Active front end (NXA) vacon • 165Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/1010.6.4 Technical data10.6.5 Removing discharging resistorsIf the filter is used in a network fitted with an earth fault protection relay, the discharging resistorsshould be removed. If the discharging resistors are not removed, the earth fault monitoring devicemight indicate a very low leakage resistance. The resistors must be connected so that thecapacitors are discharged when disconnecting from the input power. The wiring diagram of analternative 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 eachcapacitors 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 islikely that you will get an electricshock in spite of the fact the system is disconnected from the powersupply.Table 65. VACON ® RLC technical dataAC 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 kHzAmbient conditions Ambient temperatureduring operation -10...+50 °CInstallation temperature 0...+70 °CStorage temperature -40...+70 °C, no liquid in filter under 0 °C.Relative humidity Same as the NXA unit.Enclosure class IP00Liquid cooling Allowed cooling agentsDrinking water, demineralized water or a mixture ofwater and glycol. (To avoid electromechanicalcorrosion it is necessary to add an inhibitor.)Temperature of coolingagent 0...+60 °CCooling agent flow rate 8l/min for one choke, total 32 l/min (for 1pcs Lnetchoke and 3pcs L drive chokes).System max workingpressure 6 barCoolant connection G3/8" female thread x 2 pcs. (1pcs inlet / 1pcs outlet)Protection Over-temperaturemonitoringThermal relay at each winding of the chokes.Thermal relays connected in series betweenterminals 10 and 15. Relay contact type: normallyclosed. Switching temperature: 150 °C.
