Lenze ESMD251X2SFA INVERTER DRIVE 1.6AMP 1-3PH 0.25KW 230V – Frequency Inverter
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Product Information
The Lenze ESMD251X2SFA is a compact frequency inverter from the Lenze smd series, designed for controlled motor speed regulation in industrial automation applications. Engineered to drive standard three-phase AC induction motors rated up to 0.25 kW (0.33 HP), this IP20-rated variable frequency drive delivers a continuous output current of 1.6 A at 230 V AC using V/f control. The unit accepts a wide line input voltage range of 180 to 264 V AC and supports dual-input power configurations for both single-phase lines at 3.4 A input current and three-phase lines at 1.9 A input current. An integrated Class A EMC filter limits high-frequency line interference, while a 150% overload capacity for 60 seconds provides torque overhead for small conveyor belts, ventilation fans, and processing equipment.
Commissioning and parameter setup center around Lenze's pluggable Electronic Programmable Module (EPM) located on the front panel. Operating configurations are stored directly on this removable blue memory chip, which can be configured off-line using the Lenze EEPM1RA EPM Programmer or transferred directly to a donor unit during drive replacement. In addition to the EPM slot, the hardware features configurable digital and analog input terminals along with a programmable relay trip output contact for control circuit integration. Swapping the parameter-laden EPM chip directly into a replacement drive enables rapid restoration of system operation, with ABC Industrial Parts supplying tested replacement units to minimize operational downtime.
Real-time operating feedback and fault diagnostics are provided through a front-panel 3-digit LED display and integrated control keypad. The display shows live output frequency, operational status indications such as OFF or STOP, parameter index numbers, and error codes ranging from F1 to F8 and F0. System diagnostics begin with verifying that the line voltage remains within 180 to 264 V AC, inspecting field wiring connections, and checking that the EPM module is fully seated in its slot. If an F4 overcurrent code trips instantly at power-up without a motor connected, or if persistent internal hardware codes like F7 or F0 occur, the internal power stage or logic circuitry has experienced a hardware failure and requires unit replacement through ABC Industrial Parts.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | ESMD251X2SFA |
| Model / Type | INVERTER DRIVE 1.6AMP 1-3PH 0.25KW 230V |
| Product Family | smd |
| Component Type | Frequency Inverter |
| Rated Power (kW) | 0.25 kW |
| Rated Power (HP) | 0.33 HP |
| Supply Voltage | 230 V AC |
| Supply Voltage Range | 180 - 264 V AC |
| Supply Phase | 1-Phase / 3-Phase |
| Continuous Output Current | 1.6 A |
| Rated Input Current (1-Phase) | 3.4 A |
| Rated Input Current (3-Phase) | 1.9 A |
| Max Output Voltage | 230 V AC |
| Integrated EMC Filter | Class A |
| Output Frequency Range | 0 - 240 Hz |
| Switching Frequency | 8 kHz |
| Overload Capacity | 150% for 60s |
| Control Method | V/f Control |
| IP Rating | IP20 |
Programming and Configuration
Drive configuration on the Lenze smd series relies on the front-accessible Electronic Programmable Module (EPM). This removable chip stores the complete parameter set for the drive, permitting complete unpowered setup prior to installation. Technicians can adjust parameters directly via the 3-digit LED screen and front keypad or utilize the standalone Lenze EEPM1RA EPM Programmer to duplicate parameter files across multiple drives.
When commissioning or transferring settings, proper engagement of the EPM memory module in the drive's front housing is required. Key operational variables, including acceleration time parameter P104 and deceleration time parameter P105, must match the application requirements. If the drive is powered on with a missing or unseated EPM module, an F6 error code is generated, requiring drive power-down and physical re-inspection of the EPM chip seating.
Communication and System Integration
The ESMD251X2SFA integrates into automated control systems using hardwired terminal connections. The drive interface includes configurable digital inputs and analog input channels for variable speed command signals and run/stop commands. Output relay indication is provided through a programmable trip contact, allowing automated interlocks to respond to drive fault conditions.
Designed for 230 V AC AC induction motors up to 0.25 kW, the drive operates across an output frequency range of 0 to 240 Hz with an 8 kHz switching frequency. The built-in Class A EMC filter mitigates line-borne electrical interference to satisfy standard industrial compliance without requiring external line filters. Main power terminals support input wiring from either single-phase 230 V AC or three-phase 230 V AC supply networks.
Diagnostics and Status Indication
The Lenze ESMD251X2SFA includes a front-mounted 3-digit LED display that serves as the primary diagnostic tool. During standard operation, the display indicates active output frequency, status conditions such as OFF or STOP, and parameter values. In the event of a system trip, the display presents specific error codes (F1 through F8 and F0) to indicate the root cause of the interruption.
