BRACKET AS-LINK 4393939 - Caterpillar

Static Flashing (Stopped Engine)
Table 1
TOOLS NEEDED    
Quantity     Description    
1     6 VDC Battery    
Stop the engine.
At some convenient point between the voltage regulator and the exciter stator, disconnect the F1 exciter wire and the F2 exciter wire.Note: The designations for the (L1) terminals will vary depending on the type of AVR. The VR6 uses "F1" and "F2" terminal labels. The R448 uses "E+" and "E-" terminal labels. The R450 has "F+" and "F-" terminal labels.Refer to Illustration 1.
Illustration 1 g02352822
Connect the positive cable of the 6 V source to wire F1. Refer to the previous note about (L1) terminal connection designations.
Momentarily put the negative cable of the 6 V source on wire F2 (two or three times).Note: Do not hold the negative cable to wire F2 for more than 1 to 2 seconds.
Connect all wires that were previously disconnected.Dynamic Flashing (Running Engine)
Refer to Systems Operation Testing and Adjusting, UENR1283, "Generator Set - Test" for more information.
Illustration 2 g00614470
Dynamic Flashing Circuit (1) Battery (greater than or equal to 6 VDC) (2) Diode (3) Red test lead "+" (4) Black test lead "-"
Table 2
TOOLS NEEDED    
Quantity     Part Number     Description    
1     237-5130     Digital Multimeter    
1     8C-5444     Diode
(MR-504)    
1         Dynamic Flashing Circuit    
Construct the dynamic flashing circuit that is shown in Illustration 2.
Stop the engine.
Connect a multimeter (set on vac) to generator power bus bars or the sensing input of the voltage regulator on medium voltage generators.
Start the engine and run the engine at low idle.
Do not hold the flashing circuit's test leads on the terminals longer than necessary. This can cause the voltage to become too high. Excessive voltage can cause damage to the generator and can cause damage to the flashing circuit.
Hold the red lead of the dynamic flashing circuit to terminal F1.Note: The designations for the (L1) terminals will vary depending on the type of AVR. The VR6 uses "F1" and "F2" terminal labels. The R448 uses "E+" and "E-" terminal labels. The R450 has "F+" and "F-" terminal labels.
Monitor the voltmeter. Touch the black lead to terminal F2 of the dynamic flashing circuit. Refer to the previous note for (L1) terminal designations.
When the voltmeter shows an increase in voltage, remove the test leads from terminal F1 and terminal F2. If the generator voltage does not increase within 5 to 10 seconds, remove the test leads from terminals F1 and F2. Refer to the previous note for (L1) terminal designations.