Alternator Installation and Maintenance
Operation & Maintenance Manual
22637300
95
AREP Field Excitation System
With AREP excitation, the R438/448 electronic
AVR is powered by two auxiliary windings which
are independent of the voltage sensing circuit. The
first winding has a voltage in proportion to that of
the alternator (shunt characteristic), the second has
a voltage in proportion to the stator current
(compound characteristic: booster effect). The
power supply voltage is rectified and filtered before
being used by the AVR monitoring transistor. This
principle ensures that regulation is not affected by
distortions generated by the load.
R 438/448 LS Regulator
•
Short-circuit current = 3 x IN for 10 seconds
•
Standard power supply; 2 auxiliary windings
•
Shunt power supply; max 150V -50/60 Hz
•
Rated overload current: 8A-10S (R448: 10A - 10S)
•
Electronic protection (overload, short-circuit opening on voltage detection): excitation
ceiling current for 10 seconds then return to approx. 1A
The alternator must be stopped (or the power switched off) in order to reset the
protection.
•
Fuse F1 on input side (X1, X2)
•
Voltage detection: 5 VA isolated via transformer. 0-110V terminals = 95 to 140V, 0-
220V terminals = 170 to 260V, 0-380V terminals = 340 to 520V
•
Voltage regulation ± 1% (R448: ± 0.5%)
•
Rapid or normal response time via strap ST2
•
Voltage adjustment via potentiometer P2. Other voltages via step down transformer.
•
Current detection: (parallel operation): C.T. 2.5VA cl1, secondary 1A (Option)
•
Quadrature droop adjustment via potentiometer P1
•
Underspeed protection (U/f) and LAM. Frequency threshold adjustable via
potentiometer P4 on older models. Strap ST5 is connected for LAM operation, 25%
or 13% voltage drop via strap ST10.
•
Max. excitation current adjustment via P5: 4.5 to 10A
•
50/60 Hz selection via strap ST3.
Содержание G10WMI-2D-T2
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