April 11, 2023
AC means AC power supply;
DC means DC power supply;
AC power supply, power wiring does not distinguish between positive and negative poles;
DC power supply, you need to pay attention to power wiring to distinguish between positive and negative poles;
Master above principles, next wiring will be simple,
Power supply interface diagrams for several common devices are as follows:
Common Interface 1
As shown in picture on left: this type of interface is a normal round power connector, and power standard will be engraved on connector.
Tips: how to tell positive and negative poles of round power port? The outer layer of connector is negative pole and inner core is the positive pole.
Common interface two
As shown in figure on right: This type of interface is a green terminal block, and font is engraved on connector, as shown in figure in kind: 24V AC power supply. The middle is a public ground port, and left and right side is a two-pole power supply interface, and wiring does not distinguish between positive and negative.
Advice. For this type of power supply terminal, you need to use a flathead screwdriver to loosen screw on terminal, insert power cord into terminal, and then tighten the screw.
Common Interface 3
As shown in left figure, device's power port is built into rear fuselage. The power supply interface is marked AC24V and DC12V, indicating that this device supports two power supply methods. When using a DC power supply, it is necessary to distinguish between positive and negative poles. As shown in figure, left interface is negative pole and right interface is the positive pole.
Regular power adapter: round tip
Common power adapter: 2-wire
How can I tell if power adapter interface cable is damaged?
As shown in figure below, after power adapter is disconnected, entire black line is negative pole, and black and white line is positive pole.
Black is negative, red is positive.
Because different power adapter models have different line definition, it is recommended to use a multimeter to measure positive and negative poles.
