In the installation and maintenance of explosion-proof motors, there are many scenarios that require wiring, especially when extending connection cables. Often, due to non-standard operations by some technicians, there are numerous instances of burnt power cables, motherboard components, fuses, and communication failures. Today, I’d like to share a series of standard operating procedures and precautions for wiring, detailed as follows:
Star Connection Method
The star connection method involves connecting the three ends of the motor’s three-phase coil together as a common end, and drawing out three live wires from the three starting points. The schematic diagram is as follows:
Delta Connection Method
The delta connection method involves sequentially connecting the starting ends of each phase of the motor’s three-phase coil. The schematic diagram is as follows:
Differences between Star and Delta Connection in Voltage and Current
In the delta connection, the phase voltage of the motor is equal to the line voltage; the line current is equal to the square root of three times the phase current.
In the star connection, the line voltage is the square root of three times the phase voltage, while the line current is equal to the phase current.
Actually, it’s this simple. First, remember the appearance of the motor’s wiring terminals, a horizontal bar for the star (Y), and three vertical bars for the delta (Δ). Also, remember their differences, and you will be able to apply them with ease.
I hope everyone takes these wiring methods and precautions seriously and adheres strictly to the standards to ensure proper and safe wiring.
