Relay Timing Characteristics

Standard circuit techniques can be used to alter relay timing characteristics. For example, a 26.5 VDC coil should not exceed 32 VDC for continuous duty. Coil voltage greatly affects relay operating speed, with higher voltages giving higher speeds. The fastest speeds can be achieved by using an over-voltage pulse that decays to normal operating potential in a few milliseconds (See Fig. 5). A simple RC network placed between the power supply and the relay will do this. To increase the de-energized time and eliminate voltage transients, a diode can be used across the coil (See Fig. 6). Energize time of a relay can be increased and very high voltage transients eliminated with an inductor/diode combination placed between the power supply and the relay (See Fig. 7).




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