ADEPT 20000-310 Channel module

Units running against an isolated bus often need droop set to a particular level, to prevent excessive off speed when load changes. Droop is usually expressed as a percentage and calculated by the following formula:To set a specified amount of droop using an isolated bus for the load: 1. Set the droop potentiometer to mid-position. (Use a 2K potentiometer, connected to terminal 14 (cw), 13 (wiper), and 15 (ccw). 2. Start the prime mover and adjust the RATED SPEED potentiometer for rated speed with no load. 3. Apply full load.* 4. Adjust the droop potentiometers to give desired speed.5 Remove the load and repeat steps 2 through 4 until engine speed returns to 60 Hz when the load is removed. Example: Operating at 60 Hz, 57 Hz at full load indicates 5% droop. *—If only 50% loading is possible, 58.5 Hz would indicate 5% droop. See Figure 3-3.

To set a specified amount of droop on an infinite bus load:

 1. With the generator not paralleled, adjust the RATED SPEED (or speed trim) potentiometer to give a speed setting above 60 Hz by the percentage of droop required. Example: Droop of 5% would require raising the speed to 63 Hz. 

2. Mark the potentiometer position and re-adjust the RATED SPEED (or speed trim) potentiometer for 60 Hz. 

3. Turn the external droop potentiometer full cw for maximum droop.

4. Synchronize the generator with the bus and close the tie-breaker. 

5. Return the RATED SPEED potentiometer to the mark made in step 2.

 6. Load the generator by turning the droop potentiometer counterclockwise until full load is achieved. 

7. Unload the generator by turning the RATED SPEED (or Speed Trim) potentiometer ccw until no load is achieved. 

8. Open the tie-breaker and repeat steps 1 though 6 until no further adjustment of the external droop is required in step 6.

Introduction

 The 2301A Speed Control monitors prime-mover speed and maintains it at the correct operating level. With the addition of a load sensor the system will share the load with other generators when two or more systems are running in parallel.

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