초록 ▼

A diagnostic system includes a controller adapted for coupling to a compressor or electronic stepper regulator valve. The controller produces a variable duty cycle control signal to adjust the capacity of the compressor or valve position of the electronic stepper regulator valve as a function of dem

A diagnostic system includes a controller adapted for coupling to a compressor or electronic stepper regulator valve. The controller produces a variable duty cycle control signal to adjust the capacity of the compressor or valve position of the electronic stepper regulator valve as a function of demand for cooling. The diagnostic system further includes a diagnostic module coupled to the controller for monitoring and comparing the duty cycle with at least one predetermined fault value indicative of a system fault condition and an alert module responsive to the diagnostic module for issuing an alert signal when the duty cycle bears a predetermined relationship to the fault value.

대표청구항 ▼

1. A diagnostic system for an electronic stepper regulator valve, comprising:a controller adapted for coupling to an electronic stepper regulator valve, said controller producing a variable duty cycle control signal for adjusting a valve position of said electronic stepper regulator valve, in which

1. A diagnostic system for an electronic stepper regulator valve, comprising:a controller adapted for coupling to an electronic stepper regulator valve, said controller producing a variable duty cycle control signal for adjusting a valve position of said electronic stepper regulator valve, in which said duty cycle is a function of demand for cooling; a diagnostic module coupled to said controller for monitoring and comparing said duty cycle with at least one predetermined fault value indicative of a fault condition; and an alert module responsive to said diagnostic module for issuing an alert signal when said duty cycle bears a predetermined relationship to said fault value.