| 摘要 |
PURPOSE:To execute easily a maintenance work, and to shorten a maintenance work time, by replacing the relays corresponding to control objects with each relay number, and displaying them alternately, when plural control objects become faulty. CONSTITUTION:In case when two cylinders become faulty, corresponding detecting normally opening contacts, for instance, K2a, K4a, K2b and K4b are turned on, and an alternate transfer controlling circuit CX turns on and off a control contact in accordance with a time chart. Accordingly, numerical data of data transferring circuits DT2, DT4 are transferred alternately to a storing circuit 1 at a constant period, and relay numbers of relays for controlling to drive the faulty cylinders, respectively are displayed alternately by a numerical value on an indicator 3. In the same way, even if a fault ocurs simultaneously in three places, four places or five places, its each faulty relay number is displayed successively and alternately. Accordingly, it can be confirmed immediately that the fault occurs simultaneously in plural places, by watching displayed plural relay numbers. |
