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Figure 11–11(a) Graphical illustration of relay hysteresis. As current is increasing, the switching occurs
when the pull-in value is reached. As current is decreasing, the switching occurs when the drop-out value is reached. (b) The essential parts of an electromagnet relay. Hysteresis is due to p g y y
the gap between the armature and the magnet core.
Timothy J. MaloneyModern Industrial Electronics, Fourth Edition
Upper Saddle River, New Jersey 07458All rights reserved
Figure 1–4(a) Physical layout of a conveyor/classifying system. (b) Top view of the diverting zone, showing the positions of the four diverting gates and the four chute limit switches.
Timothy J. MaloneyModern Industrial Electronics, Fourth Edition
Upper Saddle River, New Jersey 07458All rights reserved
Figure 1–6(a) The AND logic function performed by relay circuitry and by solid-state circuitry. (b) The OR function performed by relay circuitry and by solid-state circuitry.
Timothy J. MaloneyModern Industrial Electronics, Fourth Edition
Upper Saddle River, New Jersey 07458All rights reserved
Figure 1–14(a) Output amplifier using a power transistor to control the current through the output device. (b) Output amplifier using a relay contact to control the current through the output device.
Timothy J. MaloneyModern Industrial Electronics, Fourth Edition
Upper Saddle River, New Jersey 07458All rights reserved
Figure 1–14(a) Output amplifier using a power transistor to control the current through the output device. (b) Output amplifier using a relay contact to control the current through the output device.
Timothy J. MaloneyModern Industrial Electronics, Fourth Edition
Upper Saddle River, New Jersey 07458All rights reserved
Figure 2–20(a) Physical layout of a wagon being filled from a hopper. (b) Simple relay control circuit, illustrating the use of a time-delay contact to allow the powder to drain out of the supply tube into the wagon before the wagon is moved.
Timothy J. MaloneyModern Industrial Electronics, Fourth Edition