The system controls the motor starter coil M, and uses a spare contact on the starter, M, to seal in the motor starter. A schematic, or schematic diagram, electrical wiring is a representation of the elements of a system. View online Dimensional drawing for AMX AXU-SPPlus Control Panel or simply click Download button to examine the AMX AXU-SPPlus guidelines offline on your desktop or laptop computer. Stop push button is normally closed, so that if a wire or connection fails the system halts safely. 132kV Line Control Panel Schematics / Drawings.Start push button is normally open, so that if something fails the motor cannot be started.The lower voltage is then used to supply power to the left and right rails of the ladder below. Power is supplied by connecting a step down transformer to the control electronics by connecting to phases L2 and 元. The output of the motor starter goes to a three phase AC motor. The contacts, M, will be controlled by the coil, M. Next, all three phases are supplied to a motor starter that contains three contacts, M, and three thermal overload relays (breakers). The three phases are then connected to a power interrupter. This system uses 3 phase AC power (L1, L2 and 元) connected to the terminals. Note that symbols are discussed in detail later).ĭashed lines indicate a single purchased component. It is also common for a control cabinet to supply a higher voltage to other equipment, such as motors.Īn example of a wiring diagram for a motor controller is shown in Figure 1. 110Vac is common in North America, and 220 V AC Is common in Europe and the Commonwealth countries. This power must be dropped down to a lower voltage level for the controls and DC power supplies.

Control cabinets are often supplied with single phase AC at 220/440/550V, or two phase AC at 220/440V AC, or three phase AC at 330/550V. A control system of a PLC panel will normally use AC and DC power at different voltage levels.

Control panel drawings