Fault notification is supplemented by the drive's programmable relay trip output contact, which changes state during a trip condition. Diagnostic procedures involve reading the fault code on the LED display, checking associated line and motor power wiring, verifying parameter values, and confirming proper mechanical loading on the motor shaft.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| 3-Digit LED Display | Digital Display | Displays live output frequency, operational status codes (e.g. OFF, STOP), parameter numbers/values, and trip fault codes (F1 through F8, F0). |
Replacement and Spare Part Considerations
When replacing an ESMD251X2SFA frequency inverter, verify that the replacement drive matches the power rating of 0.25 kW (0.33 HP) and continuous output rating of 1.6 A. Drive parameters can be quickly migrated by physically moving the original blue EPM chip into the front slot of the new drive, eliminating the need to reconnect external programming tools or re-enter parameter menus manually.
While the Lenze smd series is succeeded by the modern Lenze i510 series, replacing a unit with an exact ESMD251X2SFA drive avoids cabinet modifications or control rewiring. Ensure that line power is disconnected before installing or removing the EPM memory module to avoid parameter corruption.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| F1 | DC Bus Overvoltage | DC bus voltage exceeded the upper voltage threshold. | Deceleration ramp time too short; excessive motor regeneration; mains input supply voltage too high. | Increase deceleration time parameter (P105); check incoming line supply voltage. |
| F2 | DC Bus Undervoltage | DC bus voltage dropped below the minimum operating threshold. | Mains supply power interruption, dip, or missing supply phase. | Check line supply voltage and input power wiring connections. |
| F3 | Motor / Inverter Overload | I x t thermal overload threshold exceeded. | Mechanical overload or stall condition; continuous operation at low speeds with excessive current load. | Inspect mechanical load and motor shaft for binding; verify motor current setup parameter. |
| F4 | Overcurrent | Instantaneous peak output current limit exceeded. | Short circuit on motor phase wiring; earth fault on output cable; acceleration time too short. If fault occurs immediately without motor connected: internal output transistor / power stage hardware fault. | Check motor and wiring for short circuit or earth fault; increase acceleration time parameter (P104). If short circuit is ruled out and fault trips immediately at power-up without motor connected: internal hardware failure — replace unit. |
| F5 | Overtemperature | Heatsink temperature exceeds safety limit. | Blocked cooling airflow; dirty or restricted heatsink fins; high panel ambient temperature. | Clean heatsink cooling fins; verify enclosure ventilation and ambient temperature limits. |
| F6 | EPM Error | EPM memory module read/write fault or missing EPM chip. | EPM module missing or improperly seated in front slot; corrupted parameter checksum in EPM chip. | Power down drive, check EPM chip seating; re-program or swap EPM chip using EPM programmer. |
| F7 | Internal Fault | Internal control hardware failure or internal logic fault. | Internal electronic component failure or high electrical interference. | Internal hardware fault — turn off power and re-apply. If error persists, unit is not field-serviceable and must be replaced. |
| F8 | External Fault | External fault condition triggered via assigned digital input. | External protective contact or thermal switch connected to digital input opened. | Inspect external sensor, thermal switch, or interlock connected to the digital input. |
| F0 | CPU / System Fault | Microprocessor watchdog reset or firmware processing error. | Internal microprocessor fault or severe electrical noise. | Internal hardware failure — power cycle drive. If problem persists, replace drive. |
Frequently Asked Questions
How are parameters transferred when replacing a Lenze ESMD251X2SFA drive?
Parameters can be transferred by moving the blue Electronic Programmable Module (EPM) chip from the front slot of the original drive directly to the replacement unit. Alternatively, parameters can be cloned using the Lenze EEPM1RA EPM Programmer.
Can the ESMD251X2SFA drive operate on a single-phase supply?
Yes, the drive supports dual supply inputs and can operate on either a 1-phase 230V AC supply (3.4 A input current) or a 3-phase 230V AC supply (1.9 A input current) within a line range of 180 to 264V AC.
What does an F4 fault code indicate on the drive?
An F4 code indicates an overcurrent condition caused by output short circuits, earth faults, or excessively fast acceleration (P104). If the F4 fault occurs immediately upon powering up without a motor connected, it indicates an unserviceable internal power stage failure.
What is the recommended replacement series for new installations?
The Lenze i510 series is the recommended modern successor for new installations. However, direct replacement with an ESMD251X2SFA drive preserves existing control panel layouts and hardware compatibility.
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