Lenze 00460544 ESMD751L4TXA SMD Frequency Inverter 0.75 kW
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Product Information
The Lenze 00460544, model ESMD751L4TXA, is a 0.75 kW (1.0 HP) frequency inverter from the Lenze SMD product series designed for variable speed control of standard three-phase AC induction motors. Operating across a 3-phase input supply range of 320 V AC to 528 V AC at 48 to 62 Hz, this drive provides flexible linear or quadratic V/f control profiles with an output frequency range of 0 to 240 Hz and an 8 kHz switching frequency. Built in an IP20 enclosure, the compact inverter features an integrated 3-digit LED keypad interface that allows operators to perform local monitoring, parameter adjustments, and direct start/stop operation without requiring external display units.
Control terminal connections on the ESMD751L4TXA include four programmable 0–24V DC digital inputs, one multi-range analog input supporting 0–10V, 0–20mA, or 4–20mA signals, and one changeover relay output rated for 250V AC at 3A. Putting a replacement unit into service is straightforward thanks to the pluggable Electronic Programmable Module (EPM), an onboard non-volatile memory chip that stores all application drive parameters. Transferring the EPM chip from an existing drive to a replacement spare configures the unit in seconds without software tools or external cabling, while ABC Industrial Parts can assist with parameter verification or external EPM programming using dedicated tools when needed.
System status and operating diagnostics are communicated through the integrated 3-digit LED display, which shows real-time output frequency during normal operation, parameter menus during configuration, and fault codes during trip conditions. The drive tracks operational events such as overcurrent (F1), overvoltage (F2), undervoltage (F3), motor or drive thermal overloads (F4–F6), output phase loss (F9), and EPM chip errors. When hardware failures like internal board errors (F8) or control faults (CF) occur, field repair is generally not possible, making drive replacement or testing through ABC Industrial Parts the most efficient path to restore machine operation.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 00460544 |
| Model/Type | ESMD751L4TXA |
| Product Family | SMD |
| Component Type | Frequency Inverter |
| Rated Power (kW) | 0.75 kW |
| Rated Power (HP) | 1.0 HP |
| Supply Voltage Range | 320 - 528 V AC (3-Phase) |
| Supply Frequency | 48 - 62 Hz |
| Rated Current (400V) | 2.4 A |
| Rated Current (480V) | 2.1 A |
| Output Frequency Range | 0 - 240 Hz |
| Switching Frequency | 8 kHz |
| Control Method | V/f Control (Linear or Quadratic) |
| Digital Inputs | 4 (0-24V DC logic) |
| Analog Inputs | 1 (0-10V, 0-20mA, or 4-20mA) |
| Digital Relay Outputs | 1 (Changeover relay, 250V AC / 3A) |
| Protection Rating | IP20 |
Programming and Configuration
Parameter programming on the Lenze ESMD751L4TXA is handled locally using the integrated 3-digit LED keypad or externally via the pluggable Electronic Programmable Module (EPM). The EPM chip retains all drive configuration data in non-volatile memory, allowing quick setup of motor parameters, acceleration and deceleration ramps, and V/f control profiles without requiring a continuous PC connection.
For duplicate drive commissioning or bench-top configuration, the EPM chip can be programmed off-line using the dedicated Lenze ESMD01 EPM Programmer. This tool enables parameter extraction from existing units or direct parameter loading prior to mounting the inverter into the control cabinet, significantly reducing downtime during replacement.
Communication and System Integration
Integration into control systems is accomplished through the drive's configurable I/O terminals. The ESMD751L4TXA features four programmable digital inputs operating on 0–24 V DC logic levels, enabling remote start/stop commands, direction selection, and multi-preset speed activation.
Speed references are provided via a single configurable analog input accepting 0–10 V, 0–20 mA, or 4–20 mA signals. Operational status signals and alarm outputs are routed through an integrated changeover relay output rated at 250 V AC / 3 A for direct connection to higher-level PLC inputs or indicator circuits.
Diagnostics and Status Indication
Diagnostic monitoring for the ESMD751L4TXA is driven by the front-panel 3-digit LED display. During normal active operation, the display continuously indicates the motor output frequency. When a fault condition occurs, the readout switches from output frequency to specific alphanumeric trip codes.
The combination of onboard LED readout and configurable relay alarm signaling allows technicians to quickly distinguish between external wiring issues, supply voltage instability, motor thermal trip events, and internal drive hardware faults.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| 3-Digit Display | Active | Displays output frequency during normal operation, parameter codes during programming, or fault codes during trip conditions. |
Replacement and Spare Part Considerations
Replacing a Lenze 00460544 drive requires matching electrical ratings (0.75 kW, 3-phase 320–528 V AC input) and physical terminal layouts. When swapping out a damaged unit for an identical ESMD751L4TXA spare, full parameter transfer is accomplished tool-free by transferring the pluggable EPM chip from the original drive directly into the replacement inverter.
