PXe-PI550 High Performance Current Vector Inverter

Q: What is the PI550 current vector inverter used for?

The PI550 is used to control AC motors in demanding industrial applications where stable speed, torque and process control are required. Typical uses include pumps, fans, compressors, conveyors, textile machinery, water treatment systems and production equipment.

Q: What is the difference between a current vector inverter and a standard variable frequency drive?

A standard variable-frequency drive controls motor speed by varying the output frequency and voltage. A current vector inverter provides more advanced motor control by managing current and torque behaviour more precisely, thereby improving response and stability under changing load conditions.

Q: Does the PI550 support sensorless vector control?

Yes. The PI550 supports vector control without encoder feedback and V/F control. This makes it suitable for many industrial motor applications that require improved speed and torque control without installing a motor encoder.

Q: Can the PI550 be used for pump and fan control?

Yes. The PI550 includes built-in PID control, making it suitable for pressure, flow and ventilation control applications. This is useful for pumps, fans, water treatment systems and HVAC-related equipment.

Q: Does the PI550 include RS485 communication?

Yes. Built-in RS485 communication enables the inverter to be integrated into control systems that require remote monitoring, control, or automation.

Q: What protection functions are included?

The PI550 includes inverter protection functions for overvoltage, undervoltage, overcurrent, overload, overheating, communication faults, external faults, and short-circuit-to-ground conditions.

Q: Is the PI550 suitable for heavy industrial applications?

Yes. The PI550 is positioned for more demanding industrial machinery and process applications than a compact general-purpose drive. It is better suited for applications where torque response, load variation, and continuous operation are important.

PX Electronics PI550 high-performance current vector inverters provide precise motor control for demanding industrial machinery, process equipment and automation systems. Designed around DSP control and current vector technology, the PI550 Series delivers stable speed and torque control for applications where load behaviour, response time and reliability are critical.

With V/F control, sensorless vector control, built-in PID, RS485 communication and flexible input/output options, the PI550 is suited to pumps, fans, compressors, conveyors, textile machinery, cable production, water treatment and heavy industrial equipment.

Technical Highlights for Industrial Motor Control:

Current vector control
Designed for precise control of motor voltage and current, supporting stable speed and torque performance in demanding machinery applications.

DSP-based control platform
Uses a DSP core controller to support fast response, reliable operation and consistent control behaviour across variable load conditions.

V/F and sensorless vector control
Supports V/F control and vector control without encoder feedback, making the drive suitable for a wide range of standard industrial motors.

Strong low-speed torque performance
The PI550 specification lists 150% starting torque at 0.5 Hz for G-type machines under sensorless vector control, making it suitable for applications where controlled start-up torque is important.

Built-in PID control
Supports closed-loop process control for pump, fan, pressure, flow and general automation systems.

Flexible control and communication
Supports keypad operation, terminal control and serial communication, with built-in RS485 for wider system integration.

Integrated inverter protection
Includes protection functions for overvoltage, undervoltage, overcurrent, overload, overheating, communication error, external fault and short circuit to ground conditions.

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Typical Applications:

Metallurgy and steel processing
Water treatment and pumping stations
Petroleum and chemical processing
Textile machinery
Cable and wire manufacturing
Conveyors and material handling
Compressors and fans
Power generation auxiliary systems
Photovoltaic support equipment
Industrial automation systems

The PXe-PI550 Series Inverter is engineered for high-performance motor vector control in complex and demanding industrial environments. Its advanced DSP core controller and proprietary vector control algorithm make it ideal for applications requiring precision, stability, and durability under challenging conditions.

This powerful inverter is well-suited for:

Metallurgy and Steel Processing

Delivering stable torque and speed control for rolling mills, furnaces, and cutting systems.

Petroleum and Chemical Industries

Ensuring reliable operation in explosive or high-temperature environments.

Textile Machinery

Providing accurate tension and speed regulation for spinning and weaving equipment.

Power Generation and Energy Systems

Supporting auxiliary systems and energy efficiency in thermal and renewable energy plants.

Water Treatment and Pumping Stations

Offering robust control for pumps and aeration systems.

Cable and Wire Manufacturing

Maintaining high-speed, precise control for extrusion and winding operations.

Photovoltaic Systems

Managing motor-driven tracking systems and cooling equipment with high efficiency.

From heavy-duty processing to precision manufacturing, the PXe-PI550 offers a flexible and high-performance solution for a broad spectrum of industrial automation needs.

