Patents Examined by Anna Vazquez
  • Patent number: 9476624
    Abstract: A method including determining whether an OFF criterion is satisfied for a lag compressor of a tandem set of scroll compressors. The tandem set of scroll compressors includes a lead compressor. The method further includes: initiating at least one process when the OFF criterion is satisfied; and maintaining the lag compressor in an ON state for a predetermined period subsequent to the OFF criterion being satisfied. The at least one process includes at least one of: operating the lead compressor at a maximum level; overriding a motor overload protection method, wherein the motor overload protection method protects motors of the lead compressor and the lag compressor; and overriding a proportional integral derivative (PID) method to reduce a speed of a condenser fan. The PID method controls the speed of the condenser fan. A system including the lag compressor module and the lead compressor module.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: October 25, 2016
    Assignee: Liebert Corporation
    Inventors: Roger Noll, Lou Monnier, Gary A. Helmink, Zhiyong Lin, Daniel J. Schutte, Benedict J. Dolcich