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• R180 AVR Automatic Voltage Regulator 1 INTRODUCTION The R180 is a fully solid-state automated voltage regulator (AVR) which is used for excitation of a brushless alternator powered via a Permanent-Magnet (PMG) exciter or by means of auxiliary windings It takes a 1 and 5A signal from a droop recent transformer in U part to provide a voltage slump which permits the alternator to function in parallel The R180 has an adjunct input, which are used as a distant potentiometer terminal when related to a 1 KΩ potentiometer or takes ± 4 DC in order to exchange the terminal voltage It has an under frequency voltage roll-off operate to prevent alternator overfluxing within the occasion of underspeed operation The AVR has a potentiometer for setting the knee-point for under frequency roll-off and a 50Hz/60Hz selection jumper This jumper makes it easy to pick the AVR frequency for a 50Hz/60Hz alternator 2 TECHNICAL SPECIFICATIONS 1 Sensing input 3-ph/2-ph - 220/230/240/380/400/415 volts for fifty Hz 3-ph/2-ph - 208/240/277/380/416/440/480 volts for 60 Hz 2 Voltage range excessive 300V to 530V three Voltage range low 180V to 310V four Droop 1 and 5A AC in U section five Droop range 8% hunch at zero PF 6 AC delivery Voltage 277 VAC rms ± 10% Frequency 50/60 Hz - PMG 240 Hz 7 Excitation current 6A DC continual 9A for 5 seconds (short-circuit operation) 8 Regulation ± 0% at AVR sensing terminals 9 Maximum excitation restrict 6A DC (factory setting) 10 Maximum excitation limit delay 30 sec (factory setting) 11 Under frequency defense forty eight Hz/58 Hz for fifty Hz/60 Hz operation 12 Slope 1 (120%) V/Hz thirteen Remote potentiometer 1k Ohm for ± 10% adjustment 14 Accessory Input ± 4 DC for ±15% 15 Loss of sensing Shuts down after 5 sec when sensing open

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