DRIVING CONTROLLER FOR PUMP
Document Type and Number:
Japanese Patent JP3583318
PROBLEM TO BE SOLVED: To provide the driving controller of a well pump, where malfunction does not occur when power is started.
SOLUTION: Since a starting control circuit 11 operates and the smoothing capacitor C1 of a pump driving control circuit 10 is charged by the voltage of a second DC power source 12 when power is supplied or when a system is restored after a power cut, the delay of the start of the smoothing capacitor C1 smoothing rectifying output owing to shorting between the electrodes of a water level detection electrode 6 by the electric resistance of water is dissolved. Then, the malfunction of water level detecting owing to the input of reference voltage to the plus input terminal of a comparator 7 before the start of a first DC voltage DC1 is avoided at the time of starting.
August 06, 2004
July 05, 1999
F04D15/00; F04B49/00; G05D9/12; H02P23/00; (IPC1-7): G05D9/12; F04B49/00; F04D15/00; H02P7/36