2301 ELECTRIC GOVERNOR FOR GENERATOR SET AND INDUSTRIAL ENGI Caterpillar


Problem No. 7: Engine Does Not Share Load (For Load Share Units Only)

Usage:

Step 1. Manual Linkage Check

Test Procedure:

With engine stopped, manually move actuator lever and linkage to full FUEL ON position against stop screw.

Expected Results:

Linkage should move thru full travel until it is against stop screw, without binding or excessive force.

Step 2. Check For Fuel Linkage Travel Against Stop Screw

Test Procedure:

Run only one engine. Now load the engine until speed slows to 50 rpm less than Rated speed. Check fuel linkage to determine if linkage goes completely to max. fuel position. If not enough load is available to move fuel linkage to max. fuel position, look at fuel linkage during acceleration from Low Idle to Rated speed.

Expected Results:

Linkage should go to max. fuel position (if enough load is available).

Step 3. Check for Engine Speed Control and Response (at Part Load)

Test Procedure:

Run only one engine in Isochronous Mode at Part to Full Load. Disconnect any external speed control components (such as Synchronizer) from 2301 Control. Now adjust the potentiometers (on the 2301 Control panel) that follow:

* RATED SPEED
* GAIN
* STABILITY
* LOAD GAIN

NOTE: Set LOAD GAIN voltage the same as the other units are set for Full Load (usually about 4 to 6 volts). Now check engine speed control and response to load changes.

Expected Results:

Acceptable speed control with good response.

Step 4. Check CT Phasing

Test Procedure:

Connect voltmeter to Load Signal jacks on face of control panel. Run only one engine in Isochronous Mode at Part to Full Load. Now jumper across each CT input, one phase at a time.

Expected Results:

The Load Signal voltage should drop by one-third (1/3) as each phase is jumpered (shorted).

Step 5. Measure and Compare Individual Supply Voltages

Test Procedure:

Run only one engine. Measure the supply voltage to 2301 Control. Now make the same measurement with the other engine. Make a comparison between the results of the supply voltage measurements of each of the load share engines to their respective 2301 Controls.

Expected Results:

Voltage difference between 2301 Control units should not be more than 2 volts.

Step 6. Check Output for Phase Match and Speed Control (w/o Transfer Switch)

Test Procedure:

Connect any external speed control components that were removed, such as Synchronizer, back to the 2301 Control. Run only one engine at Rated speed. Now disable or disconnect the Transfer Switch and synchronize phase with main bus while external control is active. Observe the output for phase match and speed control.

Expected Results:

Phase match is correct and speed control is acceptable.

Step 7. Load Share Test

Test Procedure:

Put the Transfer Switch back into operation. If necessary, make adjustments to all settings that follow so they are the same as all other units:

* Speed
* Droop
* Load Gain
* Generator Voltage
* Voltage Droop
* Gain

Now Load Share Test with the other power sources.

Expected Results:

Engine should take and share the load.

Step 8. Synchronizer Check

Test Procedure:

Check Synchronizer for acceptable command signal during paralleling attempt to connect power to bus bars.

Expected Results:

Automatic phase match and Transfer Switch command signal are both good.

Step 9. Reverse Power Relay Check

Test Procedure:

Check the Reverse Power Relay for correct connections and for a correct setting of current level and length of time delay. If settings look acceptable, increase the settings above normal for the test that follows.

Expected Results:

Reverse Power Relay settings should be the same as the actual reverse current flow (no overlimit reverse power).

Step 10. Check Wiring and Parallel Relay

Test Procedure:

Inspect parallel lines or 2301 Control leads to see if they have acceptable EMR shielding, are properly grounded, and are not routed (positioned) close to EMR sources. Verify that the Parallel Relay is a sealed, low signal type with wiping contacts for positive connection at low current flow. Also measure the relay resistance.

Expected Results:

Parallel Relay is correct type with resistance 0.3 ohms or less. Wiring is good.

Step 11. Check Resistance Between Common Grounds

Test Procedure:

Stop the engine. Measure the resistance between common grounds of the engine, 2301 Control and the switchgear.

Expected Results:

Resistance less than 2 ohms.

Step 12. Load Share Test With External Components Removed

Test Procedure:

With engine stopped, remove Minimum Fuel circuit leads from the 2301 Control. Remove and jumper the remote Idle Switch leads and remote Speed Control leads. Check the magnetic pickup leads for correct routing (position) and for good EMR shielding. Now run the engine and make a Load Share Test with the main buses.

Expected Results:

Load Share should be acceptable.

Caterpillar Information System:

2301 ELECTRIC GOVERNOR FOR GENERATOR SET AND INDUSTRIAL ENGI Problem No. 6: Engine Overspeeds
2301 ELECTRIC GOVERNOR FOR GENERATOR SET AND INDUSTRIAL ENGI Problem No. 5: Engine Speed Not Constant
2301 ELECTRIC GOVERNOR FOR GENERATOR SET AND INDUSTRIAL ENGI Problem No. 4: Engine Will Not Decelerate. Engine Will Not Idle.
2301 ELECTRIC GOVERNOR FOR GENERATOR SET AND INDUSTRIAL ENGI Problem No. 3: Engine Will Not Carry Load (Low Power)
2301 ELECTRIC GOVERNOR FOR GENERATOR SET AND INDUSTRIAL ENGI Problem No. 2: Engine Will Not Start
2301 ELECTRIC GOVERNOR FOR GENERATOR SET AND INDUSTRIAL ENGI Problem No. 1: Fuel Linkage Has Limited Travel, Binds, Or Takes Excessive Force
2301 ELECTRIC GOVERNOR FOR GENERATOR SET AND INDUSTRIAL ENGI Problem Index
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