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 drive, the method comprising:
- connecting the drive to a previously-installed motor in order to retrofit the motor;
determining whether the motor is a two-wire, single-phase motor or a three-wire, single-phase motor;
connecting the drive to the three-wire, single-phase motor; 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.
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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.
25 Citations
7 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 drive, the method comprising:
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connecting the drive to a previously-installed motor in order to retrofit the motor; determining whether the motor is a two-wire, single-phase motor or a three-wire, single-phase motor; connecting the drive to the three-wire, single-phase motor; 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. - View Dependent Claims (2, 3, 4)
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5. A method of installing a drive for a motor that drives a pump, the pump in communication with a fluid system, the drive including a control pad, the drive being connected to the motor by an installer, the method comprising:
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entering a service factor current value using the control pad; selecting one of a two-wire, single-phase motor;
a three-wire, single-phase motor; and
a three-phase motor,entering a current time using the control pad; entering a current date using the control pad; and engaging one of a pump-out button and an automatic start button on the control pad. - View Dependent Claims (6, 7)
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Specification