Title:
CONTROL APPARATUS AND PUMP DEVICE
Document Type and Number:
Japanese Patent JP2023008488
Kind Code:
A
Abstract:
To continue an operation at a time of an instantaneous power failure shorter than a time when a count of a timer is reset.SOLUTION: A control apparatus for controlling a star-delta circuit of a dynamo-electric motor, comprises: a first terminal B1; a second terminal B2; an instance contact point J219; a timer T219 for counting a time; a switch S219 for switching a conduct of a star connection contact and a conduct of a delta connection contact of the star-delta circuit; coils C206 and C242; and a self-holding circuit 151. A count clear time as a blackout required for resetting the timer T219 is longer than a time required for switching the instance contact point J219 at a blackout from the conduct to a non-conduct. If there is a blackout shorter than the count clear time during an operation of the star-delta circuit in the delta connection, a contact L252 of the self-holding circuit 151 is turned on by turning on the instance contact point J219 when a power is supplied to the timer T219 after the blackout, and the delta connection contact is conducted.SELECTED DRAWING: Figure 8
Inventors:
KOBAYASHI KAZUKI
TANAKA MAKOTO
TANAKA MAKOTO
Application Number:
JP2021112099A
Publication Date:
January 19, 2023
Filing Date:
July 06, 2021
Export Citation:
Assignee:
EBARA CORP
International Classes:
H02P25/18; F04D15/00; H02P29/028
Attorney, Agent or Firm:
Seiji Ohno
Hideki Kobayashi
Hiroyuki Ohno
Morita Koji
Rika Fukami
Tomohiro Matsuno
Seiichi Sakatani
Hiroshi Nomoto
Hideki Kobayashi
Hiroyuki Ohno
Morita Koji
Rika Fukami
Tomohiro Matsuno
Seiichi Sakatani
Hiroshi Nomoto