Nidec Leroy-Somer R450 M Installation And Maintenance Manual

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Nidec Leroy-Somer R450 M Installation And Maintenance Manual Manual pdf 14 page image

2019.03 / kElectric Power Generation14Installation and maintenanceR450M&T AVR4342 en -4-INSTALLATION-COMMISSIONING4.1 - Electrical checks on the AVR- Check that all connections have beenmade properly as shown in the attachedwiring diagram.- Check the rotating switches selections- frequency,- type of alternator,- normal position (response time),- external potentiometer,- rated voltage,- secondary current of the CT used,- type of excitation.- R450 optional operating modes4.2 - Setting upThe various adjustments during testsmust be made by a qualified engineer. Itis essential that the drive speedspecified on the nameplate is reachedbefore commencing adjustment. Afteroperational testing, replace all accesspanels or covers.The AVR is used to make anyadjustments to the machine.4.2.1 - Setting up the R450Before using the AVR, make sure thatthe rotating switches have beencorrectly configured with AREP/SHUNTor PMG excitation.a) Initial potentiometer settings (see tablebelow).Action Factory setting Pot.P1P2P3P410 Amaximum400 V - 50 HzNot set(centre position)Not set(fullyanti-clockwise)Excitation ceiling- Factory-sealedVoltage quadrature droop(// operation with C.T.)- 0 quadrature droop fullyanti-clockwiseVoltageminimum fullyanti-clockwiseStabilityStability adjustments in standaloneoperationb) Install a D.C. analogue voltmeter (needledial) cal. 100 V on terminals E+, E- and anA.C. voltmeter cal. 300 - 500 or 1000 V onthe alternator output terminals.c) Check the rotating switch selection.d) Voltage potentiometer P1 at minimum,fully anti-clockwise.e) Stability potentiometer P2 around 1/3 infrom the anti-clockwise stop.f) Start the engine and set its speed to afrequency of 48 Hz for 50 Hz, or 58 for60 Hz.g) Set the output voltage to the desiredvalue using P1:- rated voltage UN for solo operation(eg. 400 V).- or UN + 2 to 4% for parallel operation withC.T. (eg. 410 V -).If the voltage oscillates, use P2 to makeadjustments (try both directions), observingthe voltage between E+ and E- (approx.10 V D.C.). The best response time isobtained at the limit of the instability. If nostable position can be obtained, try selectingthe fast position.h) Check LAM operation: depending on therotating switch selection.WARNING