JayBaima

Recent posts have dealt in detail with variable speed drives and their application, but there is another method of motor control capable of providing electrical and mechanical benefits at a lower capital cost – the reduced voltage starter. The three most common types of reduced voltage starter are:

• Wye/delta: this starter consists of three contactors – main (for isolation); wye (lower voltage for start); and delta (higher voltage for run) – which provides for initial starting of the motor via a wye (“star”) connection, then a timed transition to a “delta” connection to produce motor full-rated speed. The wye connection provides for 58% of line voltage (V-line/1.73) across each winding, and since current varies as the square of the voltage and torque is proportional to current, current and torque are reduced to 33% during starting. A simple schematic is below:

• Auto-transformer: in this method, an autotransformer supplies the motor via adjustable tap settings (typically 50%, 65%, and 80% of line voltage). This results in reduction in current at the motor terminals by the […]

By their nature, motors generate noise during operation. Because of differences in design and fabrication, even motors of equivalent frame size and horsepower may operate at different noise levels. The amount of noise produced can be affected in a number of ways when the motor is controlled by a Variable Frequency Drive (VFD). For instance, operating the motor at a lower speed will usually reduce noise level, all other factors being equal. Also, owing to a given motor’s design/construction, there may be frequencies, termed resonant frequencies, at which increased vibration and noise are created. Finally, the VFD’s switching frequency affects the amount and quality of harmonic current the drive produces; this current can create additional motor vibration and result in increased acoustic noise. Let’s look at these circumstances in more detail and discuss what can be done to address the noise produced.

Operating the motor at reduced speed is basically self-explanatory; cooling air speed and friction are reduced, resulting in less noise created. That said, a given motor may experience increased vibration at characteristic frequencies, which can increase noise to a level greater than that produced at base (i.e. rated) speed. […]

Last week we discussed some of the potential impacts of temperature and humidity on the operation and longevity of variable speed drives (VSD) and other motor control equipment. Providing the proper enclosure for the equipment is critical in ensuring you get the most from your investment. Let’s examine the various environmental conditions under which these electronic components might be installed and some methods for protecting against their deleterious effects.

At Joliet Technologies, we are frequently requested to assemble control cabinets for installation in diverse industrial and/or outdoor locations. We have also built panel assemblies for the off-shore oil industry, where the marine environment places extreme demands on the equipment. In designing these assemblies, we pay particular attention to the following:

Ambient temperature: as noted last week, drives and other control components are designed for operation within a temperature range. Typically, it is the upper end of that range, most often 40°C, that is of concern. Operating in an environment above that range places greater stresses on switching devices, potentially decreasing their operating life. If the ambient temperature surrounding the enclosure is sufficiently cooler than the drive enclosure, then either passive conduction or […]

One factor that if over-looked can cause significant equipment issues is proper environmental protection of variable speed drives (VSD’s) and other electronic equipment. We are often requested to install VSD’s and other control components in custom enclosures which will be installed under a wide variety of ambient conditions, including high temperature and/or high humidity environments. The drive electronics are rated for operation within given temperature and humidity ranges in order to ensure longevity and proper current output, so there are real risks and cost impacts associated with ignoring environmental constraints.

Temperature:

Although there is some variability from manufacturer to manufacturer, VSD’s are generally de-rated – that is, their rated amperage output is reduced – for operation between 40°C and 50°C. F0r instance, ABB specifies that output current is to be reduced by 1% for each 1°C above 40°, and the units are not rated at all for operation above 50°. This is to accommodate the rise in resistance under higher temperatures and to protect sensitive electronics from being over-stressed. Sometimes the 50°C maximum rating will be shown in manufacturers’ information as intended for “heavy duty” or “overload” use. This should not be […]

Variable frequency drives (VFD’s) can provide significant energy savings and increases overall process/system efficiency by effectively matching the power applied to the level the process requires. By controlling motor speed, changes in load demands can be adjusted for quickly and automatically to maintain optimum process conditions. Also, the energy the driving motor needs to begin rotating, manifested as a high amperage commonly referred to as “in-rush” current, can be slowly increased to ramp up the motor while minimizing current draw. The VFD shares this soft-start functionality with the reduced voltage starter, often referred to as a soft-starter, but goes beyond this by allowing adjustable speed control. Let’s examine these two characteristics of the VFD – speed control and controlled starting and stopping – to understand how energy savings and other cost benefits are achieved.

VFD controls motor speed by comparing a reference signal to a pre-set value. The reference signal can be generated externally, for example via a process setpoint, or internally by the VFD using software to model motor parameters. The latter is accomplished by most VFD’s through the auto-tuning process during initial drive setup. It then adjusts the frequency and voltage to match the reference signal, which in […]

Last week in Part II, we discussed several electrical line-side issues which should be factored in when selecting a drive. Life would be too easy if this were the whole story. There are several critical load-side (i.e. from the drive output to the motor) concerns which should be examined carefully because they can impact equipment life and your prime mover’s ability to perform the work necessary for the process.

Load Side Considerations:

• Motor amperage: Drives are properly sized by amperage, not horsepower. In order to ensure proper output capacity, the driven motor nameplate full load amperage (FLA) should be known. It is important to note that sizing the drive based on FLA is not merely being conservative. Under the working assumption that the motor is sized correctly for the load torque needed, sizing a drive for only what the motor draws under “normal” (i.e. non-peak) load conditions may not provide sufficient torque to drive the process under heavy load conditions. Also, sizing a drive by horsepower alone ignores the amount of overload the drive can provide. For example, a 460-volt drive suited for a 75hp motor under variable torque conditions may be […]

As we discussed last week in Part I, defining your application and its specific characteristics is critical to ensuring a cost-effective and successful drive installation. In addition to the mechanical considerations we discussed in Part I, there are several electrical line and load-side issues which should be factored in when deciding on the right drive (or no drive) for your process. Because there are many factors involved we will cover supply side issues for AC drives this week, and load side next week. Future posts will discuss DC drive applications in detail.

Line (Supply) Side Considerations:

• Voltage: Modern variable frequency drives (for AC motor applications) are rated to accept a nominal voltage with a typical +10/-10% tolerance. Outside of this range, the drives will usually trip out to protect themselves. In the case of an over-voltage condition, the risk is to the DC bus, which typically runs at about 1.2x the incoming voltage level. Once that level exceeds about 1.4x of the upper end of the incoming voltage range, the drive will trip out on OV. (Note that unlike AC drives,  due to the nature of their output electronics DC drives up […]

Variable speed drives (VSD’s) are considered state-of-the-art in controlling driven processes, but it is important to realize they may not be the answer to every process control problem. End users need to understand their application requirements and mechanical and electrical system constraints in order to ensure that a VSD is the right solution, and to specify it correctly. In the first part of this series, we’ll summarize some of the main process and load characteristics which should be taken into account before specifying a VSD:

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Process Factors:

• The need for speed (…control, that is)

Many processes can benefit from the ability to periodically or continuously reduce output by reducing the speed of driven equipment. For example, piping systems are often “over-designed” to accommodate future expansion or simply provide some operating headroom. If driving the motor at full speed results in output that must be “turned down”, via control valves for instance, there is a potential to increase overall system efficiency and reduce energy consumption using a VSD. Bearing in mind that capital costs tend to be higher for VSD use, it is important […]