Lenze 745/Ef3 EVF745-E Frequency Inverter Drive 2.2 kW
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Product Information
The Lenze 745/Ef3, also designated as the EVF745-E, is a 2.2 kW AC frequency inverter drive from the Lenze 740 Series, engineered for variable speed control of three-phase asynchronous induction motors. Housed in a compact IP20 enclosure designed for panel mounting inside electrical cabinets, the drive operates from a three-phase mains supply between 380 V and 480 V AC. It provides a rated continuous output current of 5.6 A and delivers up to 8.4 A peak current (150% overload capability) for up to 60 seconds during high-torque acceleration phases. Utilizing V/f characteristic control with an adjustable output frequency up to 480 Hz, it is commonly installed in industrial ventilation fans, centrifugal pumps, material handling conveyor systems, and general machinery applications.
For integration into machine control systems, the drive includes integrated screw terminals for direct hardwired control of digital start/stop commands, analog speed setpoints, and status signals. Expansion options include plug-in fieldbus modules for LECOM-A/B serial communication (RS-232 or RS-485 via 2102, 2111, or 2112 modules) and PROFIBUS-DP integration via the 2131 module slot. Commissioning a replacement unit requires transferring stored parameters from the drive non-volatile EEPROM memory. Drive parameter sets can be uploaded, saved, and transferred using the optional Lenze 2102 Operating Module keypad or Lenze Global Drive Control (GDC) software, ensuring the spare drive matches the motor ratings, ramp times, and bus parameters of the original system. ABC Industrial Parts can support maintenance teams with donor parameter extraction and replacement drive preparation to streamline installation.
System status and fault conditions are reported through two dedicated status LEDs on the drive: a solid green READY LED indicating line power and operational readiness, and a red TRIP LED that illuminates or flashes when an error occurs. When equipped with the Lenze 2102 keypad module, specific fault codes such as overcurrent (OC1–OC4), DC bus overvoltage or undervoltage (OU, LU), heatsink overtemperature (OH), or phase failure (PE) are displayed directly for rapid analysis. Basic diagnostic checks should include measuring incoming three-phase supply voltages, inspecting output wiring for phase-to-ground faults, and verifying option module connections. When severe conditions like internal EEPROM failure (EE) or output power stage damage occur, the unit cannot be repaired on site, making a fully tested replacement drive or unit repair through ABC Industrial Parts the most practical path to restoring production.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 745/Ef3 |
| Model / Type | EVF745-E |
| Product Family | 740 Series |
| Component Type | Frequency Inverter Drive |
| Rated Power | 2.2 kW |
| Supply Voltage Range | 380 - 480 V AC |
| Rated Output Current | 5.6 A |
| Peak Output Current | 8.4 A (150% for 60 s) |
| Control Principle | V/f Characteristic Control |
| Maximum Output Frequency | 480 Hz |
| IP Rating | IP20 |
| Form Factor | Compact Wall-Mount Cabinet Drive |
Programming and Configuration
Programming and parameter management on the Lenze 745/Ef3 frequency inverter are conducted using the optional Lenze 2102 Operating Module keypad or Lenze Global Drive Control (GDC) PC software connected through a LECOM interface module. All drive parameters—including acceleration and deceleration times, V/f characteristic curve settings, frequency limits, and motor thermal overload thresholds—are stored in non-volatile internal EEPROM memory.
The plug-in Lenze 2102 keypad allows technicians to adjust parameters locally without requiring a PC. The keypad also supports parameter cloning, enabling an entire drive configuration to be read from a donor unit and written directly into a replacement 745/Ef3 drive. Alternatively, Global Drive Control (GDC) software provides a graphical interface for archiving parameter files to disk, modifying parameter values online, and performing factory default resets when required.
Communication and System Integration
The Lenze 745/Ef3 frequency inverter features integrated screw terminals for standard hardwired control circuits. These terminals accommodate analog setpoint inputs (voltage or current), digital enable and start/stop signals, and relay status outputs for direct integration with conventional relay logic or PLC I/O boards.
To integrate the unit into higher-level industrial networks, optional plug-in communication modules are supported. Serial fieldbus communication via LECOM-A/B (RS-232 or RS-485) is available using the 2102, 2111, or 2112 interface modules. For PROFIBUS-DP systems, installing the 2131 module into the option slot enables setpoint control, operational state monitoring, and remote parameter adjustment from a central PLC.
Diagnostics and Status Indication
Diagnostic indication on the drive front panel is provided by two LEDs. The green READY LED remains continuously illuminated when the internal power supply is within operating limits and the inverter is ready for operation. The red TRIP LED lights solid or blinks when an internal protection circuit triggers a shutdown due to an operational fault.
