KEB Combivert F5 series Instruction Manual

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KEB Combivert F5 series Instruction Manual Manual pdf 11 page image

11General1.5.6 Motor Thermal ProtectionThe F5 series inverters by default provide motor overload protection at 130% of theinverter's UL rated current.The F5 series inverters are classified as a UL approved solid state overload protectiondevice. It is necessary to activate the function in the software of the inverter. The functionmeets the requirements set forth in VDE 0660 Part 104, UL508C section 42, and NEC430 part C. See parameters dr.11, dr.12 and Pn.14 in the application mode foradjustment.Overload protection using a normally closed contact (min. rating 15V 6mA) or PTC typesensor is also available using terminals T1 and T2. This function also must be activatedby the software of the inverter. See parameters CP.28 or Pn.10.In general, overload protection through current sensing does not always provideprotection against overheating at low speeds; reduced fan cooling. Therefore it isrecommended that a motor winding sensor be used in applications requiringprolonged operation at low motor speeds.1.5.7 High Voltage ConnectionsAlways note inverter voltage, select appropriate over current protection devices, selectdisconnect device, and select proper wire size before beginning the wiring process. Wirethe inverter according to NEC Class 1 requirements.The correct wire gauge for each size inverter can be selected from the charts on pages15-20. Always use UL listed and CSA approved wire. The wire gauge is based on therecomended fuse rating for the inverter and a minimum of 75°C insulation rating. Usecopper wire only. If a lower rated fuse is selected, then it may be possible to use a smallergauge wire. Use 300V rated wire with 230V systems and 600V rated wire with 460Vsystems.The terminal tightening torque can be found for each unit in the same tables.To prevent coupling high frequency noise, the following wires must be spatially separatedfrom each other a minimum distance of 8 inches (20 cm)when they are laid parallel toeach other :- AC supply power and motor lines not connected to inverters- motor lines connected to inverters- control and data lines ( low-voltage level < 48 V )When using KEBCO EMI filters, use only the wire provided with the filter to connect thefilter to the inverter. Do not add additional wire between the filter and the inverter as thiswill have a negative effect on the operation of the filter.