Safety System and Method for Pump and Motor
First Claim
1. A method of controlling a pump driven by a motor, the motor being connected to ground, a drive connected to the motor, the method comprising:
- sensing a current between the drive, the motor, and ground;
determining whether there has been a loss of current indicating a ground fault;
simultaneously operating an electromagnetic interference filter while sensing the current and determining whether there has been a loss of current; and
removing power from the drive and the motor substantially immediately when there has been a loss of current.
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Accused Products
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.
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Citations
10 Claims
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1. A method of controlling a pump driven by a motor, the motor being connected to ground, a drive connected to the motor, the method comprising:
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sensing a current between the drive, the motor, and ground; determining whether there has been a loss of current indicating a ground fault; simultaneously operating an electromagnetic interference filter while sensing the current and determining whether there has been a loss of current; and removing power from the drive and the motor substantially immediately when there has been a loss of current. - View Dependent Claims (2, 3)
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4. 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 (5, 6, 7)
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8. 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 (9, 10)
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Specification