i750

The i750 cabinet servo inverter provides everything for precise and dynamic motion control in complex multi-axis applications. Advanced safety functions and One Cable Technology reduce wiring and control complexity. Intelligent data-based functions and IIoT enable innovative motion control concepts.
As a single or double axis, the i750 cabinet with a matching supplier fits seamlessly into the Lenze automation system. The strengths of the inverter become apparent in numerous applications in combination with Lenze controllers and the FAST Application Software Toolbox. The scalable range of hardware, software, engineering services, and digital services supports the realization of integrated automation systems from the cloud to the drive shaft.
As a power extension of the i750 cabinet servo inverter in the range of 22 ... 110 kW, the i950 cabinet servo inverter can be used.

Highlights

Integrated DC-bus connection
Small overall width from 50 mm for the double axis
Axis modules capable of multiple overloads for peak output currents between 5 and 64 A, double axes up to 32 A
Integrated Functional Safety and One Cable Technology (OCT)
Autotuning function for quick and easy controller adjustment

Documentation

Title	File	Document type	Version
Brochure i750 cabinet servo inverter	Dokument Brochure_i750_cabinet_servo_inverter_Servoumrichter_EN.pdf	Brochure	07/2025
Flyer i750 cabinet servo inverter EN	Dokument Flyer_i750_cabinet_servo_inverter_EN.pdf	Flyer	03/2023

Error codes

Fault ID: 12816

Hex: 0x3210

Description: Fault - DC bus overvoltage

Keypad display: DC Bus OV
Cause	Remedy	Severity/response
DC-bus voltage has exceeded the error threshold for overvoltage due to a too high braking energy or a too high mains voltage. The error threshold (display in 0x2540:006 (P208.06) results from the setting of the rated mains voltage in 0x2540:001 (P208.01).	Reduce dynamic performance of the load profile. Check mains voltage. Check settings for brake energy management. 0x2541:001 (P706.01) = [0]: Connect brake resistor to the power unit and activate the integrated brake chopper	Fault

Fault ID: 12672

Hex: 0x3180

Description: UPS operation active

Keypad display: UPS oper. active
Cause	Remedy	Severity/response
Operation on uninterrupted 1x230V current supply (UPS) has been activated: Only a reduced output current is provided.	Switch back to operation with regular mains voltage	Warning

Fault ID: 12576

Hex: 0x3120

Description: Mains phase fault 

Keypad display: Mains Phase fail
Cause	Remedy	Severity/response
Mains phase failure	Check wiring of the mains connection. Check fuses.	Fault

Fault ID: 1030

Hex: 1030

Description: Undervoltage in the DC bus

Keypad display: LU
Cause	Remedy	Severity/response
DC bus voltage is lower than specified in C0173.	Check mains voltage Check supply cable	cawc

Fault ID: 1020

Hex: 1020

Description: Overvoltage in DC bus

Keypad display: OU
Cause	Remedy	Severity/response
Braking energy is too high. (DC−bus voltage is higher than set in C0173.)	Use braking unit or regenerative module. Check dimensioning of the brake resistance.

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