Protection level: such as IP20 (indoor clean environment), IP54 (dustproof and splashproof), IP65 (dustproof and sprayproof), etc., selected according to the installation environment.
Cabinet size: determined by the number of internal components, heat dissipation requirements and installation space (width x height x depth).
Installation method: floor-standing, wall-mounted.
Color: common RAL 7035 (light gray) or specified by the customer.
Material: cold-rolled steel plate, stainless steel (corrosive environment).
Main circuit parameters:
Input side:
Rated input voltage: (such as 3-phase 380V AC, 400V AC, 480V AC, 690V AC; single-phase 220V AC).
Rated input frequency: (such as 50Hz / 60Hz).
Rated input current: the maximum input current that the cabinet is designed to carry.
Short-circuit withstand capacity: (unit kA), usually guaranteed by the incoming circuit breaker.
Output side:
Rated output voltage: (usually equal to the input voltage, or slightly lower).
Rated output current: The most critical parameter! It must be greater than or equal to the rated current of the driven motor, and take into account the overload margin (usually 1.1 - 1.2 times the rated current of the motor).
Output frequency range: (such as 0.1 - 400 Hz or higher, depending on the inverter model). Determines the motor speed range.
Adaptive motor power: The maximum motor power (kW or HP) that the cabinet can safely and reliably control, determined by the output current.
Core component - inverter:
Brand model: (such as Siemens SINAMICS G120, ABB ACS880, Danfoss VLT, Schneider Altivar Process, domestic Huichuan, INVT, etc.).
Rated power/current: The core parameters of the inverter body.
Overload capacity: (e.g. 110% 60s, 150% 3s). To deal with startup or instantaneous overload.
Carrier frequency: (adjustable range, such as 2-16kHz). Affects noise, heat, and motor insulation.
Control mode: V/F control, open-loop vector control, closed-loop vector control (encoder feedback required).
Communication interface: Standard (e.g. RS485, Modbus RTU) or optional (e.g. Profibus DP, CANopen, Ethernet/IP, Profinet, EtherCAT).
I/O points: The number and type of digital input/output (DI/DO), analog input/output (AI/AO).
Braking mode: Built-in brake unit power / external brake unit and brake resistor interface parameters.
Control loop parameters:
Control voltage: Power supply (such as AC 220V, DC 24V) provided to PLC, relays, HMI, sensors, etc. Usually provided by an independent control transformer or switching power supply.
Control elements:
PLC: Brand model, I/O points, program capacity, communication capability (if integrated).
HMI (touch screen): Size, resolution, communication interface.
Relay/contactor: (used for auxiliary control, power frequency bypass switching, etc.) Coil voltage, contact capacity.
Instrument: (such as ammeter, voltmeter, frequency meter, power meter) Range, accuracy.
Terminal block: Specification model.
Protection elements:
Incoming circuit breaker: Rated current, breaking capacity, tripping characteristics.
Output reactor/filter: (optional) Suppress output dv/dt, protect motor insulation, and reduce interference.
Input reactor/filter: (optional) Suppress input harmonics, protect the power grid, and reduce interference to other equipment.
EMC protection: Filtering, shielding, and grounding design comply with relevant electromagnetic compatibility standards.
Cooling system parameters:
Cooling method:
Natural cooling: Relying on the cabinet cooling holes, suitable for low power or low heat dissipation requirements.
Forced air cooling: The most common, using cabinet top fans or cabinet wall fans. Key parameters: fan voltage, power, air volume (CFM/m³/h), noise.
Air conditioning cooling: Suitable for high temperature environments or high power and high heat cabinets. Key parameters: Cooling capacity (kW).
Radiator/air duct: The design of the inverter built-in radiator or external heat dissipation duct.

Stepless and smooth speed regulation: Core advantage! The motor speed can be adjusted arbitrarily within the set range to meet the needs of precise process control (such as flow, pressure, tension, line speed).
Soft start/soft stop: The starting current can be limited to 1.0 - 1.5 times the rated current, which greatly reduces the impact of the power grid and mechanical impact and prolongs the life of the equipment. The acceleration and deceleration time can be set.
High starting torque: (in vector control mode) It can provide high starting torque (usually up to 150%-200% rated torque) at low speed or even zero speed to meet the needs of heavy-load starting.
Multiple control modes: V/F control (simple and general), open-loop vector control (better speed/torque control), closed-loop vector control (high-precision speed/torque control, encoder required).
Significant energy saving effect: One of the core advantages! For variable torque loads such as fans and pumps, the power consumption is proportional to the cube of the speed. Reducing the speed can bring huge energy savings (usually 20%-60%).
Functional features:
Rich control logic: Complex start and stop, speed regulation, interlocking, and sequence control can be achieved through PLC or built-in logic of the inverter.
Perfect protection function:
Input side: overvoltage, undervoltage, phase loss, and short circuit protection.
Output side/motor: overcurrent, overload, overheating, overvoltage, undervoltage, phase loss, grounding fault, motor blocking, stall prevention, etc.
Self-protection: overheating protection, communication failure, etc.
Powerful communication and integration capabilities: Standard or optional multiple industrial bus interfaces, easily integrated into DCS, SCADA and other host systems to achieve remote monitoring, data acquisition, and parameter setting.
Multiple operation modes: local (cabinet door button/knob/HMI), remote (terminal signal), and host computer communication control.
PID adjustment function: Built-in PID controller can directly receive process feedback signals (such as pressure, flow, temperature), and automatically adjust the motor speed to maintain constant process parameters.
Multi-speed operation/program operation: Preset multiple speed gears or automatically run according to the time program.