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).