Doosan G10WMI-2D-T2, Installation, Operation & Maintenance Manual

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Alternator Installation and Maintenance Operation & Maintenance Manual
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R438 Adjustments (AREP System)
a) Initial potentiometer settings (see table on following page).
-remote voltage adjustment potentiometer: centre (ST4 strap removed)
b) Install a D.C. analogue voltmeter (needle dial) cal. 50V on terminals E+, E- and an A.C.
voltmeter cal. 300 - 500 or 1000V on the alternator output terminals.
c) Make sure that the ST3 strap is positioned on the desired frequency (50 or 60 Hz).
d) Voltage potentiometer P2 at minimum, fully to anti-clockwise (CCW).
e) Turn the V/Hz potentiometer P4, fully to clockwise (if equipped with P4).
f) Stability potentiometer P3 approximately 1/3 of travel anti-clockwise (CCW).
g) Start the engine and set its speed to a frequency of 48 Hz for 50 Hz, or 58 for 60 Hz.
h) Adjust the output voltage to the desired value using P2.
-rated voltage UN for solo operation (eg. 400 V)
-or UN + 2 to 4% for parallel operation with C.T. (eg. 410V -)
If the voltage oscillates, use P3 to make adjustments (try both directions) observing 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
strap (normal/rapid).
i) Check LAM operation: ST5 closed
j) If AVR has P4, turn potentiometer P4 slowly anti-clockwise until there is a significant voltage
drop (approx. 15 %).
k) Vary the frequency (speed) of both parts between 48 or 58 Hz according to the operating
frequency, and check the change in voltage previously observed ( -15%).