shown at the side of the diagram bridge contacts 1, so short circuiting these relays and causing them to release. Since then A/2 releases before fi/1, az closes before 6t opens and an impulse is transferred to totalizer T. Since the impulsing contact P ... can be one which opens the circuit of each pair of relays at each station in turn by means of a series of motor-driven cam contacts. ... Also the time of bridging the shorting contacts must be long enough to enable the relay B/l to release.
|Title||:||Relays for Electronic and Industrial Control|
|Author||:||Ronald Claude Walker|