Lenze 13126341 ESMD751X2SFA SMD Series Frequency Inverter 0.75kW
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Product Information
The Lenze ESMD751X2SFA, identified by part number 13126341, is a 0.75 kW (1.0 HP) frequency inverter from the Lenze SMD Series designed for scalar speed control of standard three-phase AC induction motors. Operating on a 200 to 240 V AC supply across either single-phase or three-phase line inputs, the unit provides a three-phase output voltage range of 0 to 230 V AC with a continuous output current rating of 4.0 A. Housed in a compact IP20 enclosure, this drive supports scalar V/f control with linear or quadratic characteristics, an output frequency range of 0 to 240 Hz, and an integrated Class A RFI EMC filter to ensure noise suppression without consuming additional cabinet panel space.
Connecting and commissioning a replacement ESMD751X2SFA unit is straightforward due to Lenze's Electronic Programmable Module (EPM). This removable plug-in memory chip stores all inverter parameters, enabling complete drive configuration transfer to a spare unit without requiring a PC, specialized software, or manual parameter entry. The drive control interface includes three programmable digital inputs, one programmable digital relay output, and one analog input supporting 0-10 V DC or 0/4-20 mA speed reference signals, alongside support for optional CANopen and Modbus RTU communication adapters. On-site parameter adjustments, ramp settings, and operating monitoring are handled via the integrated three-digit LED display keypad, while ABC Industrial Parts can assist when sourcing replacement units or matching drive configurations.
System diagnostics are managed through the front-panel three-digit LED display, which provides real-time readout of output frequency, active parameter settings, and diagnostic fault codes from F01 to F12. First-line field checks for trip conditions like overcurrent (F01), overvoltage (F02), undervoltage (F03), or motor overload (F04) should focus on incoming mains voltage, motor wiring integrity, mechanical load binding, and acceleration or deceleration ramp settings. Errors related to the memory chip (F08) or OEM parameter loading (F12) require checking physical module seating or restoring factory parameter blocks. When the inverter displays an internal hardware fault (F09), the internal control circuit is non-serviceable in the field, making replacement or tested repair through ABC Industrial Parts the recommended solution to restore operation.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 13126341 |
| Model / Type | ESMD751X2SFA |
| Product Family | SMD Series |
| Component Type | Frequency Inverter |
| Rated Power Output (kW) | 0.75 kW |
| Rated Power Output (HP) | 1.0 HP |
| Supply Voltage Range | 200-240 V AC |
| Supply Input Phase | 1-Phase / 3-Phase |
| Output Voltage Range | 0-230 V AC (3-Phase) |
| Continuous Output Current | 4.0 A |
| Output Frequency Range | 0-240 Hz |
| Switching Frequency | 4 kHz |
| Control Method | Scalar V/f Control |
| Digital Inputs | 3 |
| Digital Relay Outputs | 1 |
| Analog Inputs | 1 (0-10 V DC or 0/4-20 mA) |
| EMC Filter | Integrated Class A RFI Filter |
| Protection Rating | IP20 |
Programming and Configuration
Parameter setup and configuration management on the Lenze ESMD751X2SFA frequency inverter are centered around the removable Electronic Programmable Module (EPM). The EPM chip stores all drive configuration parameters, linear or quadratic V/f characteristic selections, acceleration and deceleration ramp times, and motor thermal protection profiles. Parameter sets can be pre-configured offline using a dedicated Lenze EPM Programmer or cloned directly from memory chip to memory chip without powering up the drive.
Onboard commissioning is completed using the integrated front-panel keypad and three-digit LED display. Operating personnel can navigate parameter structures, scale the analog speed reference input (0-10 V DC or 0/4-20 mA), and set operating logic for the three digital inputs and single relay output. In the event of parameter memory issues or an OEM load fault (F12), the inverter configuration can be reset back to standard factory parameters directly through the keypad menu.
Communication and System Integration
The ESMD751X2SFA frequency inverter integrates into automated machinery control schemes through hardwired I/O terminals and optional fieldbus protocol modules. The built-in terminal block provides three programmable digital inputs for run, stop, direction, or external fault signals, a programmable digital relay contact for fault or status monitoring, and one analog input configured for standard speed command signals.
For centralized control architectures, the drive supports optional fieldbus modules for CANopen and Modbus RTU network communication. These option modules enable fieldbus master controllers to monitor drive status, modify parameter values, and issue speed commands over serial connections. Proper network setup requires verifying node address configurations, baud rates, bus cable termination, and mechanical module seating to prevent fieldbus communication trip errors (F10).
Diagnostics and Status Indication
The ESMD751X2SFA features a front-panel three-digit LED display as its primary diagnostic and monitoring interface. During normal operation, the display presents output frequency, active operational status, or parameter indices. When an operating condition exceeds predefined safety limits, the inverter trips and displays an active fault code from F01 to F12.
