Blower emergency display unit

Abstract

Abstract PURPOSE: To realize an effective blower emergency alarm, by releasing the alarm holding status for a blower emergency alarm when the power supply is instantaneously interrupted due to change-over of the power supply. CONSTITUTION: An instantaneous power interruption detecting relay 4 is provided between power supply switch 3 and blower 5, while in parallel with this provision, control units 1, 2, power supply instantaneous interruption responding relays 17, 27, power supply instantaneous interruption responding relay contacts 17a, 27a, alarm suppressing relay 18, 28, alarm suppressing relay contacts 18a, 28a, and timing setting condensers 19, 29, are also provided. When the blower power supply is switched over, power supply instantaneous interruption detecting relay 4 is actuated and a current is applied to power supply instantaneous interruption responding relays 14, 27. Relay contacts 17a, 27a are consequently closed to allow a current flow through alarm suppressing relays 18, 28, duly causing those relay contacts 18a, 28a to open so as to transmit no emergency alarm. Accordingly, an effective blower emergency alarm can be realized. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Masami Itoyama
• 👤 Sadao Miyazaki

Bibliographic Details