The low voltage you are getting at the case is probably what is known as phantom or ghost voltage, and it is observed when you would expect a reading of 0 volts. The thinking behind this is that if the wires get reversed somewhere between the entrance panel and your tool, it will be certain that the hot wire can be shut off. No, it doesn't matter how the secondary of the upstream transformer is connected. Not all meggers have this feature. Be sure to include the id number off of the motor nameplate. Keep all tools, chains, equipment, etc. Following are various stipulations pertaining to these rates.
If the difference is bigger, this could mean that some wires of the coil are short-circuited and the overall coil length is shorter. In order to do this procedure, written by Augie Hand, you will need a 6 or a 12 volt battery an Analog Voltmeter, and tape to label leads. When there is no electrical load, the same voltage should appear at both ends of the branch circuit conductors. Make sure any jumpers for voltage selection remain connected. The lead located halfway between the other two will thus be the corner lead of the delta. Preload springs are required to supply minimum downthrust to bearings at start up in order to prevent bearing skidding.
Preliminary often definitive tests generally take place using the ubiquitous multimeter. The ideal mode of testing is phase to phase and phase to ground. At one minute you need to take a megohm reading and repeat it at ten minutes. Line connections are always to T1, T2, T3, but also T4, T5, T6 for low voltage. If the motor has any of the following issues on the outside, they may be problems that can shorten the life of the motor because of previous overloading, wrong application, or both. Then find 3 leads that have continuity. The lead located halfway between the other two will thus be the corner lead of the delta.
The markings on the external leads of a motor sometimes become defaced or are removed, which makes it necessary to identify and mark them before the motor can be properly connected to the line. Steve discusses how to identify unmarked 9 lead Delta connection on a motor. With the unit plugged in there was 122 volts between the ground and the black and also between the ground and the white. They are used in vertical high thrust motors as a guide bearing for momentary upthrust. If that's not possible, test as close to the motor as possible. I finally decidd that it must be the black and white wires shorted in the power cord so I took apart the plug that had been put on the end of the cord.
Usually, if the motor has short-circuited windings, it won't take long until this specific coil it is totally destroyed. Motor spins freely by hand. Your radial arm saw diagram shows a double-pole switch. If the motor is completely unresponsive, no ac humming or false starts, take a reading at the motor terminals. On very heavy solid shaft rotors, the rotor can be lifted by placing a second jack below the motor to allow the locknut to be turned easily. Motor must be at rest and electrical controls should be locked open to prevent energizing while motor is being serviced refer to section on Safety. To determine the internal wiring configuration of the motor, the best approach is to to measure the continuity of the motor's internal coil winding through the wiring terminals accessible from the motor's terminal box.
However, as previously stated, motor failure due to condensation is not warrantable. Refer to the following diagram and table for further information. The generalized approach uses a combination of dc tests simple continuity and ac tests transformation ratios to discover which windings are related to each other winding, and their polarities. Be careful, don't shock yourself. Everybody recognizes it, and it takes less typing. The cover must be removed to access the capacitor for inspection and testing. Many families love to sail in boats during the summer.
Instead, the pairs are in cross-pattern like this: You may now wonder, why the coils are connected in cross-pattern and not vertically. Two passive admit insignificant external disturbances to the machine methods of mounting a motor are resilient mounting and rigid mounting. For additional ratings, you will need to send us a request for the diagram. Begin to check the bearings of the motor. How can I find out which wires are considered which number off of the windings? Before you actually make any bolted connections, verify the correct rotation using a rotation tester.
Directions for adjusting it two screws are usually printed inside the removable cover. In a three-phase hookup, all legs should have substantially equal voltage readings, with no dropped phase. However, if necessary, they can also be installed in the end turns. The best answer I can give is to follow the instructions supplied with the motor. Do the following with the motor disconnected.