Lenze ESMD371X2SFA smd Frequency Inverter – 0.37kW 230V 1-Phase
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Product Information
The Lenze ESMD371X2SFA is a compact AC frequency inverter from the Lenze smd product family, designed to provide variable speed control for standard AC induction motors. Delivering 0.37 kW (0.5 HP) of output power, this drive operates on a 1-phase supply voltage ranging from 170 to 264 V AC at 230 V AC nominal, converting it to a 3-phase 230 V AC output. The unit features an IP20 protection rating and includes an integrated Class A RFI/EMI filter, indicated by the FA suffix, which reduces electromagnetic interference and eliminates the need for separate external mains filtering in industrial electrical enclosures.
Connecting to control systems via three freely programmable digital inputs, one flexible analog setpoint input supporting 0–10 V, 0–20 mA, and 4–20 mA signals, and a programmable relay output, the ESMD371X2SFA provides dynamic V/f characteristic motor control up to an output frequency of 240 Hz. Network capabilities can be added through an optional plug-in RS485 communication module supporting Modbus RTU or LECOM protocols. Commissioning a replacement unit is simplified by the removable blue Electronic Programmable Module (EPM) memory chip. Swapping the original EPM chip directly into a spare drive transfers all application parameters instantly without requiring software connections or manual keying. Where an original chip is damaged, datasets can be uploaded or cloned using the EEPM1RA EPM programmer or Lenze Global Drive Control software, with ABC Industrial Parts providing tested replacement drives to minimise machine downtime.
Diagnostic conditions and operating parameters are displayed directly on the front-panel 3-digit LED readout, with historic fault events stored in the P100 parameter log. Fault codes such as F.Oc for overcurrent, F.OU for DC bus overvoltage, F.LU for undervoltage, and F.AF for heatsink overtemperature allow maintenance personnel to quickly evaluate line, motor, or thermal issues. When codes such as F.cF, F.bf, or F.nt appear, or if EPM memory corruption (cF) persists after checking module seating, internal electronic or sensor failures are present that cannot be repaired in the field. In these instances, swapping the inverter unit or sourcing a refurbished exchange module through ABC Industrial Parts provides a safe, reliable return to operation.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | ESMD371X2SFA |
| Model / Type | Frequency Inverter |
| Product Family | smd |
| Rated Power (kW) | 0.37 kW |
| Rated Power (HP) | 0.5 hp |
| Supply Voltage | 230 V AC |
| Supply Voltage Range | 170 - 264 V AC |
| Supply Phases | 1 |
| Input Current | 5.1 A |
| Output Voltage | 230 V AC |
| Output Phases | 3 |
| Continuous Output Current | 2.4 A |
| Overload Capacity | 150% for 60s |
| Output Frequency Range | 0 - 240 Hz |
| Control Method | V/f characteristic control (linear or quadratic) |
| Protection Rating | IP20 |
| Integrated RFI Filter | Integrated Class A RFI/EMI Filter |
Programming and Configuration
Parameter configuration on the Lenze ESMD371X2SFA is structured within an accessible parameter range spanning P100 through P199. System operators can perform initial setup, adjust acceleration and deceleration ramps, and set linear or quadratic V/f characteristic profiles directly using the integrated front-panel keypad and 3-digit LED display.
Central to the drive's parameter architecture is the removable plug-in Electronic Programmable Module (EPM). Storing all user settings hardware-side, the EPM chip allows drive configurations to be cloned offline or duplicated across multiple inverters using the standalone EEPM1RA EPM programmer. Parameter backups can also be read and edited on a PC using Lenze Global Drive Control (GDC) software.
Communication and System Integration
While the ESMD371X2SFA includes standard terminal connections for physical control signals, industrial fieldbus connectivity can be integrated using an optional RS485 communication module. This module mounts directly to the inverter, providing serial communication capability over industrial networks.
When equipped with the RS485 module, the drive supports Modbus RTU and LECOM protocols. This allows higher-level controllers such as PLCs or HMIs to remotely monitor drive status, adjust frequency setpoints, and trigger control commands over standard serial bus topologies.
Diagnostics and Status Indication
Operational state, output frequency, and diagnostic alarms on the ESMD371X2SFA are communicated via the front-panel 3-digit LED display readout. During standard operation, the readout displays the real-time output frequency or parameter values, while active fault conditions trigger specific fault code strings.
Fault tracking is enhanced by internal registers, including parameter P100, which stores active fault logs. Service engineers can inspect historical fault codes directly from the display keypad or remotely via Lenze Global Drive Control software when a communication module is installed.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| 3-digit LED Display | Red - Digital Readout | Displays operating output frequency, parameter values, or status and fault codes |
Replacement and Spare Part Considerations
Although the original Lenze smd frequency inverter series has been discontinued by the manufacturer, replacement units remain essential for maintaining existing production equipment. When replacing an ESMD371X2SFA, maintenance teams must ensure the replacement matches the specific voltage class (1-phase 230 V AC input), power output (0.37 kW / 0.5 HP), and integrated RFI filter configuration (FA suffix).
