Title:
AUTOMATIC SWITCHING CIRCUIT
Document Type and Number:
Japanese Patent JPS60193002
Kind Code:
A
Abstract:
PURPOSE:To reduce the variation of the total water supply flow rate by performing a bias decreasing (increasing) operation of a machine A which is operated in an automatic mode simultaneously with a pulsing increasing (decreasing) operation of a machine B in a manual mode. CONSTITUTION:A water supply master signal FWD and the signal supplied from a flow rate oscillator 1 control the rotational frequencies of water supply pumps A and B via operators 2-6 and changeover switches 7 and 8 to control the water supply flow rate. An automatic switching circuit consisting of a differentiator 13, monitor relays 14-17, AND elements 19-22, OR elements 23-26, etc. is added to a control circuit for pumps A and B. The differentiator 13 detects the increasing/decreasing directions of the signal FWD and drives relays 14 and 15. At the same time, the differentiator 13 detects the switching timing of both pumps A and B by relays 16 and 17 and transmits a pulse signal from a pulser 18 via the AND element 19. Thus the outputs of analog memories 9-12 undergo addition and subtraction through adders 5 and 6. This increases or decreases the water supply flow rate.
Inventors:
HOZUMI MORIHARU
Application Number:
JP4706884A
Publication Date:
October 01, 1985
Filing Date:
March 14, 1984
Export Citation:
Assignee:
HITACHI LTD
HITACHI ENG CO LTD
HITACHI ENG CO LTD
International Classes:
F22D5/32; F22D5/26; G05B7/02; G05D7/06; (IPC1-7): F22D5/26; G05B7/02
Attorney, Agent or Firm:
Akio Takahashi