Lenze AC-760 Type 764 Frequency Inverter
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Product Information
The Lenze AC-760 Type 764 is a 3-phase AC frequency inverter within the Lenze 760 Series designed for variable speed control of standard asynchronous AC motors up to 2.2 kW. Operating on a rated input mains supply of 380 V to 415 V AC, this drive supplies a continuous output current of 5.5 A across an output frequency range of 0 Hz to 120 Hz. Built on a scalar V/f (voltage-to-frequency) control architecture, it provides reliable open-loop speed management for industrial applications such as conveyors, material handling drives, ventilation fans, and pumps.
Connecting the drive into a control cabinet is handled through heavy-duty screw terminals for mains input, motor output, start/stop control signals, analog setpoints, and status feedback. Commissioning a replacement unit does not require proprietary programming software or specialized cables, as parameter adjustment is executed entirely via front-panel potentiometers and switch selectors. To put a replacement AC-760 into service, technicians must match the physical potentiometer positions and DIP switch settings for minimum and maximum frequency setpoints, gain calibration, and acceleration or deceleration ramps. ABC Industrial Parts can assist in sourcing operational replacement units to minimize system downtime.
Operational monitoring and diagnostic feedback are provided directly on the front bezel via dedicated status LEDs for POWER, READY, and TRIP conditions, alongside a built-in fault relay output for remote signaling. Common drive trips include overcurrent, DC bus overvoltage, mains undervoltage, and heatsink overtemperature, which can be evaluated by checking power lines, motor winding insulation, ramp settings, and cabinet cooling. If an internal power stage or control board fault occurs that cannot be resolved through external checks, ABC Industrial Parts can provide tested exchange units or repair solutions to restore production.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | AC-760 |
| Model / Type | Type 764 |
| Product Family | Lenze 760 Series |
| Component Type | Frequency Inverter |
| Supply Voltage | 380 - 415 V AC |
| Continuous Output Current | 5.5 A |
| Rated Power | 2.2 kW |
| Output Voltage Range | 0 - 380/415 V AC |
| Output Frequency Range | 0 - 120 Hz |
| Control Method | Scalar V/f Control |
Diagnostics and Status Indication
The Lenze AC-760 frequency inverter features hardware-based status monitoring designed for fast troubleshooting in the field. The front bezel incorporates three status LEDs: POWER indicates the presence of mains supply voltage, READY signals that the drive is energized and prepared for operation, and TRIP alerts operators to an active fault condition.
In addition to visual LED indicators, the unit includes a dedicated fault relay output for remote monitoring and drive status signaling within the wider machine safety loop. Signal integrity and terminal control voltages can also be verified directly using standard multimeter checks.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| POWER | Solid | Mains supply voltage present |
| READY | Solid | Drive is energized and ready for operation |
| TRIP | Solid | Drive fault condition detected |
Replacement and Spare Part Considerations
When replacing a failed Lenze AC-760 Type 764 inverter, hardware setup parity is essential. Because parameterization is conducted without software files, technicians must carefully transfer all physical potentiometer settings—including minimum and maximum frequency, gain, acceleration, and deceleration—from the original unit to the replacement drive prior to powering up.
It is vital to confirm that the existing motor does not exceed the drive's 2.2 kW power rating and 5.5 A continuous output current limit at 380 V to 415 V AC. For long-term machine upgrades or full panel retrofits where modern drive architecture is preferred, the recommended functional replacement path is the Lenze i550 cabinet inverter series (part number i55AE222F10000000S).
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| TRIP (Overcurrent) | Overcurrent / Short Circuit | Drive tripped due to excess current on output terminals or short circuit. | Motor winding short circuit, ground fault, excessively short acceleration ramp, or motor overload. | Check motor and cable insulation. Increase acceleration time. Verify motor load. |
| TRIP (Overvoltage) | DC Bus Overvoltage | Drive tripped due to overvoltage on the internal DC bus capacitor bank. | Excessive regenerative energy during deceleration or high line voltage. | Increase deceleration ramp time or check supply voltage. |
| TRIP (Undervoltage) | Mains Undervoltage | Mains voltage dropped below operational threshold. | Mains power supply interruption or phase loss. | Check incoming 3-phase power supply lines and fuses. |
| TRIP (Overtemperature) | Heatsink Overtemperature | Inverter heatsink temperature exceeded allowable threshold. | Clogged heatsink fins, failed cooling fan, or excessive ambient temperature. | Clean heatsink, ensure adequate cabinet ventilation, and verify ambient temperature. |
Frequently Asked Questions
How is the Lenze AC-760 frequency inverter programmed?
The Lenze AC-760 does not require software tools or programming cables. Commissioning and parameter settings are managed directly using integrated hardware potentiometers and switch selectors on the front panel.
What is the rated power and output current of the Lenze AC-760 Type 764?
The drive operates on a 380 V to 415 V AC mains supply, delivering up to 5.5 A of continuous output current for standard 3-phase asynchronous motors up to 2.2 kW.
How do I transfer parameter settings to a replacement Lenze AC-760 unit?
Parameter transfer is accomplished by manually copying the physical alignments of the front-panel potentiometers and switches from the old unit to the replacement drive.
What status indicators are available on the front panel of the AC-760?
Front-panel status LEDs include POWER (mains supply voltage present), READY (energized and ready for operation), and TRIP (drive fault condition detected).
What is the recommended modern replacement for the Lenze AC-760 Type 764?
For modern system retrofits, the recommended functional upgrade path is the Lenze i550 cabinet inverter series, specifically part number i55AE222F10000000S.
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Data backup and recovery
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Specific firmware and hardware versions
If you are working with specific hardware or firmware versions that are no longer available from the manufacturer, ABC Industrial Parts is your partner. When making your enquiry, clearly state which versions you need, we will then look at the possibilities of supplying those versions, so that your installations continue to function optimally.
Disclaimer:
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