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Step 4 checks for voltage at all possible 2-point combinations on the power conductors. Step 3 is a check to see that the correct motor has been locked out. Step 2 alerts others not to re-energize the motor. Step 1 should ensure zero energy at the motor. Although this many steps may appear to be a bit paranoid, there is actually logical justification for each one. (5) Use the same AC voltmeter to verify 480 volts between any two of the L1, L2, and 元 test points Explain the rationale behind each step in this sequence. (f) Voltage between terminals M and earth ground (e) Voltage between terminals L and earth ground
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(d) Voltage between terminals K and earth ground (4) Use an AC voltmeter to verify 0 volts between the following test points: (3) Push the “Start” pushbutton switch to check that the pump does not start up (2) Place a padlock and a danger tag on the switch’s handle to ensure it cannot turn on For this reason, and also for personal safety, the electrician must ensure no power will get to the motor during his test.īefore commencing the test, the electrician follows this procedure to ensure the motor is in a zero energy state: Like all ohmmeter tests, a “megger” check must be performed on a device that is unpowered.
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Here, the electrician will check resistance between each of the motor’s terminals (T1, T2, T3) and the metal frame of the motor, ensuring there are many millions of ohms (open) as the wire insulation should provide. “Megger” is the brand name of a high-voltage ohmmeter used to check the integrity of electrical insulation in electric motors, transformers, and other devices with wire coils subject to faults due to corrosion, vibration, or overheating. Read how the technician does Troubleshooting Pump Control Circuit? Troubleshooting Pump Control CircuitĪ lift station is an underground reservoir with an automatically-controlled electric pump that collects and transports sewage from neighborhoods to a centralized wastewater treatment plant (usually located miles away):Īn electrician needs to perform some routine “ megger” measurements on the electric pump motor. An electrician performs routine megger measurements on the electric pump motor.