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The HMI HM-1 hydraulic mudjacking pump was the first concrete raising product engineered and manufactured by HMI, just over 40 years ago. It’s reliability and superior engineering maintains its place in the market, but has also acted as the springboard for other, more advanced models / options which offer various options of engine horsepower, hopper size, pumping pressure, and so much more.

Our largest, self-propelled, multi-functional pump. This rugged and durable pump is the top-of-the-line mudjacking unit. With the highest available pumping pressure, largest material hopper, most horsepower and versatility.

Our most popular model, the self-propelled, hydraulic mudjacking pump drives circles around the competition. Affordable and durable, the Power Pump is a great way to start-up or add to a concrete raising business.

Over the past 3 years I have had the pleasure of conducting monthly marketing seminars for small business concrete repair entrepreneurs. I begin each session by asking some questions of the group.

The revelation that these experienced small business people are spending that much for a “maybe” is interesting to behold. It is usually followed by group discussions where to a person they conclude that:

Do you communicate by E-Mail confirming your appointment for an estimate in the coming day(s) and include a photo and background of the estimator who will be visiting the site?

Over the past several years new technology products have become available which allow small business contractors to present an image and to deliver a level of service mirroring the most sophisticated national service firms. It all started with cloud based CRM (Customer Relationship Management) systems. These tools allowed mobile entrepreneurs to deploy mobile devices to manage their customer contact information in real time. However most recently, Business App developers have perfected tablet software which is nearly plug-n- play allowing contractors to easily execute on each of the recommendations inferred in my questions to the groups.

–         Offers you a tablet estimating tool which incorporates pictures and project itemization that easily prepares estimates on the spot during a prospect  site visit where you can email your customer a professionally produced estimate on the spot incorporating photos (a portable printer in your truck solves anyone’s need for paper)

–         Provides tools for emailing prospects; confirmations of appointments, follow-ups and even post job, before and after photos for their records with your invoice.

Over the past year many contractor support firms are commissioning app developers to create custom apps to make the vision above a reality. The customization simply implants arithmetic tools and fields where the service experts provide in the app design a capability for the app to calculate price by dimension of a job. As an example a flat work contractor merely measures out a slab for replacement and takes a picture with their tablet. Each contractor has preloaded their individual pricing, determined by market and circumstance. The app produces the estimate for E-mail/mail to the customer and populates all the supporting systems for record keeping and continuous contact with the prospect. A click of a button gives a contractor a map spotting all pending estimates and jobs. This technology is being applied in: concrete repair, concrete replacement, waterproofing, spray foaming and I predict it will be the standard for landscaping, painting and more.

Over recent months I became familiar with an ideal execution of this program where HMI, (www.ConcreteRaisingSystems.com) a concrete lifting and leveling manufacturer commissioned Logical Engine,  a business app software developer to create a system to maximize the efficiency of their customers. A tour of that systems and the potential can be viewed at (http://www.mudpumps.com/information-center/estimate-rocket/).

Some years ago I began a consulting assignment with a small concrete contractor asking him about his estimating process. He told me: 1) “it would take six years to train an estimator” and 2) “he could not trust anyone else to do estimates.” I told him; “I was leaving because, if that were true that he is destined to be the same size company forever!” That company is now: deploying technology in estimating, deploying a full time estimator doing 20 estimates a day, is 4x larger and that entrepreneur plays golf on the weekends vs. running around giving estimates.

Paul DelFino is a principal of the consulting firm Opportunity Inc.  For nearly 15 years, Opportunity Inc. has assisted entrepreneurs in growing their businesses, hurtling economic downturns, and with Merger and Acquisition activity.

Concrete Solution Systems  was established in 2012 and has been successfully performing a wide variety of polyurethane injection, waterproofing in consulting projects since then. Owner, Geoff Larrance has 25 years of contracting background ranging from large-scale commercial projects to residential work.

I had Concrete Solution Systems come level my slab around the back of my house after the 70 year winter last year saw it sink quite a bit. I had originally had a competitor bid on it that markets them selves all the time with flyers in the mail, on-line, etc., but it felt like shaky ground due to the high price and the sales tactic…Geoff came in 20% less expensive and his assessment was no ‘push’, but felt rather like a straight-forward assessment of what the problem was, how it could best be poly-leveled. As it was early in the season, they came out within two weeks, and got the job done in less than a day, and to my satisfaction. This method is not inexpensive but it beats mud-jacking on so many counts and as pricing goes I’m pretty well convinced Geoff is the most economical option around town. The customer service (communication, timeliness, courteousness, follow-up, etc.) was great as well, which I’ve found to be a real problem with most contractors around this town. I even called Geoff a little while ago to get some advice on something unrelated and he totally took the time to provide options, and advised me where to go get the right product and tools. I’d recommend these guys.