In addition to real-time status output, the inverter retains recent fault codes in its memory. Technicians can review fault history via the keypad interface to identify intermittent issues, such as heat sink overtemperature (F06) caused by obstructed cooling fins or mains supply undervoltage (F03) resulting from line power fluctuations.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| 3-Digit LED Display | Active Display | Displays output frequency, active parameter code/value, or current status/fault code (e.g. F01-F12). |
Replacement and Spare Part Considerations
When replacing an ESMD751X2SFA drive, parameter configuration can be transferred instantly by moving the plug-in EPM chip module from the original drive to the replacement unit. This preserves all system parameters without requiring parameter programming tools or PC software. Prior to restoring power, verify that the replacement drive model matches the required supply voltage range of 200-240 V AC and the continuous output current rating of 4.0 A.
If migrating to a modern control platform, Lenze recommends several modern replacement options including the Lenze i510 Cabinet Series, Lenze i550 Cabinet Series, and Lenze SMVector Series inverters. When transitioning to newer drive series, terminal wiring assignments, control logic inputs, and parameter structures should be mapped prior to commissioning to maintain system compatibility.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| F01 | Overcurrent | Output current exceeded maximum instantaneous threshold limit. | Short circuit or ground fault on motor cable, rapid acceleration ramp, or motor overload. | Check motor and wiring for short circuit or earth fault. Increase acceleration ramp time. |
| F02 | Overvoltage | DC bus voltage exceeded upper limit threshold. | Deceleration ramp too short (regenerative braking energy back-fed from load) or high supply voltage. | Check mains voltage. Extend deceleration ramp time. |
| F03 | Undervoltage | DC bus voltage dropped below minimum threshold limit. | Mains supply power line failure, low incoming supply voltage, or brownout. | Check incoming AC power supply voltage and input fuses. |
| F04 | Motor Overload (I2t) | Calculated thermal load on motor exceeded safe continuous operating limits. | Continuous operation at low speed under high torque or incorrect motor rated current parameter. | Check motor load and mechanical binding. Verify motor current parameter setting. |
| F05 | Inverter Overload | Thermal loading of frequency inverter output power stage exceeded limits. | Operation beyond continuous current rating or inadequate heat sink cooling. | Reduce output current demand or check drive heat sink cooling airflow. |
| F06 | Overtemperature | Heat sink temperature exceeded maximum safe operating temperature. | Blocked cooling airflow, fan failure, or high enclosure ambient temperature. | Clean cooling fins, check cabinet ventilation, reduce ambient enclosure temperature. |
| F07 | External TRIP Fault | External fault signal activated via digital input terminal. | External safety relay, thermal switch, or interlock contact opened. | Inspect connected external safety circuits and external fault wiring. |
| F08 | EPM Error | Electronic Programmable Module (EPM) memory chip error or missing. | EPM chip not inserted, corrupted data on EPM, or bad contact socket connection. | Ensure EPM chip is fully seated in slot. Re-program EPM or replace module if defective. |
| F09 | Internal Hardware Fault | Internal microprocessor or control board hardware failure detected. | Internal component failure on control board. | Internal board-level fault — non-serviceable in field. Replace the inverter unit or return for repair. |
| F10 | Communication Fault | Communication interruption with optional fieldbus module. | Loose fieldbus cable, bus timeout, or improper termination. | Check communication cabling, node address setting, and bus master controller. |
| F12 | OEM Parameter Load Fault | Failed to load OEM parameter data set from EPM module. | Incompatible EPM data variant or corrupted OEM default parameter block. | Reset unit to standard factory parameters or reprogram EPM module with valid configuration. |
Frequently Asked Questions
How do I transfer parameters to a replacement Lenze ESMD751X2SFA drive?
Parameter transfer is completed by moving the plug-in Electronic Programmable Module (EPM) chip from the old drive to the replacement unit. When powered up, the replacement inverter automatically reads the stored parameters without needing software or manual programming.
What power input options does the ESMD751X2SFA support?
The ESMD751X2SFA operates on a supply voltage range of 200 to 240 V AC and supports both single-phase and three-phase AC input power connections.
What does fault code F08 indicate on the drive display?
Fault code F08 indicates an EPM error. This occurs if the EPM memory chip is missing from its socket, poorly seated, or contains corrupted configuration data. Verify that the chip is firmly inserted or reprogram it using an EPM Programmer.
Can the ESMD751X2SFA connect to fieldbus communication networks?
Yes, optional plug-in modules are available to integrate the ESMD751X2SFA inverter into CANopen and Modbus RTU fieldbus networks.
How should an internal hardware fault F09 be handled?
Fault F09 signifies an internal control board or microprocessor component failure. Because this is a board-level hardware fault, it cannot be serviced in the field. The inverter unit must be replaced or sent in for professional repair.
What current Lenze series can be used to modernize an ESMD751X2SFA installation?
Recommended modern migration options for legacy SMD series inverters include the Lenze i510 Cabinet Series, Lenze i550 Cabinet Series, and Lenze SMVector Series frequency drives.
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