SHUNT excitation system:
The alternator with Shunt excitation is self-excited with an R 220 voltage regulator.The regulator monitors the exciter excitation current as a function of the alternator output voltage. Very simple in design, the alternator with shunt excitation has no sustaining short-circuit capacity.
R220 A.V.R. Characteristics
- Storage:-55°C;+85°C
- Operation:-40°C;+65°C
- Voltage regulation:± 0.5%
- Voltage supply/sensing range 85 to 139 V(50/60 Hz)
- Rapid response time (500 ms) for a transient voltage variation amplitude of ± 20%
- Voltage setting P1
- Stability setting P2
- Power supply protected by 8 A fuse, slow-blow action (tolerates 10 A for 10 s).The fuse is impregnated in the resin,therefore it can not be replaced
- Frequency:50 Hz with ST3 jumper - 60 Hz without ST3 jumper
- The size of the screwdriver tip used to adjust the potentiometer is 2.5 mm
R220 AVR option:
- Potentiometer for remote voltage adjustment, 1000 Ω / 0.5 W min: adjustment range ± 5%
- Remove the ST4 jumper

For wiring up the external potentiometer;the "earth" wires must be isolated as well as the potentiometer terminals(wires at the same voltage as the power).