| 摘要 |
PURPOSE:To rapidly continue the operation of the apparatus to be controlled by operating all the electric power installations in the event of abnormality in a centralized control device or disconnection of control lines. CONSTITUTION:All the control contacts 31-3n of a centralized control device 2 consists of positive contacts. Loads such as lighting, elevators and refrigerating and air conditioning apparatus are controlled by way of interface relays 41-4n. The operation of the contact outputs of the case in which the device 2 is normal is so constituted that when it is on the load apparatus stop and when off the load apparatus run. The abnormal signal is so constituted that when it is on it is normal and when it is off it is abnormal. When the unit 2 is abnormal, all the apparatus are operated. |
