Nidec Digitax HD M75 Series Installation And Technical Manual

Contents

Nidec Digitax HD M75 Series Installation And Technical Manual Manual pdf 50 page image

Safety information Product information Mechanical installation Electrical installation Multi axis system design Technical data50 Digitax HD M75X Series Installation and Technical GuideIssue Number: 54.2 AC Supply requirementsAC supply voltage:200 V drive: 200 V to 240 V ±10 %400 V drive: 380 V to 480 V ±10 %Number of phases: 1/3Maximum supply imbalance: 2 % negative phase sequence (equivalent to 3 % voltage imbalance between phases).Frequency range: 45 to 66 HzTable 4-2 Supply fault current used to calculate maximum input currents4.2.1 Supply typesDrives are suitable for use on the following supply types:Table 4-3 AC supply configuration suitability* 400 V corner grounded delta not supportedDrives are suitable for use on supplies of installation category III and lower, according to IEC 60664-1. This means they may be connectedpermanently to the supply at its origin in a building, but for outdoor installation additional over-voltage suppression (transient voltage surgesuppression) must be provided to reduce category IV to category III.A ground fault in the supply has no effect in any case. If the motor must continue to run with a ground fault in its own circuit then an input isolatingtransformer must be provided and if an EMC filter is required it must be located in the primary circuit.Unusual hazards can occur on ungrounded supplies with more than one source, for example on ships. Contact the supplier of the drive for moreinformation.4.2.2 Line reactorsInput line reactors reduce the risk of damage to the drive resulting from poor phase balance or severe disturbances on the supply network.Where line reactors are to be used, reactance values of approximately 2 % are recommended. Higher values may be used if necessary, but mayresult in a loss of drive output (reduced torque at high speed) because of the voltage drop.For all drive ratings, 2 % line reactors permit drives to be used with a supply imbalance of up to 3.5 % negative phase sequence (equivalent to 5 %voltage imbalance between phases).Severe disturbances may be caused by the following factors, for example:• Power factor correction equipment connected close to the drive.• Large DC drives having no or inadequate line reactors connected to the supply.• Direct-on-line started motor(s) connected to the supply such that when any of these motors are started, the voltage dip exceeds 20 %.Such disturbances may cause excessive peak currents to flow in the input power circuit of the drive. This may cause nuisance tripping, or in extremecases, failure of the drive.Drives of low power rating may also be susceptible to disturbance when connected to supplies with a high rated capacity.When required, each drive must have its own reactor(s). Three individual reactors or a single three-phase reactor should be used.Reactor current ratingsContinuous current:Not less than the continuous input current rating of the driveRepetitive peak current:Not less than three times the continuous input current rating of the driveModel Symmetrical fault level (kA)All 100 kAAC supply configuration Supply type 230 V 400 VStar (Y) connected supplyAny TN, TT or neutral grounded Permitted PermittedIT (floating supply) Permitted PermittedCorner grounded Not permitted Not permittedCorner grounded in regen mode Not permitted Not permittedDelta connected supplyAny TN, TT or neutral grounded Permitted Not permitted*IT (floating supply) Permitted Not permittedCentre of one side of delta grounded Not permitted Not permittedCorner grounded in regen mode Not permitted Not permittedOperation with IT (ungrounded) supplies:Special attention is required when using internal or external EMC filters with ungrounded supplies, because in the event of a ground (earth)fault in the motor circuit the drive may not trip and the filter could be over-stressed. In this case, either the filter must not be used (removed)or additional independent motor ground fault protection must be provided. Refer to Table 4-3. For instructions on removal, refer tosection 4.10.3 Internal EMC filter on page 65. For details of ground fault protection contact the supplier of the drive.WARNING