ENGINE AR-PRIMARY 2722837 - Caterpillar

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Before starting the phasing check, be sure the connections for the phases are connected properly.
Note: The potential connections for phases A, B and C should correspond to control terminals 1, 2 and 3.
Label all wires which are connected to terminals T4 through T9.
Connect a DC voltmeter to the load signal terminals T22 and T23 on the load sharing module. T22 is a positive terminal. T23 is a negative terminal.
Start the engine and fully load the generator set with a unity power factor load. Do NOT parallel the generator.Note: Full load is not required if complete load is not available. However, a steady load level is necessary.
Record the load signal voltage.This voltage is proportional to a percent of full load. For example, if 50 percent load is 3 DCV, then 100 percent load will be 6 DCV. See Testing And Adjusting, "Load Gain - Adjust" for this proportional adjustment.Note: The load sharing module contains internal current transformers. Due to the low impedance of the current transformers, shorting the terminals (T4 to T5, T6 to T7, T8 to T9) is not effective. The current input must be removed from the load sharing module and shorted externally.
Never disconnect current transformers from the Generator Set Load Sensor when the engine is running. The current transformers can develop very high voltages when open circuited with the unit loaded. This can result in serious injury or death to personnel.
Note: Terminals 4 through 9 of the load sharing module are the input terminals from the current transformers.
Unload the engine. Stop the engine. Disconnect the lead from T5. Connect both leads from phase "A" CT to T4.
Start the engine. Apply the same load as described in 3. Record the load signal voltage.Compare this voltage reading to the reading in 4.
If the voltage in 4 dropped by 1/3, Phase "A" is correct. Go to 7.
If the voltage in 4 did NOT drop by 1/3, Phase "A" is not correct.