Everyone that lives in Portland, Oregon is familiar with the changeable weather we get here. For example; on some days in the winter it can be snowing, or raining hard, then in a day or two it’s sunny again.  This isn’t unusual for us; but we don’t see what’s happening under the ground. All of these changes can affect the soil beneath concrete walks, patios, driveways and other areas, causing them to sink over time. The result is uneven concrete slabs that can be tripping hazards, and then also allow for more rain water and melting snow to accumulate and potentially damage the slabs. Homeowners can get really frustrated with this cycle and worry that their concrete is unsalvageable. Foamjection has a terrific solution that can raise concrete and save money over replacement. Foamjection offers specialists all over the country, with several in Portland. Let’s take a look and see how the Foamjection process works.

When you call your Portland, Oregon Foamjection service you’re tapping into a national network – this concrete raising product was developed by HMI, a manufacturer of concrete lifting equipment and materials. As concrete leveling experts, we bring our solution to your home. The first thing you’ll love is that no heavy equipment will drive onto your lawn. Our specialists will use long hoses to pump our specialized foam beneath your concrete, raising it to its former level position. You can rest assured that the whole Foamjection concrete lifting process is easy and fast; you’ll get to use your space immediately. It’s as simple as drill (small holes the size of a dime), pump (foam specially made to lift concrete) and patch (plug the holes and patch with concrete).

With Foamjection you can feel good about raising your concrete using our product. Our concrete leveling foam contains no harmful chemicals, and since you are raising and not replacing your concrete, that means no slabs in the landfill. Plus our foam is made from 39-49% recycled and renewable materials. The material won’t leach anything harmful into the ground and is created specifically for lifting concrete.

GovDeals" online marketplace provides services to government, educational, and related entities for the sale of surplus assets to the public. Auction rules may vary across sellers.

Modern variable speed drives (VSDs, a.k.a. VFDs or ASDs) are very reliable devices when installed and maintained properly. However, VSDs can experience faults, alarms, and errors from time to time, just as can any complex electronic component. It is helpful to know how to deal with such issues when they occur. Over the next few columns, we’ll discuss some of the more common faults that might be seen, and how to address them efficiently and with minimal wasted effort. I will be referencing troubleshooting methods recommended by a variety of VSD manufacturers we use, although many of these approaches will be suitable, with minor modifications, for any modern VSD.

Before we begin, let’s cover some general considerations applicable to any troubleshooting process. First, the manufacturer’s manual is usually your best source for determining the problem and what to do about it. Often the manual will have a decision tree or block diagram detailing the specific steps needed to troubleshoot each fault or alarm. This can save many hours of time addressing the problem, and speaks to the wisdom of having up-to-date documentation protected and available for all of your equipment. And keep in mind that this often extends beyond the core equipment manual; a VSD over-voltage fault, for example, might require an evaluation of incoming power quality, for which an accurate one-line diagram and/or other electrical system drawing(s) will be invaluable.

Second, approach the problem in a methodical, step-wise fashion. The goal here is to not confuse the effort by making multiple changes before assessing whether or not the problem is resolved. By executing and checking off steps as you take them, you can clearly identify which step(s) corrected the problem.

Third, whenever possible let the VSD help you pinpoint the problem. Most drives have fault history tracing, which is extremely helpful in narrowing down the issue. This history is usually available via the VSD’s HMI; if the HMI isn’t functioning, the history can sometimes be accessed by connecting the drive to a PC using the drive manufacturer’s software.

With the above firmly in mind, we’ll begin looking at some drive faults and the recommended measures for addressing them. Today we’ll examine an overcurrent fault.

An overcurrent fault can occur for a wide variety of reasons. Most are related to problems with the load or connecting cabling, and/or drive parameters not properly set to accommodate the load. Overcurrent problems originating within the drive itself usually don’t happen until after recurring field problems have not been addressed. Here are some typical issues associated with this fault:

The motor load is too heavy for the drive: Drives are correctly rated based on the amperage they can carry without exceeding their temperature rating. The drive’s rated amperage must meet or exceed the motor’s full load amperage (FLA) as indicated on the motor nameplate, AND the drive’s overload capacity must be able to support the motor’s starting current under normal operating conditions. Because starting current can vary based on the load the motor is driving, most manufacturers list two amperages for a given drive – normal duty (a.k.a. standard duty or, in some cases, light duty) and heavy duty. These duty ratings are intended to reflect the torque required to support the connected loads – normal duty ratings apply to variable torque (also called quadratic) loads such as centrifugal pumps and fans, while heavy duty ratings apply to constant torque or constant horsepower loads such as compressors, positive displacement pumps, presses, drill presses, etc. An example of the difference between these two ratings for several 480V drives from the Yaskawa GA800 series is shown in Fig. 1. Note that the ratings for heavy duty are significantly lower, which simply indicates that when a drive is used for a heavy duty application it will, on average, see more current draw during load changes (startup, rapid accel/decel, etc.) and so will need more headroom to accommodate this.

