Nidec LSA 49.1 Installation And Maintenance Manual

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Nidec LSA 49.1 Installation And Maintenance Manual Manual pdf 7 page image

2017.12 / p7Electric Power GenerationInstallation and maintenanceLSA 49.1Low Voltage Alternators - 4 pole3007 en -There are 2 possible methods for restoringthe above minimum values.a) Dry out the machine for 24 hours in adrying oven at a temperature of 110 °C(without the regulator).b) Blow hot air into the air intake, havingmade sure that the machine is rotating withthe exciter field disconnected.Note : Prolonged standstillIn order to avoid these problems, werecommend the use of space heaters, aswell as turning over the machine from timeto time. Space heaters are only reallyeffective if they are working continuouslywhile the machine is stopped.Ensure that the alternator has the degreeof protection matching the definedenvironmental conditions.• Mechanical checksBefore starting the machine for the first time,check that:- all fixing bolts are tight,- the length of bolt and the tightening torqueare correct,- the cooling air is drawn in freely,- the protective grills and housing are cor-rectly in place,- the standard direction of rotation is clock-wise as seen from the drive end (phaserotation in order 1 - 2 - 3).For anti-clockwise rotation, swap 2 and 3.- the winding connection corresponds to thesite operating voltage (see section 3.3).3.3 - Terminal connection diagramsTo modify the connection, change theposition of the stator cables on the terminals.The winding code is specified on thenameplate.Any intervention on the alternatorterminals during reconnection or checksshould be performed with the machinestopped.In no case should the internalconnections in the terminal box besubjected to stresses due to cablesconnected by the user.WARNING