If evaluating newer generation equipment for complete machine upgrades, the recommended successor series includes the Lenze i510 Cabinet and i550 Cabinet inverters. While these modern series offer expanded functionality, migrating to an i510 or i550 requires mechanical control panel changes and re-parameterization, making direct replacement with an original 00460544 drive the fastest route to minimize downtime.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| EPM | EPM Fault / Missing EPM | EPM chip missing, incorrectly seated, corrupted, or containing invalid parameter data. | EPM chip not fully plugged in; corrupted parameter memory; invalid data written to EPM. | Power off drive, firmly re-seat the EPM chip. If problem persists, reprogram EPM with ESMD01 programmer or replace EPM module. |
| F1 | Overcurrent | Inverter output current exceeded peak current threshold. | Short circuit or ground fault on motor output; acceleration time set too short; motor overload; excessive motor cable length. | Check motor wiring and motor insulation; increase acceleration ramp time; verify motor sizing against drive output rating. |
| F2 | Overvoltage | DC bus voltage exceeded upper limit. | Mains supply voltage too high; excessive regenerative energy during motor braking due to short deceleration time. | Check mains voltage; increase deceleration ramp time; install dynamic braking module/resistor if application requires fast stopping. |
| F3 | Undervoltage | DC bus voltage dropped below operational limit. | Mains voltage phase loss; supply line voltage collapse under load; transient power interruption. | Verify line input voltage across terminals L1, L2, L3; check supply fuses and input contactors. |
| F4 | Motor Overload (I²t) | Calculated motor thermal load limit exceeded continuous limit. | Motor operated at low speed under high load for extended duration without adequate cooling; motor bound or stalled. | Check mechanical load and motor movement; verify motor thermal parameters match nameplate; allow motor to cool. |
| F5 | Inverter Overload | Drive thermal capacity limit exceeded continuous current rating for too long. | Drive undersized for duty cycle; excessive continuous load current near peak threshold. | Reduce drive load; review acceleration/deceleration cycles; verify drive sizing for application. |
| F6 | Heatsink Overtemperature | Heatsink temperature exceeded safety threshold. | High ambient operating temperature; blocked cooling air vents; internal cooling fan failure or debris accumulation. | Clean heatsink cooling fins; verify enclosure ventilation; ensure minimum mounting clearances around drive; replace drive if fan failed. |
| F7 | External Fault | External fault trip triggered via digital input. | External monitoring device (e.g. thermal relay, safety switch) connected to digital input programmed for external trip. | Inspect external fault circuit connected to digital input terminals; clear fault condition on connected equipment. |
| F8 | Internal Fault | Hardware failure detected on main internal board or microprocessor fault. | Internal component failure; severe power surge damage. | Internal hardware fault — power cycle drive. If fault recurs immediately, unit is non-field-serviceable and must be replaced. |
| F9 | Motor Output Phase Failure | Open circuit detected on output terminals U, V, or W. | Motor cable disconnected; output contactor opened during run; open winding inside motor. | Check output cable connections between drive and motor; inspect output contactor interlocks; measure motor winding resistance. |
| CF | Control Fault | Internal microprocessor memory or control system error. | Control electronics hardware failure or corrupted internal memory. | Internal hardware fault — perform factory reset or power cycle. If fault persists, replace inverter unit. |
| cF | Communication Fault | Serial communication timeout or command sequence error. | Interrupted serial link; incorrect baud rate or station address settings; noise on comm lines. | Inspect communication wiring and shielding; check master controller status and comm parameters. |
Frequently Asked Questions
How do I transfer parameters to a replacement Lenze 00460544 drive?
Parameters are transferred by removing the pluggable Electronic Programmable Module (EPM) chip from the original drive and inserting it into the replacement ESMD751L4TXA unit before applying power.
What does an EPM fault code mean on the ESMD751L4TXA?
An EPM fault indicates that the memory chip is missing, improperly seated, corrupted, or contains invalid parameter data. Power off the drive, firmly re-seat the module, or re-program it using an ESMD01 EPM programmer.
What line supply voltage is required for the Lenze ESMD751L4TXA?
The drive requires a 3-phase AC input voltage between 320 V AC and 528 V AC at 48 to 62 Hz, drawing 2.4 A at 400V or 2.1 A at 480V.
Can the ESMD751L4TXA be replaced by a newer Lenze inverter series?
Yes, the designated successor models are the Lenze i510 Cabinet and i550 Cabinet inverters, though upgrading to these series requires panel modifications and parameter re-configuration.
How do I control the speed reference on this drive?
Speed reference can be set locally using the built-in 3-digit LED keypad or remotely using the analog input terminal configured for 0–10V, 0–20mA, or 4–20mA signals.
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