Nidec DFS Series Power Installation Manual

DFS1/DFS2 Power Installation Guide 57Issue Number: 2Safety information Product information Mechanical installation Electrical installation Technical dataThe following data applies to the drive only; it does not include the performance of the source of thecontrol signals.Open loop resolution:Preset frequency reference: 0.1 HzPrecision frequency reference: 0.001 HzClosed loop resolution:Preset speed reference: 0.1 rpmPrecision speed reference: 0.001 rpmAnalog input 1: 11 bit plus signAnalog input 2: 11 bit plus signCurrent:The resolution of the current feedback is 10 bit plus sign.Accuracy: typical 2 %worst case 5 %5.1.13 Acoustic noiseThe acoustic noise levels are as follows:Minimum speed: 65 dBAMaximum speed: 86 dBA.Most of the noise is generated by the roof fan.5.1.14 WeightsTable 5-4 Overall drive weights5.1.15 Input current, fuse and cable size ratingsThe input current is affected by the supply voltage and impedance.Typical input currentThe values of typical input current are given to aid calculations for power flow and power loss. Thevalues of typical input current are stated for a balanced supply.Maximum continuous input currentThe values of maximum continuous input current are given to aid the selection of cables and fuses.These values are stated for the worst case condition with the unusual combination of stiff supply withbad balance. The value stated for the maximum continuous input current would only be seen in oneof the input phases. The current in the other two phases would be significantly lower.The values of maximum input current are stated for a supply with a 2 % negative phase-sequenceimbalance and rated at the maximum supply fault current given in Table 5-5.Size Model kg lbDFS1 All variants 300 661DFS2 All variants 720 1587FusesThe AC supply to the drive must be installed with suitable protection against overload andshort-circuits. Table 5-5 shows the recommended fuse ratings. Failure to observe thisrequirement will cause risk of fire.WARNING