How to Use Milnor
®
Electrical Schematic Diagrams
PELLERIN MILNOR CORPORATION
Figure 5: Photo-eye (CP)
Symbols Legend
.
A. Example of single
assembly
B. Example of two separate
assemblies
CS=Control, Contactor/Motor Starter (Figure 6)—A relay capable of handling heavier
electrical loads, usually a motor.
Figure 6: Other Control Symbols
EB=Electric Buzzer (Figure 6)—An audible signaling device.
EC=Electric Clutch (Figure 6)—A clutch consists of a coil and a rotor. The rotor has two
separate rotating plates. These plates are free to rotate independent of each other until the coil
is energized. Once energized the two plates turn as one.
ED=Electronic Display—A visual presentation of data, such as an LCD (liquid crystal display),
LED (light emitting diode) display, or VFD (vacuum florescent display).
EF=Electric Fuse (Figure 6)—A fuse is an over-current safety device with a circuit opening
fusible member which is heated and severed by the passage of over-current through it.
EL=Electric Light (Figure 6)—Indicator lights may be either incandescent or fluorescent.
EM=Electro Magnet Solenoid—A device consisting of a core surrounded by a wire coil through
which an electric current is passed. While current is flowing, iron is attracted to the core (e.g.,
a pinch tube drain valve solenoid).
ES=Electronic Power Supply—A device that converts AC (alternating current) to filtered and
regulated DC (direct current). The input voltage to the power supply is usually 120 or 240
VAC. The output is +5, +12, and -12 VDC.
ET=Thermal Overload (Figure 7)—A safety device designed to protect a motor. A thermal
overload consists of an overload block, heaters, and an auxiliary contact. The auxiliary contact
is normally installed in a safety (three-wire) circuit that stops power to the motor contactor
coil when a motor overload occurs.
13
To Next Page
Loading...
Need help?
General