Technical Specification
Power Input	Rated Voltage		AC 1PH 220V(-15%)~240V(+10%) / AC 3PH 220V(-15%)~240V(+10%) / AC 3PH 380V(-15%)~440V(+10%) / AC 3PH 480V(-10%)~480V(+10%)
	Input Frequency		50Hz/60Hz
	Allowable Fluctuation	Continuous Voltage Fluctuation: ±10%	The voltage imbalance rate is less than 3%
		Input Frequency Fluctuation: ±5%	Distortion rate meets the standard IEC61800-2
Control System	Control System		High-performance vector control inverter based on DSP
	Control Method		V/F control, vector control W/O PG
	Automatic Torque Boost Function		Realise low frequency (1Hz) and large output torque control under the V/F control mode
	Acceleration/Deceleration Control		Straight or S-curve mode. Four times available, and time range is 0.0 to 6500.0s
	V/F Curve Mode		Linear, square root/m-th power, custom V/F curve
	Overload Capability		G type: rated current 150% – 1 minute, rated current 180% – 2 seconds F type: rated current 120% – 1 minute, rated current 150% – 2 seconds
	Maximum Frequency		1 Vector control: 0 to 300Hz; 2 V/F control: 0 to 3200Hz
	Carrier Frequency		0.5 to 16kHz; automatically adjust carrier frequency according to the load characteristics
	Input Frequency Resolution		Digital setting: 0.01Hz Minimum analogue quantity: Maximum frequency 0.025%
	Starting Torque		G-type machine: 0.5Hz/150% (without PG vector control) F-type machine: 0.5Hz/100% (without PG daily control)
	Speed Range		1:100 (without PG vector control)
	Steady Speed Accuracy		No PG vector control: ≤ 0.5% (rated synchronous speed)
	Torque Response		≤ 20ms (without PG vector control)
	Torque Boost		Automatic torque boost; manual torque boost (0.1% to 30.0%)
	DC Braking		DC braking frequency: 0.0Hz to max. frequency Braking time: 0.0 to 100.0 seconds Braking current value: 0.0~100.0s
	Jogging Control		Jog Frequency Range: 0.00Hz to max. frequency Jog Ac/deceleration time: 0.0s-6500.0s
	Built-in PID		Easy to realise a closed-loop control system for process control.
	Automatic Voltage Regulation (AVR)		Automatically maintain a constant output voltage when the voltage of the electricity grid changes
Personalisation Function	Self-Inspection of Peripherals After Power-On		After powering on, peripheral equipment will perform safety testing, such as ground and short-circuit tests.
	Common DC Bus Function		Multiple inverters can use a common DC bus.
	Quick Current Limiting		The current-limiting algorithm is used to reduce the inverter’s overcurrent probability and improve the unit’s overall anti-interference capability.
	Timing Control		Timing control function: time setting range (0h to 6500h).
Running	Input Signal	DI1 Input Terminal	6 digital input terminals, DI5 can be high-speed pulse input (0~100kHz square wave)
		AI1 Analogue Input	1 analog AI1 input terminal, can choose 0~10V or 0~20mA input
		Multi-Speed	At most 16 speeds can be set(run by using the multi-function terminals or program)
		Emergency Stop	Interrupt controller output
		Fault Reset	When the protection function is active, you can automatically or manually reset the fault condition
		PID Feedback Signal	Including DC (0 to 10V), DC (0 to 20mA)
	Output Signal	Output Terminal	1 collector output terminal SPA; 1 relay output terminal; 1 DA1 analog output terminal
		SPA / Relay Output	Each port has 40 signals that can be optional, contact capacity of relay: normally open contact 5A/AC 250V; 1A/DC 30V
		DA1 Analog Output	1 analog output, 16 signals can be selected such as frequency, current, voltage and other output signal range (0 to 10V / 0 to 20mA)
	Running Command Channel		Three channels: operation panel, control terminals and serial communication port. They can be switched through a variety of ways.
	Run Function		Limit frequency, jump frequency, frequency compensation, auto-tuning, PID control
	Frequency Source		Total 9 frequency sources: digital, analogue voltage, multi-speed and serial port. They can be switched in a variety of ways
Protection Function	Inverter Protection		Overvoltage protection, undervoltage protection, overcurrent protection, overload protection, overheat protection (optional), external fault, communication error, PID feedback signal abnormalities, PG failure and short circuit to ground protection.
Display	LED Display Keyboard	Running Information	Monitoring objects including: running frequency, set frequency, bus voltage, output voltage, output current, output power, output torque, input terminal status, output terminal status, analogue AI1 value, motor actual running speed, PID set value percentage, PID feedback value percentage
		Error Information	Up to three error messages are saved. The time, type, voltage, current, frequency and work status can be queried when a failure has occurred
	Key Lock and Function Selection		The keypad can be partially or fully locked, and the function scope of some keys can be defined to prevent misuse
	IGBT Temperature		Display current IGBT temperature
Communication	RS485		Built-in RS485
Environment	Environment Temperature		-10°C~40°C (temperature at 40°C to 50°C, please derate for use)
	Storage Temperature		-20°C to 65°C
	Environment Humidity		Less than 90% R.H, no condensation of moisture
	Vibration		Below 5.9m/s²(=0.6g)
	Application Sites		Indoor, where there is no sunlight, corrosive substances, explosive gases, water vapour, dust, flammable gases, oil, mist, salt, etc
	Altitude		No need to degrade use under 1000m, degrade 1% for altitude rise 100m when above 1000m, do not use above 3000m
	IP Degree		IP20
Product Standards	Product Adopts Safety Standards		IEC61800-5-1:2007
	Product Adopts EMC Standards		IEC61800-3:2005
	Cooling Method		Forced air cooling