CH62: 4800 μF
Starting delay 2…5 s
Resistor connection
Output voltage
U
in
~ U
out
Continuous output
current
I
br
: Max ambient temperature +50 °C
Connection order
R1 U – DC+
R2 W – DC-
Control
characteristics
Control method
Voltage level control, default U
n
+18%
Parallel BCU Requires synchronization
Ambient conditions
Ambient operating
temperature
–10 °C (no frost)…+50 °C (at I
th
)
The VACON
®
NX Liquid-Cooled drives must be
used in a heated indoor controlled environment
Installation temperature 0...+70 °C
Storage temperature –40 °C…+70 °C; No liquid in heatsink under 0 ºC
Relative humidity 5 to 96% RH, non-condensing, no dripping water
Air quality:
- chemical vapours
- mechanical
particles
IEC 721-3-3, unit in operation, class 3C2
IEC 721-3-3, unit in operation, class 3S2
• No conductive dust allowed
• No corrosive gases
Altitude
NX_5 (380...500 V): max. 3000 m (in case network
is not corner grounded)
NX_6: max. 2000 m. For further requirements,
contact factory 100-% load capacity (no derating)
up to 1,000 m; above 1,000 m derating of
maximum ambient operating temperature
by 0.5 °C per each 100 m is required.
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