Danfoss VLT AutomationDrive FC 302 Installation Manual

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Long control cables and analog signals may result in 50/60Hz ground loops due to noise from line power supplycables.If ground loops occur, break the shield or insert a 100 nFcapacitor between shield and chassis, if needed.Connect the digital and analog inputs and outputs to thecontrol cards of the units separately to avoid groundcurrents. These connections are on terminals 20, 55, and 39for both the filter and adjustable frequency drive sections.12 13 18 19 27 29 32 33 20 37+24 V DC0 VDC130BT106.10PNP (Source)Digital input wiringFigure 4.14 Input Polarity of Control Terminals, PNPNPN (Sink)Digital input wiring12 13 18 19 27 29 32 33 20 37+24 V DC0 VDC130BT107.11Figure 4.15 Input Polarity of Control Terminals, NPNNOTICE!To comply with EMC emission specifications, shielded/armored cables are recommended. If using non-shielded/armored cable, see chapter 4.7.3 Power and Control Wiringfor Non-shielded Cables. If using non-shielded controlcables, use ferrite cores to improve EMC performance.130BT340.1112Figure 4.16 Connecting Shielded CablesConnect the shields in a proper way to ensure optimumelectrical immunity.4.8.5 Safe Torque Off (STO)To run STO, additional wiring for the frequency converter isrequired. Refer to VLT® Frequency Converters Safe Torque OffOperating Instructions for further information.Electrical Installation VLT® AutomationDrive FC 302 Low Harmonic Drive132–630 kW46 Danfoss A/S © Rev. 04/2015 All rights reserved. MG37A32244