PLATE 4V9804 - Caterpillar

Illustration 1 g02320335
(1) Rotating switch (Excitation type and time response)
(2) Rotating switch (Voltage sensing)
(3) Rotating switch (LAM and U/F)
(4) "P1" Voltage
(5) "P2" Stability
(6) "P3" Excitation
(7) Excitation limiting/overload indicator LEDs
(8) 10 Amp fuses
(9) Field and excitation supply connections
(10) Model designation
(11) "P4" (Quad droop)
(12) Droop current transformer input
(13) Remote voltage adjustment potentiometer input
The high voltage that is produced by an operating generator set can cause severe injury or death. Before performing any maintenance or repairs, ensure that the generator will not start.Place the engine control switch in the "OFF" position. Attach "DO NOT OPERATE" tags to all starting controls. Disconnect the batteries or disable the starting system. Lock out all switchgear and automatic transfer switches that are associated with the generator.
The R450 AVR may control any of the following excitation systems: AREP, PMG and SHUNT.
Excitation Type and Time Response Rotating Switch
Illustration 2 g023527880 - "AREP" excitation and normal time response1 - "PMG" excitation and normal time response2 - "PMG" excitation and fast time response. For "SHUNT" applications, "AREP" excitation must be selected.3 - "AREP" excitation and fast time response.Voltage Sensing Rotating Switch
Illustration 3 g023527890 - Voltage from 320V to 530V (5000/6000 series)1 - Voltage from 80V to 320V (5000/6000 series)2 - Voltage from 80V to 320V (7000/8000 series)3 - Voltage from 320V to 530V (7000/8000 series)LAM and U/F Rotating Switch
Illustration 4 g023527900 - Change in the voltage according to the U/F ratio. Knee point position at 48 Hz.1 - Change in the voltage according to the 2 U/F. Knee point position at 48 Hz.2 - Change in the voltage according to the self auto-adaptive LAM combined with 2 U/F. Knee point position at 48 Hz. 3 - Change in the voltage according to the U/F ratio. Knee point position at 58 Hz. 4 - Change in the voltage according to the 2 U/F. Knee point position at 58 Hz. 5 - Change in the voltage according to Change in the voltage according to the self auto-adaptive LAM combined with 2 U/F. Knee point position at 58 Hz. 6 - Change in the voltage according to the U/F ratio. Knee point position at 65 Hz.7 - Special (not used) 8 - Change in the voltage according to the U/F ratio. Knee point position at 48 Hz or 58 Hz according to the selection of the frequency by an external contact. 9 - Change in the voltage according to LAM 1. Knee point position at 48 Hz or 58 Hz according to the selection of the frequency by an external contact.Excitation Systems
"SHUNT" R 450 AVR
Illustration 5 g02173876With "SHUNT" excitation, the AVR is powered by the main winding (100V to 140V) by using "X1, X2" on the AVR. The rotating switch should be in the "SHUNT/AREP" position."AREP" R 450 AVR
Illustration 6 g02173878"AREP" Excitation System
The electronic AVR is powered by two auxiliary windings which are independent of the voltage sensing circuit.The first winding has a voltage proportional to the alternator main voltage ("SHUNT" characteristic). The second winding has a voltage proportional to the stator current (compound characteristic: Booster effect).The power