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5. A kind of The main circuit wires and power lines shall be marked in yellow, green and red, and the power lines with working voltage of AC380V and above shall be connected with black wires; the power lines with working voltage of AC220V shall be connected with red wires, and the 0V common terminal wires shall be connected with white wires; the power lines with working voltage of DC24V and below shall be connected with blue wires, and the current transformer wires shall be connected with Color line.

⒍ the grounding conductor of the components in the electrical cabinet shall be grounded independently, and parallel connection is not allowed. For the electrical cabinet with frequency converter, the grounding of frequency converter shall be separately grounded with PLC control circuit. In case of no guarantee of independent grounding, in order to reduce the interference of frequency converter to controller, the control circuit grounding can float, but the frequency converter must be reliably grounded. In addition, the shield wire in the control system also needs to be grounded.

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