Vacon NX User Manual

Active front end (NXA) vacon • 165
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
10
10.6.4 Technical data
10.6.5 Removing discharging resistors
If the filter is used in a network fitted with an earth fault protection relay, the discharging resistors
should be removed. If the discharging resistors are not removed, the earth fault monitoring device
might indicate a very low leakage resistance. The resistors must be connected so that the
capacitors are discharged when disconnecting from the input power. The wiring diagram of an
alternative discharging circuit can be seen in Figure 91. The discharging resistors should be 10 kΩ,
500 V and 2 W. Failure to ensure the discharging of capacitors take a very long time to discharge.
Figure 92 and Figure 93 have a blue marking on the lead that has to be removed from each
capacitors if the discharge resistor is not to be used.
WARNING! If you do not allow a total discharge of the system before starting the modification, it is
likely that you will get an electricshock in spite of the fact the system is disconnected from the power
supply.
Table 65. VACON
®
RLC technical data
AC connections
Voltage U
in
Same as the NXA unit.
Frequency f
in
50 or 60 Hz + 2%.
Continuous output cur-
rent
See current rating of filter.
Switching frequency 3.6 kHz
Ambient conditions
Ambient temperature
during operation
-10...+50 °C
Installation temperature 0...+70 °C
Storage temperature -40...+70 °C, no liquid in filter under 0 °C.
Relative humidity Same as the NXA unit.
Enclosure class IP00
Liquid cooling Allowed cooling agents
Drinking water, demineralized water or a mixture of
water and glycol. (To avoid electromechanical
corrosion it is necessary to add an inhibitor.)
Temperature of cooling
agent
0...+60 °C
Cooling agent flow rate
8l/min for one choke, total 32 l/min (for 1pcs L
net
choke and 3pcs L
drive
chokes).
System max working
pressure
6 bar
Coolant connection G3/8" female thread x 2 pcs. (1pcs inlet / 1pcs outlet)
Protection
Over-temperature
monitoring
Thermal relay at each winding of the chokes.
Thermal relays connected in series between
terminals 10 and 15. Relay contact type: normally
closed. Switching temperature: 150 °C.

Vacon NX Specifications

General

Product Type	AC Drive
Control Method	Scalar Control
Enclosure	IP00, IP21
Communication	Ethernet
Safety	STO (Safe Torque Off)
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short Circuit
Ambient Temperature Range	-10°C to +50°C (with derating above +40°C)
Cooling Method	Air-cooled, Liquid-cooled