Management of industrial power means many things to many people. Available technology ranges from increasingly sophisticated devices that meter power consumption, monitor quality, or provide emergency backup, to full systems able to do all that plus overview usage of power for efficient production and diagnose and possibly prevent outage problems.
A recent survey of Control Engineering readers about power management indicates most respondents underestimate the extent and cost of poor quality power in their plants. Of the survey respondents, 67% place the source of problems on their utility, although industry experts say two-thirds of all power problems actually originate from within a plant.
Contestants on the show Family Feud won points and eventually prize money for correctly matching their answer to audience survey responses. The valve survey recently conducted by Control Engineering is less animated, but financial rewards for properly selecting, applying, using, and maintaining valves can be much greater than won on Family Feud.
Harwinton, Conn. —Nova AC, BBVF adjustable frequency drive is available in 1/2 or 1 hp. This PWM drive provides full torque over a 30:1 speed range and has adjustable linear acceleration and deceleration. Power input is either 115 or 230 V ac single phase. It drives standard 208-230 V ac 3-phase motors.
Fort Smith, Ark. —Series 5 open chassis micro inverter is a compact, low cost ac inverter for variable torque, constant torque, or constant horsepower applications. Series 5 is available in 1/2 and one horsepower ratings for 115 or 230 V ac output. Features include microprocessor-controlled PWM output, accel/decel rate adjustment, reversing, adjustable current limit, and adjustable slip ...
Variety in electric motors and their controls continue to add spice to the selection process for users of these products. Control Engineering's new research survey of 1,500 readers verifies the diversity of motor and drive products being applied in many industries. In the following results, 358 usable responses represent the survey's base (North America).
A remote field instrument is a device used to sense a physical parameter such as pressure or temperature. This measurement is translated to a signal current in the range of 4-20 mA which is proportional to the measured variable. The 4-20 mA standard has provided an excellent platform for the development of process instrumentation.
York, Penn. —BCX Series washdown-duty ac inverters are available in 1/6 to 5 hp, 230/460 V ac models. The units feature an integral speed potentiometer and run/stop switch. Three internal potentiometers for adjustments and a 0-5 V dc follower are offered. ACE-KL washdown-duty inverters are available in 1/2 to 5 hp, 230/460 V ac models.
Electronic motion control has become a complex combination of diverse elements—motors, drives, amplifiers, motion controllers, embedded chips, feedback devices, software tools, and more. This vast mosaic of solutions is supplied by hundreds of companies with new entrants expanding the list.
As electric utilities become deregulated or privatized, they will have a much greater need for fast and efficient access to information about their operations and how customers use their services.At the same time, deregulation will increase user awareness of the need to review and understand consumption histories, usage characteristics, and the ability to manage load curves.