Nidec Unidrive M600 Series Design Manual

Also see for Unidrive M600: Installation sheet User guide Mounting Installation Sheet Installation sheet

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Nidec Unidrive M600 Series Design Manual Manual pdf 117 page image

Safetyinformation Introduction ProductInformationSystemdesignMechanicalInstallationElectricalInstallationGettingstarted Optimization Parameters TechnicaldataComponentsizing Diagnostics ULInformationUnidrive M Regen Design Guide 117Issue Number: 46.2 Supply requirementsVoltage:200 V drive: 200 V to 240 V ±10%400 V drive: 380 V to 480 V ±10%575 V drive: 500 V to 575 V ±10%690 V drive: 500 V to 690 V ±10%Number of phases: 3Maximum supply imbalance: 2 % negative phase sequence (equivalent to 3% voltage imbalance between phases).Frequency range: 45 to 66 HzThe maximum supply symmetrical fault current must be limited to 100 kA (also required for UL compliance).6.2.1 Supply typesDrives rated for supply voltages up to 690 V are suitable for use with supply types with neutral or centre grounding i.e. TN-S, TN-C-S, TT.The following supplies are not permitted with Unidrive M Regen1. Corner grounded supplies (grounded Delta).2. Ungrounded supplies (IT) > 575 V.6.2.2 Other suppliesWherever other equipment shares the same low voltage supply, i.e. 400 Vac, careful consideration must be given to the likely need for both switchingfrequency and EMC filters, as explained in section 6.5.10 Switching frequency emission and section 6.5.11 Conducted and radiated RF emission onpage 132.6.2.3 Supply voltage notchingBecause of the use of input inductors and an active rectifier the drive causes no notching - but see section 6.5.10 Switching frequency emission onpage 131 for advice on switching frequency emission.6.2.4 Supply harmonicsWhen operated from a balanced sinusoidal three-phase supply, the regenerative Unidrive M generates minimal harmonic current.Imbalance between phase voltages will cause the drive to generate some harmonic current. Existing voltage harmonics on the power system willcause some harmonic current to flow from the supply into the drive.This latter effect is not an emission, but it may be difficult to distinguish between incoming and outgoing harmonic current in a site measurementunless accurate phase angle data is available for the harmonics. No general rule can be given for these effects, but the generated harmonic currentlevels will always be small compared with those caused by a conventional drive with rectifier input.6.3 Cable and fuse 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.The values 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 casecondition with the unusual combination of stiff supply with bad balance. The value stated for the maximum continuous input current would only beseen in one of 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-sequence imbalance and rated at the maximum supply faultcurrent given in Table 6-2 to Table 6-5.The nominal cable sizes given in this section are only a guide. Refer to local wiring regulations for the correct size of cables. In some cases a largercable is required to avoid excessive voltage drop.The nominal output cable sizes in this section assume that the motor maximum current matches that of the drive. Where a motor of reduced rating isused the cable rating may be chosen to match that of the motor. To ensure that the motor and cable are protected against over-load, the drive mustbe programmed with the correct motor rated current.Fuse protection is required in the following Regen systems:1. Single Regen, multiple motoring drives2. Multiple Regen, multiple motoring drives3. Unidrive M Regen brake resistor replacement4. Regen systems using a Unidrive M rectifierIf the harmonic distortion of the supply is high for extended periods then this can cause a reduction of the service life of the switchingfrequency filter capacitors. The effect of this is to reduce the capacitance value. If high levels of harmonic distortion are expected then it isrecommended that the capacitance values be checked periodically, and capacitors which have fallen outside of their tolerance range bereplaced.CAUTIONNOTENOTE