Alternator Installation and Maintenance
Operation & Maintenance Manual
22637300
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R 438 or R448 Regulator
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Short-circuit current = 3 x IN for 10 seconds
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Standard power supply; 2 auxiliary windings
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Shunt power supply; max 150V -50/60 Hz
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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)
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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%)
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Rapid or normal response time via strap ST2
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Voltage adjustment via potentiometer P2. Other voltages via step down transformer.
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Current detection: (parallel operation): C.T. 2.5VA cl1, secondary 1A (Option)
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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.
•
Potentiometer P5, Max. excitation current adjustment via P5: 4.5 to 10A
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50/60 Hz selection via strap ST3.
R438 A.V.R Options
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Current transformer
for parallel operation.
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Remote voltage adjustment potentiometer: 470 OHMS, 0.5 W min: adjustment range
+ -5% (range limited via internal voltage potentiometer P2).
•
Remove ST4 to connect the potentiometer. (A 1k potentiometer can also be used to
extend the adjustment range).
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