Diesel Gen-set Operation Instructions
12
Figure 3-5 AS440 Wiring diagram
3) Terminal 1 and 2 are used for external connection of voltage regulator, thus they
must be short-connected if external voltage regulator is not installed;
4) Terminal La and Lb are only applicable for some special low-voltage applications;
5) When this Gen-set is connected in parallel, S1 and S2 are used for connection of
regulating current transformer and A1 and A2 are used for connection of VAr/PF
controller;
6) Stability adjustment shall be selected as per Table 3-1;
Table 3-1 Stability selection list
Serial number Power range Response speed
B-D
〈
100kW Slow
A-C
〈
100kW Fast
B-C 100-550kW
Fast
A-B
〉
550kW Fast
7) Frequency selection is as shown in Figure 3-4.
8) See Table 3-2 for roles and adjustment methods of AVR adjustment potentiometer.
Note:
Manual voltage potentiometer shall be equipped with twin-core
shielded wire connecting to alternator casing or being
grounded directly.
Output terminal
Regulating current
transformer
Stator winding
Manual voltage
potentiometer
Low voltage mode
AVR input terminal
Main stator (armature)
Main rotor (magnetic field)
Excitation stator
Excitation rotor
Rotary rectifier
