When connected, one pair of relays connects one subscriber to an output and reverses the polarity of the supply to allow conversation to take place. Any other subscriber calling during this period is connected with an engaged signal generator.WERNICKE,HORST,ING....
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Current U.S. Class:Instant Of, Or Passage Or Predetermined Time Or Having Time-delay Means (318/285);With Running-speed Control (318/257);Automatic And/or With Time-delay Means (318/283);Reversing Polarity Of Current Supplied To Armature Circuit (318/293);Radiant Energy (318/480) ...
One or more relays having electrical contacts can be integrated with the motor assembly. The motor changes its direction of rotation when its polarity is switched by relay(s). Additionally, a controller can communicate with the relay(s) and the motor assembly, such that the controller permits ...
A polarity switch for switching Turnouts running direction, using bistable relays are unique with only one coil (R1, L2; R2, L1) as the predetermined Turnouts machine running direction different location relay. 为使道岔转辙机换向,将对配合的位置继电器的电流方向换向. To make Turnouts machine ...
The armature of a separately-excited motor 4 is, energized from a polarity-reversing unit 9. This unit may comprise, for example, two grid-controlled half-wave rectifier valves arranged for independent operation and having a common load circuit. Alternating potentials of opposite phase are applied...
Polarity reversal of the two line wires is done by two contacts of two different relays, of which two contacts of one relay connect the wires to two terminals with a certain polarity, and the two contacts of the other relay connect them to terminals with opposite polarity. In order to ...