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R448 Datasheet(PDF) 12 Page - Nidec Motor Corporation. |
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R448 Datasheet(HTML) 12 Page - Nidec Motor Corporation. |
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12 / 16 page  Installation and maintenance R448 & R448 V50 A.V.R. 12 3972 en - 05.2008 / e LEROY-SOMER the voltage between E+ and E- (approx. 10V D.C.). The best response times are obtained at the limit of the instability. If no stable position can be obtained, try disconnecting or replacing the ST2 jumper (normal/fast). h) Check LAM operation : ST5 closed. i) Vary the frequency (speed) around 48 or 58 Hz according to the operating frequency, and check the change in voltage from that observed previously (~ 15%). j) Readjust the speed of the unit to its rated no-load value. Adjustments in parallel operation Before any intervention on the alternator, make sure that the speed droop is identical for all engines. k) Preset for parallel operation (with C.T. connected to S1, S2) - Potentiometer P1 (quadrature droop) in centre position. Apply the rated load (cos ϕ = 0.8 inductive). The voltage should drop by 2 to 3%. If it increases, check that V and W and also S1 and S2 have not been reversed. l) The no-load voltages should be identical for all the alternators intended to run in parallel. - Couple the machines in parallel. - By adjusting the speed, try to obtain 0 KW power exchange. - By altering the voltage setting P2 on one of the machines, try to cancel (or minimise) the current circulating between the machines. - From now on, do not touch the voltage settings. m) Apply the available load (the setting is only correct if a reactive load is available) - By altering the speed, match the KW (or divide the rated power of the units proportionally) - By altering the quadrature droop potentiometer P1, match or divide the currents. 4.2.2 - Max. excitation setting (excitation ceiling) - static adjustment of the current limit , potentiometer P5 (fuse rating : 8 A - 10 seconds). The maximum factory setting corresponds to that of the excitation current required to obtain a 3-phase short-circuit current of approximately 3 IN at 50 Hz for industrial power, unless otherwise specified(*). A static method can be used to reduce this value or adapt the Isc to the actual operating power (derated machine), which is safer for the alternator and the installation. - Disconnect power supply wires X1,X2 and Z1,Z2 and the voltage reference (0-110V- 220V-380V) on the alternator. Connect the mains power supply using a transformer (200-240V) as indicated (X1,X2) : 120V). - Apply the corresponding voltage to the voltage reference input used - Supply the AVR with a voltage of 120V max. on the X1, X2 input. - Install a 10A D.C. ammeter in series with the exciter field. - Turn P5 fully anti-clockwise and activate the power supply. If there is no output current from the AVR, turn potentiometer P2 (voltage) clockwise until the ammeter indicates a stable current. - Switch the power supply off, then on again, turn P5 clockwise until the required max. current is obtained (no more than 10 A). Checking the internal protection : depending on the mains frequency Max. excitation Voltage Field ~ 10 ohms X2 Z1 X1 Z2 E+ E- 0V 110 V 220V 380V 50Hz 60Hz P2 P3 P5 ST3 10A DC 100V...140V 110/220/380V R 448 ST4 A + - A D |
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