How should the control box on the conveyor belt be designed?

time：2025-03-22 Edit：switchgear view：21

The design of the control box on the conveyor belt needs to combine the **electrical control requirements**, **mechanical structure

**, **environmental conditions** and **safety standards**. The following are the systematic design steps and key points:

I. Clarify the design requirements

1. **Parameters of the conveyor belt**

- Motor power, voltage, rotational speed, starting mode (direct start/frequency conversion start).

- Load type: The conveyor belt is a **constant torque load**, and the motor starting current (usually 4 to 7 times the rated current)

needs to be considered.

- Control functions: Start-stop control, speed regulation (if there is a frequency converter), emergency stop, fault alarm, sensor

signal input (such as limit switches, photoelectric sensors).

2. **Environmental conditions**

- Indoor/outdoor: Outdoor use requires waterproofing (IP54 or above);

- Dust/humidity: In a dusty environment, dust prevention (IP5X) is required, and in a humid environment, prevention of

condensation is necessary;

- Temperature range: -10°C to 50°C (heat dissipation needs to be considered).

II. Electrical system design

1. Main circuit design

Component	Function	Selection suggestion (taking Chint as an example)
Circuit breaker	Main power switch and short-circuit protection	NXB-63/3P (Type D, rated current ≥ 1.2 times the motor current)
Contactor	Motor start-stop control	NC2-32 (Coil voltage AC220V)
Frequency converter	Speed regulation (optional)	NVF300 series (Power matches the motor)
Thermal relay	Motor overload protection	NR2-32 (Set current = Motor rated current)
Motor	Drive the conveyor belt	Three-phase asynchronous motor (such as YE3 series)

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