Crane & Hoist
There is no specific time period during which load tests must be performed once the initial installation is inspected and load tested. Some states require operators to load test hoists and cranes every four years, but, in most cases, if the hoist is not altered, repaired or modified, it can remain in service indefinitely without a load test being required.
The short answer to your question is “yes.” However, ASME B30.16 stipulates that when a system is comprised of components with different rated capacities, the rated load of the “system” shall be based on the lowest-rated individual component.
System is defined as the combination of Monorail, Hoist and Trolley in the case of a Monorail and Crane; Hoist and Trolley in the case of an Underhung Crane.
ASME B30.16-1.3.2 states that the supporting structure, including trolleys, monorail, or crane, shall be designed to withstand the loads and forces imposed by the hoist for the rated load.
According to ASME B30.11, rated load markings are not required on monorails but are recommended. Before marking the monorail, a qualified person must determine the rated load on the monorail beam. Once the monorail is marked, the rating should be legible from the ground floor. ASME’s recommendation also applies to marking the rated loads of hoists on the monorail. For more information on hoist marking guidelines, see ASME B30.16.
It mainly includes laser type, ultrasonic type, infrared type, electromagnetic type, all use the principle that light or radio wave travels, reflects and the distance can be measured. When two overhead cranes travels to pointed position, the overhead crane mechanism rings alarm bell and gives the stop command at the same time.
1) Keep Load Close to the Ground
If the crane will be left with a load attached to it, the load should always be lowered as close to the ground as possible. Keeping tension on the cable will ensure it doesn’t swing or risk coming removed when it shouldn’t. Keeping the load high up in the air, however, invites problems with an accidental drop or other related issue.
2) Never Leave the Crane Powered On
The crane should never be left without an operator with the power left on. This would allow someone to come begin using the crane without proper training or authorization. In addition, when the crane is on it will typically be using the electric motor to maintain the cranes position. When the crane is turned off, it can use the hoist brakes, which is safer and also won’t put as much stress on the machine. This will also help to minimize the amount of electricity used, which will save the facility money.
Our Crane and Hoist division has certified technicians to provide monthly, quarterly or annual inspections. We will tag all of the equipment inspected and give a written report on each piece, with a quotation for repairing or replacing any unsafe equipment.
Motor Service & Repair
The recommended minimum insulation resistance to ground when measured at, or corrected to, 40 degrees C, is the rated machine voltage potential in kilovolts +1, in megohms. Unit should be meggered 1 – 10 minutes for a polarization index value. 2.0 is considered a minimum value when you divide the 10 minute reading by the 1 minute reading. The PI value is the result of that division.
Yes, but it is usually not cost-efficient.
It is possible to change bearings in the field depending on the motor, the location of the motor, and its environment.
The cost to rewind a motor can vary greatly based on the HP, voltage, speed, and frame size. An estimate can be provided with this information but a physical evaluation of the motor will allow us to provide the most accurate repair cost.
The turn-around-time would depend on the hp of the motor, any parts needed, additional machine work, when will we get the motor and customer willingness to pay for available, and needed Overtime. We can turn around an expedited motor rewind in as fast as 3 days assuming we have the parts we need.
It would depend on the size of the fan, onsite or in shop and how far out of balance it is. Most fans can be balanced in a 2-3 hours.
Yes, we have portable meggers, surge testers, and DC absorption equipment that can be used in the field.
Automation & Electrical
Yes, our automation and controls division can evaluate what your needs are and will customize a design, fabricate the enclosures and controls and program the system to your needs. We will then provide CAD drawings for future reference.
Can you find deterioration or weakness in motor mounts & motor support structure that may be causing detrimental vibration?
Yes, Zeller Technologies has an advanced camera specifically made for motion analysis. Enabling us to record in order to analyze and find issues like this. Our certified technician can perform this service and then literally show you his findings in the consultation that would follow.
Yes, we have specific motor test equipment that will test the impedance, inductance, resistance, and phase angle, of the motor windings, performing a comparison of each to deduce if there are irregularities. This test will give us enough information in the field to know the internal health of your motor or if more extensive evaluation is necessary.
Yes, the smallest deviation from straight alignment can bring accelerated belt and sheave wear as well as premature bearing failure.
Definitely. We have experience mechanics that will be able to safely unwire and pull your motor as well as supplying a truck for transport. Then, when the repair is complete we can not only install and wire but can perform the needed alignment. Zeller can provide a turnkey service on your motor repair.
Is Zeller Technologies able to help me figure out why my machine isn’t running at top speed any longer?
Without question. Zeller has the personal to determine if the issue is electrical, electronic, or mechanical. We not only find the problems but we can provide the solutions.
I know that my motor needs the bearings changed. I’d rather not pull it and send it to your shop. Can Zeller do this work in the field?
Most often yes. Depending on the horse power and the location it is usually more economical to have a Zeller technician come on site and perform this work. With specific information, Zeller can set a date to bring the necessary equipment and replacement bearings, and in most cases be in and out in one day. We will finish the job by providing the needed alignments and send documentation of the final readings.
Repair & Routine Services
Do you evaluate condition of bearings and overall performance? How often should this be done? What is the cost?
Products & Parts
What Manufacturers Do You Service/Sell?
AC/DC Variable Speed Drive
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- New Cranes
- Hoist & Crane Repair
- Control Upgrades
- Radio Upgrades
- Load Testing
- Tests & Maintenance
- Certification Classes
- Motor repair
- Motor rewind
- Motor balancing
- Equipment diagnostics
- Pump repairs
- Fan repairs
- Gearbox repairs
- So much more
- Drive & Control Repair
- Infrared Thermography
- Energy Efficiency & Power Analysis
- Switchgear Testing & Upgrading
- Panel Shop Fabrication
- Panel Assembly Services
- PLC Programming
- System Integration
- Laser Alignment
- Predictive & Preventative Maintenance