The motor insulation is breaking down:This can result from age, prolonged control by a VSD, overheating, and other factors. An insulation resistance test is used to determine the quality of the motor’s insulation. A full explanation of this type of testing is beyond the scope of this article, but in general, spot reading tests can be valuable if the motor’s insulation resistance history is available, and time vs. resistance testing is better if no history of motor insulation resistance has been recorded. (See Fig. 2 for an example of time vs. resistance test results.) The key here is to have this testing done by qualified personnel; there are many variables which can influence the testing and reduce its accuracy and so must be taken into consideration.

Insulation breakdown is usually corrected by rewinding or replacing the motor. It is helpful to know why the breakdown occurred in the first place to see to it that the same cause(s) don’t reduce the “new” motor’s life as well. One such cause is due to the inherent design of insulation systems in older motors. Many older motors are not able to effectively withstand the voltage spikes seen at the motor terminals when controlled by a VSD for prolonged periods. These spikes result from the VSD’s rapid output pulses used to create the synthesized AC waveform sent to the motor. They are inherent to most modern drives and can only be reduced by using output filters. Just how much they increase voltage levels at the motor terminals is determined by the capacitance of the drive, motor leads, and motor; the length of the motor leads; the drive’s pulse rise time and switching frequency; and the presence or absence of the aforementioned output filters. Suffice to say that it is not uncommon to see voltage levels of 2 – 4 times the line (input) voltage level at the motor terminals when a VFD is used. This is why motors suitable for being controlled by a VFD are typically built to standards such as North America’s NEMA MG 1 Parts 30 & 31, which requires motor insulation systems to be built to withstand at least 3.1x the motor rated voltage (for ≤600V motors) or 2.04x the motor rated voltage (for >600V motors). In practice, it is not uncommon to see manufacturers such as GE build 460V motors with 1800V (or higher) insulation systems. Such systems were generally not available in older motors, so even those with relatively intact insulation systems may not be able to withstand drive-induced voltages for long periods.

Motor overheating is another major cause of VFD overcurrent faults. This can be the result of the over-voltage effects mentioned above, which can gradually heat up terminal end windings. It can also be the result of operating the motor in high ambient environments. Additionally, operating a self-cooled motor (e.g. a totally enclosed fan-cooled design) at low speeds continuously can cause the motor to heat up due to reduction of air across the cooling fins. This is why it is recommended to not run fan-cooled motors at less than about 60% of rated speed for extended periods, even though a drive certainly allows this. It is widely recognized that for every 10 degrees C increase in winding temperature above the motor rated ambient, motor life is reduced by 50%. While there are a lot of factors affecting the accuracy of this statement, it remains true that motor life is reduced by overheating. So what to do about motor overheating? Taking care of the easiest things first, determine the range of operating temperatures the motor is exposed to, and see what can be done to reduce the excessive ones. Then, if you find that your self-cooled motor is running too slowly, see whether your process can handle an increase in motor speed (or replace the motor with one with a lower rated speed, if that’s economically feasible). Separate blower systems for motor cooling can also be installed (see Fig. 3), and gear reduction may be another option depending on cost and space constraints. Finally, if you’ve addressed all of these issues and find the problem remains, make sure you test the motor thoroughly to determine if a rewind or replacement is needed.

Dynamic braking for rapid deceleration is too aggressive: Large, high-inertia loads such as chippers, grinders, centrifuges, and even some large diameter fans can take several minutes to completely coast to a stop if not actively braked. Drives typically use current injection – sometimes referred to as dynamic braking or flux braking – or stepped frequency changes to decrease motor stopping time. An illustration of dynamic braking for the Yaskawa A1000 drive is shown in Fig. 5. If the parameters that govern the chosen braking method aren’t set correctly, overcurrent faults can occur. A lot of this is trial and error; loads can change depending on the application, and it may take some experimenting to determine the best settings to use under the range of normal operating conditions.

While there are a number of other causes for overcurrent faults, the above make up a large percentage of them. Next time, we’ll look at overvoltage faults, their causes and means for addressing them.