Detailed error diagnosis is available by connecting the Lenze 2102 Operating Module keypad, which displays active fault codes directly on its readout. Remote diagnostic register values and operational parameters can also be evaluated over LECOM using Global Drive Control (GDC) software.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| READY | Green - Solid | Inverter is powered and ready for operation |
| TRIP | Red - Solid / Flashing | Inverter has tripped on a fault condition |
Replacement and Spare Part Considerations
When replacing a Lenze 745/Ef3 (EVF745-E) drive, verify that the physical part number and power ratings match the original unit. The replacement drive must support a 380–480 V AC three-phase supply and provide 5.6 A continuous output current to maintain safe thermal and electrical operation within the enclosure.
Replacement drives are shipped in factory default configuration and will not operate correctly until the original application parameters are loaded. Copy the parameter set from the existing drive using a Lenze 2102 keypad or GDC software backup before swap-out. In addition, transfer any installed communication modules (such as LECOM or PROFIBUS-DP 2131 cards) to the replacement drive, ensuring that fieldbus addresses and baud rates match the existing network settings.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| OC1 | Short Circuit | Short circuit or earth fault detected on inverter output terminals. | Short circuit in motor winding or cable; ground fault; motor cable too long; internal power stage damage. | Check motor and output wiring for insulation failure and short circuits. If fault persists with motor disconnected, internal inverter hardware is damaged requiring repair/replacement. |
| OC2 | Overcurrent during Acceleration | Output current limit exceeded during acceleration ramp. | Acceleration time (t_acc) set too short; excessive load inertia; motor size mismatched. | Increase acceleration time setting; check mechanical load for binding. |
| OC3 | Overcurrent during Constant Operation | Output current limit exceeded during steady-state operation. | Sudden load surge or mechanical jam; motor overload. | Inspect mechanical system for blockage; verify motor sizing and load requirements. |
| OC4 | Overcurrent during Deceleration | Output current limit exceeded during deceleration ramp. | Deceleration time (t_dec) set too short; regenerate energy excessive. | Increase deceleration time; fit external braking resistor module if required. |
| OU | Overvoltage in DC Bus | DC bus voltage exceeds upper threshold limit. | Mains supply voltage too high; excessive generatoric energy during braking without braking module. | Extend deceleration time; check mains supply voltage; install braking module and braking resistor. |
| LU | Undervoltage in DC Bus | DC link voltage dropped below lower threshold limit. | Mains voltage drop; line phase loss; brownout. | Measure line input voltage across all 3 phases; check input fuses and line contactor. |
| OH | Heatsink Overtemperature | Inverter heatsink temperature exceeded allowable operating limit. | Insufficient cooling airflow; ambient temperature too high; clogged heatsink fins; internal cooling fan failure. | Clean heatsink cooling fins; verify enclosure ventilation; ensure cooling fan operates correctly. |
| OH4 | Motor Overload (I²t) | Calculated thermal load of motor has exceeded protection limit. | Continuous operation at low speed under high load; motor thermal overload protection triggered. | Allow motor to cool down; check motor sizing and forced cooling fan availability. |
| PE | Phase Failure | Input line supply phase missing. | Blown input line fuse; loose input power connection. | Check incoming 3-phase mains connections and line fuses. |
| EE | EEPROM Fault | Internal non-volatile parameter memory error. | Corrupted parameter memory; internal control board fault. | Perform factory default reset. If fault persists, internal control board has failed — return unit for repair or replace drive. |
| CE0 | Communication Error | Communication failure between control module and host system / LECOM interface. | Loose plug-in module connection; cable break; serial baud rate mismatch. | Check communication interface seating, wiring, and baud rate setting. |
Frequently Asked Questions
How do I back up and transfer parameters to a replacement Lenze 745/Ef3 drive?
Parameters stored in the drive EEPROM memory can be copied using the plug-in Lenze 2102 Operating Module keypad or saved to a PC using Lenze Global Drive Control (GDC) software via a LECOM interface module. Once saved, the file or keypad memory can be downloaded into the replacement drive.
What causes an OC1 fault code on the Lenze 745/Ef3 drive?
An OC1 fault indicates a short circuit or ground fault on the inverter output terminals. Causes include damaged motor cables, insulation failure in the motor windings, or damaged internal power transistors. If OC1 occurs with the motor wires disconnected, the internal power stage has failed.
Which fieldbus communication options are available for the Lenze 745/Ef3?
The Lenze 745/Ef3 supports LECOM-A/B (RS-232/RS-485) communication via the 2102, 2111, or 2112 plug-in operating modules, as well as PROFIBUS-DP network connectivity using the optional 2131 communication module.
What do the READY and TRIP LEDs indicate on the Lenze 745/Ef3?
The solid green READY LED indicates that mains power is connected and the inverter is ready to run. The red TRIP LED illuminates or flashes when an operational error or protection trip has shut down the drive output.
Can the Lenze 745/Ef3 drive handle high-inertia starting loads?
Yes, the drive delivers up to 8.4 A peak output current (150% of its 5.6 A rating) for up to 60 seconds, providing sufficient torque for starting high-inertia loads like industrial fans and conveyors.
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