WATER SUPPLY DEVICE AND METHOD FOR CONTROLLING THE SAME

PROBLEM TO BE SOLVED: To provide a turbomachinery driving device using a dual inverter system and its control method for dispensing with a main controller for controlling both inverters and an external communication device for transmitting signals showing mutual driving conditions and simply performing exchange of the signals to miniaturize the device and reduce its weight, cost, and the number of parts. SOLUTION: A complete double system water supply system is constituted by earth leakage breakers (ELB1), (ELB2), the inverters (INV1), (INV2), pumps (4-1), (4-2), and electric motors (5-1), (5-2) in Fig.1 (not shown) and Fig.2 (not shown). The inverters (INV1), (INV2) are mutually connected by a signal line (S3) to exchange signals for mutual operation conditions, a failure condition, and operation request to the other system. Among a group of sensors for detecting a load condition, signal lines (S4), (S5) for transmitting flow rate signals are directly connected with each inverter and signal lines (S6). (S7) for transmitting pressure signals are connected with both inverters in common. COPYRIGHT: (C)2010,JPO&INPIT