Cummins Generator Set System Configuration and Commissioning

To fully utilize a Cummins generator set, a basic understanding of its supporting systems is essential. Below is an overview of the components and commissioning procedures for Cummins generator setsystems:

1. Parallel Operation System

Conditions for Parallel Operation: Consistent voltage, frequency, and phase sequence.

Parallel Cabinet Commissioning

2. Pre-Parallel Preparation:

Connect the generator to the parallel cabinet’s output cables; verify phase sequence consistency.

Install control lines from the generator to the parallel cabinet; check proper grounding of the generator. All generator sets must have independent grounding, interconnected as a system.

Install the generator’s parallel current transformer (CT). For Marathon alternators, install the CT on the T2 phase (use the unit’s CT).

Set initial parameters for:

AVR voltage drop compensation

Load sharing controller

Speed governor (set speed and voltage adjustment potentiometers to mid-position).

3. No-Load Commissioning:

Start the generator set: Adjust frequency to 50Hz/60Hz and voltage to 390VAC/380VAC.

For GAC18M672 controllers, adjust the voltage between terminals 15-23 to 5.02VDC.

Verify phase sequence consistency across all units.

After completing the above:

Manually connect the first unit to the grid.

Select the standby unit via the synchronization switch, activate the synchroscope, and set the standby unit’s manual/automatic switch to "Automatic." The generator will automatically synchronize and connect to the grid.

4. Load Commissioning:

Apply 30-50% load to each unit individually; adjust voltages to be consistent under the same load. If adjusting voltage drop compensation alters no-load voltage, re-calibrate no-load voltage and repeat load testing until both no-load and load voltages meet requirements.

Note: Voltage regulators have varying load curves; adjustments should typically target the customer’s commonly used load range.

Parallel the units under load; check power and current matching. If power distribution is uneven, adjust the load sharing potentiometer on the controller to balance power output. Gradually increase load and rebalance as needed.

Guangxi Dingbo Power Equipment Manufacturing Co.,Ltd was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. The company has a registered capital of 218.88 million yuan. The company covers an area of 86,000 square meters and a building area of 55,000 square meters. There are more than 660 employees, including 456 professional technicians and 106 senior technicians. It has 46 sales and service outlets nationwide. The main products are diesel engines, generator sets, and diesel generators, providing users with a one-stop service of design, supply, debugging and maintenance at any time. Dingbo has always insisted on using first-class talents, building first-class enterprises, manufacturing first-class products, creating first-class services, and making every effort to build a first-class domestic enterprise. If any question please feel free to visit our website https://www.dieselgeneratortech.com/ or send email to [email protected].