Swapping a faulty unit requires transferring the original blue EPM chip into the replacement drive. If the original EPM chip is unreadable or missing, a blank EPM module must be programmed with the drive configuration using the EEPM1RA programmer or loaded via Lenze Global Drive Control software.
Facilities planning long-term modernization can consider transitioning from the smd drive to Lenze's direct successor, the i510 Cabinet Series frequency inverter (part number i51AE137B1000000S). However, because mechanical mounting footprints and wiring layouts differ, direct unit replacement with an identical ESMD371X2SFA spare remains the fastest plug-in option for urgent repairs.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| F.AF | Heatsink Overtemperature | Drive heatsink temperature has exceeded the upper safety threshold. | Inadequate ventilation, ambient temperature too high, dirty heatsink, heavy overload. | Check cabinet ventilation, clean heatsink fins, reduce switching frequency or motor load. |
| F.bf | Brake Transistor Fault | Short circuit or failure in internal brake chopper transistor. | External brake resistor shorted, resistance too low, internal brake transistor failure. | Check brake resistor wiring and resistance. Internal hardware fault — if resistor is normal, replace drive unit. |
| F.cF | Internal Control Fault | Internal control logic or microcontroller error. | Severe electromagnetic interference (EMI), internal electronic failure. | Cycle main power. If fault persists, internal board-level failure — replace the unit or contact Lenze service. |
| F.EF | External Fault | External trip signal activated via digital input. | External safety circuit or sensor trip assigned to digital input configured as External Fault. | Check external devices, safety loop, and signal wiring connected to digital input. |
| F.IL | Input Phase Loss | Loss of AC mains supply input phase or severe voltage supply unbalance. | Blown main fuse, loose power supply connection, severe voltage drop. | Check AC supply voltage, input wiring, fuses, and power connections. |
| F.nt | Temperature Sensor Fault | Internal NTC heatsink temperature sensor open circuit or short circuit. | Internal temperature sensor failure or disconnected internal harness. | Internal hardware fault — return unit for repair or replace the inverter. |
| F.Oc | Overcurrent | Instantaneous output current exceeded permissible peak limit. | Short circuit or ground fault at motor terminals, acceleration time too short, motor stalled. | Check motor and motor cable for short circuits or ground faults. Increase acceleration ramp time (P102). |
| F.OF | Drive Overload (I x t) | Continuous motor current exceeded drive rating for extended duration. | Mechanical overload on motor, incorrect motor parameters, heavy duty cycle. | Check mechanical load, motor current draw, and drive sizing for application. |
| F.OU | DC Bus Overvoltage | DC bus voltage exceeded maximum upper threshold. | Deceleration ramp time too short (regenerative braking energy), mains voltage too high. | Increase deceleration ramp time (P103) or connect dynamic braking resistor. |
| F.LU | DC Bus Undervoltage | DC bus voltage dropped below minimum lower threshold. | Main AC supply interruption, supply voltage sag, blown line fuse. | Check mains input line voltage and power quality. |
| F.SF | System Fault | Internal microprocessor communication fault or hardware failure. | EPM socket contact problem, severe electrical noise, internal board failure. | Ensure EPM chip is securely seated; cycle power. If error persists, internal hardware fault — replace unit. |
| cF | EPM Data Error | EPM memory module contains invalid or corrupted parameter data. | EPM module missing, corrupted data structure, EPM from incompatible drive series inserted. | Verify EPM module insertion. Perform factory reset (P100=1) or program EPM with valid dataset using EPM programmer. |
| cFr | EPM Reset Active | Drive loaded OEM default parameters from EPM memory module. | Factory reset initiated or blank EPM module detected. | Configure motor and application parameters or clone parameter set from valid EPM. |
Frequently Asked Questions
How do I transfer parameters to a replacement Lenze ESMD371X2SFA inverter?
Parameter transfer is accomplished by removing the original blue EPM (Electronic Programmable Module) memory chip from the old drive and inserting it into the replacement unit. All configuration settings are transferred instantly without needing software or manual keying.
What should I check if the ESMD371X2SFA displays fault code F.Oc?
Fault code F.Oc indicates an overcurrent condition. Inspect the motor and motor power cabling for short circuits or ground faults, verify that the motor is not stalled or mechanically blocked, and consider increasing the acceleration ramp time via parameter P102.
Can the Lenze ESMD371X2SFA connect to fieldbus communication networks?
Yes, fieldbus communication is possible by installing an optional plug-in RS485 communication module, which enables Modbus RTU or LECOM serial communication protocols for integration with PLCs and control networks.
What is the direct successor model for the discontinued Lenze ESMD371X2SFA?
Lenze designates the i510 Cabinet Series frequency inverter (part number i51AE137B1000000S) as the official direct successor for the ESMD371X2SFA.
What does the FA suffix in the part number ESMD371X2SFA indicate?
The FA suffix denotes that the inverter includes an integrated Class A RFI/EMI filter, providing internal electromagnetic compliance without requiring external mains line filters.
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