Safety system and method for pump and motor
First Claim
1. A method of controlling, a pump driven by a motor, the pump and the motor installed in a well, the motor connected to a variable frequency drive, the method comprising:
- connecting the variable frequency drive to a previously-installed motor in order to retrofit the motor;
selecting, via a control pad, a motor connection type for the previously-installed motor wherein the selecting of the motor connection type includes selecting a motor connection type from a plurality of different motor connection types including a two-wire, single phase motor or a three-wire, single phase motor;
automatically setting a minimum frequency and a maximum frequency output from the variable frequency drive to the motor based on the motor connection type selected via the control pad; and
generating with the drive a first waveform and a second waveform, the second waveform having a phase angle of about 90 degrees offset from the first waveform in order to control the three-wire, single-phase motor, where the motor is indicated to be the three-wire, single phase motor.
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Abstract
Embodiments of the invention provide a variable frequency drive system and a method of controlling a pump driven by a motor with the pump in fluid communication with a fluid system. The drive system and method can provide one or more of the following: a sleep mode, pipe break detection, a line fill mode, an automatic start mode, dry run protection, an electromagnetic interference filter compatible with a ground fault circuit interrupter, two-wire and three-wire and three-phase motor compatibility, a simple start-up process, automatic password protection, a pump out mode, digital input/output terminals, and removable input and output power terminal blocks.
667 Citations
6 Claims
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1. A method of controlling, a pump driven by a motor, the pump and the motor installed in a well, the motor connected to a variable frequency drive, the method comprising:
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connecting the variable frequency drive to a previously-installed motor in order to retrofit the motor; selecting, via a control pad, a motor connection type for the previously-installed motor wherein the selecting of the motor connection type includes selecting a motor connection type from a plurality of different motor connection types including a two-wire, single phase motor or a three-wire, single phase motor; automatically setting a minimum frequency and a maximum frequency output from the variable frequency drive to the motor based on the motor connection type selected via the control pad; and generating with the drive a first waveform and a second waveform, the second waveform having a phase angle of about 90 degrees offset from the first waveform in order to control the three-wire, single-phase motor, where the motor is indicated to be the three-wire, single phase motor. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification