Lenze 00469191 ESMD251X2SFA AC Tech SMD Frequency Inverter
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Product Information
The Lenze 00469191, model ESMD251X2SFA, is a compact AC Tech SMD series frequency inverter designed for precise speed control of standard three-phase AC induction motors. Operating on a single-phase 230 V AC mains supply with an input voltage range of 170 to 264 V AC, the unit delivers controlled three-phase power up to 0.25 kW (0.33 HP) with a continuous rated output current of 1.7 A. The inverter regulates motor speed across an adjustable output frequency range from 0 to 240 Hz utilizing linear or quadratic V/f control. Housed in a space-saving IP20 enclosure, it supports dual mounting configurations for installation onto standard 35 mm DIN rails or direct cabinet panel mounting.
Control integration is facilitated through dedicated control terminal blocks containing three freely programmable digital inputs and one configurable analog input. Digital inputs accept signals for drive start/stop, direction change, and preset speed selection, while the analog input accommodates setpoint signals of 0–10 V, 0–20 mA, or 4–20 mA. Commissioning a spare unit relies on Lenze's Electronic Programmable Module (EPM) system. All drive parameters are stored on a removable blue EPM chip, allowing offline configuration duplication and chip-swapping parameter transfer without supplying main power to the inverter. When replacing a damaged unit, swapping the EPM chip restores operational parameters instantly, while support from ABC Industrial Parts can assist in parameter extraction and verifying memory integrity during system downtime.
Operational status and active diagnostics are indicated on the integrated front keypad, which features a three-digit red LED display. The panel presents real-time output frequency, parameter indexes, parameter values, and error codes covering conditions such as undervoltage, overvoltage, drive overload, heatsink overtemperature, external interlock trips, and memory faults. Initial checks should verify mains supply stability, motor lead integrity, cooling space, and secure EPM seating. If persistent hardware faults such as CPU errors occur, internal circuitry cannot be serviced in the field; sourcing a fully tested exchange drive or utilizing repair services via ABC Industrial Parts offers an efficient route to restore control functionality.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 00469191 |
| Model / Type | ESMD251X2SFA |
| Product Family | AC Tech SMD |
| Component Type | Frequency Inverter |
| Rated Power | 0.25 kW |
| Horsepower Rating | 0.33 HP |
| Supply Voltage | 230 V AC (170 - 264 V AC) |
| Input Phases | 1-Phase |
| Output Voltage | 230 V AC |
| Output Phases | 3-Phase |
| Continuous Output Current | 1.7 A |
| Output Frequency Range | 0 - 240 Hz |
| Control Method | V/f Control (Linear / Quadratic) |
| Digital Inputs | 3 Programmable |
| Analog Inputs | 1 Configurable (0-10 V, 0-20 mA, 4-20 mA) |
| Enclosure Rating | IP20 |
| Mounting Type | 35 mm DIN Rail / Panel Mount |
Programming and Configuration
Drive configuration and parameter adjustments are performed using the integrated front-panel keypad and three-digit LED display menu. Technicians can navigate parameter codes to define acceleration and deceleration times, select linear or quadratic V/f characteristic curves, and assign functional roles to control terminals. Default parameter initialization routines can also be executed directly via the keypad to return the drive to factory base settings.
The Electronic Programmable Module (EPM) functions as the central non-volatile parameter store for the inverter. Because the complete parameter set is stored on this removable chip, data can be cloned across multiple drives or written offline using an optional handheld Lenze EPM Programmer (model EEPM1RA). This offline capability eliminates manual parameter entry on production lines or during emergency drive replacement.
Communication and System Integration
The Lenze ESMD251X2SFA operates as a standalone drive accepting a single-phase 230 V AC supply and converting it into a controlled three-phase 230 V AC output for standard induction motors. Its wide input operating range of 170 to 264 V AC provides tolerance against main line voltage fluctuations commonly found in industrial distribution panels.
I/O terminal wiring interfaces directly with control devices. The three digital inputs can be configured for run enable, direction selection, external fault monitoring, or pre-set frequency references. The single analog input accepts 0–10 V, 0–20 mA, or 4–20 mA setpoint signals, allowing speed control integration with remote speed potentiometers, process sensors, or higher-level programmable logic controllers.
Diagnostics and Status Indication
Real-time operational feedback and fault monitoring are delivered via the front three-digit LED display keypad. The drive continuously evaluates key internal variables, including DC bus voltage level, output phase current, heatsink temperature, and EPM communication status.
When a fault condition occurs, the red LED display flashes an active fault code to identify the issue. During standard operation, the display presents the current output operating frequency or selected parameter addresses and values during keypad menu navigation.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| 3-digit LED Display | Red - Solid / Flashing | Displays output frequency, parameter codes, parameter values, or active error codes (e.g., F1-F9, CF, cEF). |
Replacement and Spare Part Considerations
When selecting a replacement drive, ensure exact matching of part number 00469191 and model identifier ESMD251X2SFA to guarantee identical physical mounting dimensions, terminal arrangement, and power ratings. Transferring the original blue EPM chip directly into the replacement drive copies all application parameters instantly, removing the requirement to re-commission the drive manually.
If the replacement unit indicates an EPM fault (F8) or OEM data error (cEF) following chip insertion, verify that the module is fully inserted into its slot and that firmware revisions align. For new system designs or plant modernizations where the legacy AC Tech SMD series is being updated, Lenze recommends migrating to the i510 Cabinet series (such as model i51AE125B1001000S).
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| F1 | Internal Fault / Hardware Error | Internal control board fault or CPU hardware error. | Internal electronic defect or transient processor crash. | Power cycle the unit. If the error persists, return unit for repair or replace the drive. |
| F2 | Overcurrent / Short Circuit | Inverter output peak current exceeded limit. | Short circuit on output cables, ground fault, acceleration time too short, motor undersized, or drive failure. | Check motor and output wiring for short circuits and ground faults; increase acceleration time. |
| F3 | Overvoltage | DC bus voltage exceeds upper threshold limit. | Deceleration time too short during braking, regenerative energy from high-inertia load, mains surge voltage. | Increase deceleration time or install braking options if supported. |
| F4 | Undervoltage | DC bus voltage dropped below minimum operating limit. | Mains supply voltage too low, brownout, or phase loss on power input. | Check input mains line voltage and supply connection. |
| F5 | Drive Overload (I x t) | Thermal overload threshold reached for the motor/inverter combination. | Continuous operation above rated current, mechanical jam, or incorrect motor parameter settings. | Check motor current load, remove mechanical jam, reduce duty cycle, verify motor parameters. |
| F6 | Heatsink Overtemperature | Inverter heatsink temperature exceeded allowable limit. | Inadequate cooling, ambient temperature too high, clogged heatsink cooling fins, fan failure. | Improve enclosure ventilation, clean heatsink fins, check ambient operating temperature. |
| F7 | External Fault | External fault signal activated via assigned digital input. | External sensor, thermal switch, or interlock tripped. | Inspect external devices wired to the programmed digital input. |
| F8 | EPM Error / Memory Read Fault | Electronic Programmable Module (EPM) communication or read/write error. | EPM chip missing, corrupted, incorrect model type, or bad contact in socket. | Check that the EPM chip is securely seated in its slot; reprogram or replace the EPM chip if corrupted. |
| F9 | Overtemperature Warning / System Fault | Internal temperature limit exceeded or system pre-warning fault. | High ambient operating temperature or high drive duty cycle. | Allow drive to cool; check cabinet cooling system and operating current. |
| CF | Control Board / OEM Fault | Configuration parameter corrupt or OEM data mismatch. | Invalid parameter set or corrupt control memory. | Reset parameters to factory defaults or reload EPM chip parameters. |
| cEF | OEM EPM Data Fault | EPM chip parameter set incompatible with drive software revision. | EPM chip programmed with incompatible drive model data. | Use correct EPM chip or re-initialize drive settings using keypad default parameter loading. |
Frequently Asked Questions
How do I transfer drive parameters to a replacement Lenze 00469191?
Parameter data can be transferred by removing the blue EPM chip from the original drive and seating it into the replacement unit. Offline duplication is also possible using the optional Lenze EEPM1RA EPM Programmer.
What power input does the Lenze ESMD251X2SFA require?
The drive requires a single-phase 230 V AC mains input (operational from 170 to 264 V AC) and delivers a three-phase 230 V AC output for motors up to 0.25 kW (0.33 HP).
What does fault code F8 indicate on the keypad display?
Fault code F8 indicates an EPM memory read fault. Verify that the EPM chip is securely seated in its socket. If the error continues, reprogram or replace the EPM chip.
What mounting options are supported by this inverter?
The IP20 enclosure features a dual mounting layout supporting direct mounting onto standard 35 mm DIN rails or direct surface panel mounting inside an enclosure.
What is the recommended modern successor series for the AC Tech SMD drive line?
For control panel upgrades or modernizations, Lenze recommends migrating to the i510 Cabinet series, such as model i51AE125B1001000S.
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Data backup and recovery
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Specific firmware and hardware versions
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