The G150 is available in several versions covering a broad range of voltages and power ratings, with a wide variety of standard options that allow it to meet industry and site-specific needs. It is commonly found in applications that involve moving, conveying, pumping, or compressing solids, liquids, or gases. This includes variable torque applications such as pumps, fans, blowers, and compressors, as well as constant torque applications such as mixers, extruders, and mills.
TXI’s variable frequency drive system, up and running since January 2011, consists of 10 G150 VFDs. Five of the drives provide controlled flow of up to 15,000 gallons per minute of fresh water to wash the aggregate. Four drives control the flow back to the water supply. One drive is available on an as-needed basis.
“We went to the G150 VFDs because we wanted to lower our carbon footprint and energy costs,” Allen says. “We knew there would be a distinct savings we could achieve by going to a variable frequency water supply versus mechanical.”
Siemens partnership brings reliability
Allen says Siemens is a valued vendor at the facility, and the TXI relationship with Siemens dates back approximately 10 years. “We learn from our other Siemens installations and use that knowledge to improve other operations, like Mill Creek.”
Mill Creek plant manager Ken Caldwell also has a long relationship with Siemens. He says an important part of the VFD system is the reliability of the drive software package that simplifies commissioning and configuration.
“The software helped us to utilize the horsepower as needed on our freshwater and return water pumps,” Caldwell says. “Before, we used an across-the-line starter that used a lot of amps and horsepower we didn’t need. Now we can control and maintain the flow rate of the pumps.”