480- VOLT: power unit
Our company currently uses 480-volt equipment on a daily basis. We have different types of 480 powered equipment mostly utilized to eliminate harmful fumes caused by diesel- and gas-powered units or saws. We also utilize this equipment to reach areas that are beyond the distance capabilities of our hydraulic diesel and gas powered or PTO driven power sources.
Most of the time we supply our own power source for our equipment using a generator, but there are times where house power is our only option. Using house power is when the contractor will install a pigtail into an electrical panel prior to our arrival. Like in the Fort Lauderdale Notable Project at Pratt and Whitney! 480-volt equipment and power sources are a must for a professional concrete cutting company. This equipment gives us the ability to complete just about any scope of work. There are many added safety concerns to be aware of while operating 480 powered saws and power sources.
All electrical boxes must be sealed and kept free of moisture; water and electricity do not mix
All plugs must fit together properly and lock. All cords must be properly insulated and free of any cuts or damage to the insulation. Electrical tape is not a fix for damaged or cuts to the cord’s insulation Cords should be inspected daily
480-volt motors are reversible, they will spin clockwise and counterclockwise depending on how they are wired. Once you have all connections inspected, check the rotation of the unit you are using. Our 480-volt powered equipment can run clockwise or counter clockwise (forward or reverse). Make sure the piece of equipment you are operating is in neutral or the flow is off. The rotation can be checked by quickly bumping the start button on, and then off. You only have to run the unit for a second, watch the arbor shaft or motor shaft, for a clockwise rotation. Most of the 480 equipment we own, operates in a clockwise rotation.
1. Most of our 480 equipment operates consistently with the proper rotation. However, when we work on projects using house power the way the competent person wires our cord into the power source may not match the wiring in our cords. This will cause improper rotation.
If the rotation of the motor is incorrect it will cause a slab saw transmission and arbor to run in the wrong direction. The saw will travel backwards when moving the handle that controls the movement in a forward position. For a power unit, if the motor is running in the wrong direction there will not be any hydraulic flow to your tool.
2. If the equipment you are using is not running in the correct rotation, it can be easily rectified. Disconnect power to the saw or unit. Open the switch box on the piece of equipment. Following the cord coming out of the switch box, you will see a white, black and red wire hooked to the switch gear.
Switch the red and black wire coming into the switch box from the cord. This will change the rotation. Be sure to switch the wires back upon completing the job. If an electrician is available onsite most of the time, he or she will gladly help you.
3.Please remember it is your responsibility to follow proper procedure by documenting all mechanical issues with a piece of equipment you turn in. Please don’t take these suggestions lightly, when you are assigned a 480-volt powered piece of equipment. Check the cords and connections and check the rotation of the equipment. This will help keep you safe from injury or damaging hydraulic spills. Please check with your supervisor or shop foreman if you have any questions regarding the proper operation or troubleshooting of any equipment that may be new to you.