Air-conditioning apparatus including an indoor unit and an outdoor unit having its compressor driven by a three-phase AC power supply
AssigneeKabushiki Kaisha Toshiba
InventorAkiyoshi Sugiyama
Life of this patent
Estimating the term…
Abstract
An air-conditioning apparatus includes a control circuit adapted to detect, from among first to third line voltages of a three-phase AC power supply, the second or third line voltage not synchronizing with a serial signal. The control circuit detects a difference between a phase angle of the detected line voltage and that of the serial signal, compares the difference with set values and determines, by that comparison, whether the three-phase AC power supply is in a positive-phase sequence or in a negative-phase sequence. The operation of a compressor is inhibited when the negative-phase sequence is determined by the control circuit.
Claims8
An air-conditioning apparatus, including an indoor unit and an outdoor unit having its compressor driven by a three-phase alternating-current power supply, comprising:
- means, provided at at least one of the units, for preparing a serial signal corresponding to to-be-transmitted information in synchronism with a first line voltage of the three-phase alternating-current power supply and for transmitting the serial signal to the other unit;
- means, provided at at least one of the units, for receiving the serial signal sent from the corresponding unit and determining the contents of the serial signal;
- means for detecting one of a second and a third line voltages of the three-phase alternating-current power supply;
- means for detecting a difference between a phase angle of the detected line voltage and that of the serial signal;
- means for comparing the detected difference with set values;
- means for determining, in accordance with the result of comparison, whether the three-phase alternating-current power supply is in a positive-phase sequence or in a negative-phase sequence;
- and
- means for inhibiting an operation of the compressor when the negative-phase sequence is determined by the determining means.
Dependencies are inferred from the claim text.