Danfoss VLT AutomationDrive FC 302 Installation Manual

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Danfoss VLT AutomationDrive FC 302 Installation Manual Manual pdf 41 page image

The direction of rotation can be changed by switching twophases in the motor cable or by changing the setting ofparameter 4-10 Motor Speed Direction.Motor rotation check can be performed viaparameter 1-28 Motor Rotation Check and following thesteps shown in the display.175HA036.11U1 V1 W196 97 98FCMotorU2 V2 W2U1 V1 W196 97 98FCMotorU2 V2 W2Figure 4.4 Motor Rotation CheckF-frame requirementsUse motor phase cables in quantities of 2, resulting in 2, 4,6, or 8 to obtain an equal number of wires on bothinverter module terminals. The cables are required to beequal length within 10% between the inverter moduleterminals and the first common point of a phase. Therecommended common point is the motor terminals.Output junction box requirementsThe length, a minimum of 8 ft [2.5 m], and quantity ofcables must be equal from each inverter module to thecommon terminal in the junction box.NOTICE!If a retrofit application requires an unequal number ofwires per phase, consult the factory or use the top/bottom entry side cabinet option, instruction 177R0097.4.6.2 Brake CableAdjustable frequency drives with factory installed brakechopper option(Only standard with letter B in position 18 of type code).The connection cable to the brake resistor must beshielded and the max. length from adjustable frequencydrive to the DC bar is limited to 82 ft [25 m].Terminal No. Function81, 82 Brake resistor terminalsTable 4.3 Terminal FunctionsThe connection cable to the brake resistor must beshielded. Connect the shield with cable clamps to theconductive backplate of the adjustable frequency driveand the metal cabinet of the brake resistor.Size the brake cable cross-section to match the braketorque. See also Brake Instructions for further informationregarding safe installation.WARNINGNote that voltages up to 790 V DC, depending on thesupply voltage, are possible on the terminals.F-frame requirementsThe brake resistors must be connected to the braketerminals in each inverter module.4.6.3 Motor InsulationFor motor cable lengths ≤ the maximum cable length, themotor insulation ratings listed in Table 4.4 arerecommended. The peak voltage can be twice the DC linkvoltage or 2.8 times AC line voltage, due to transmissionline effects in the motor cable. If a motor has lowerinsulation rating, use a dU/dt or sine-wave filter.Nominal AC Line Voltage Motor InsulationUN ≤ 420 V Standard ULL = 1,300 V420 V < UN ≤ 500 V Reinforced ULL = 1,600 VTable 4.4 Recommended Motor Insulation RatingsElectrical Installation Installation ManualMG37A322 Danfoss A/S © Rev. 04/2015 All rights reserved. 394 4