Lenze 333644 8103_E4G.12 8100 Series 1.5kW Frequency Inverter
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Product Information
The Lenze 333644 (model 8103_E4G.12) is a 1.5 kW 3-phase frequency inverter belonging to the Lenze 8100 Series, designed for speed and torque control of AC induction motors in industrial machinery. Operating from an AC supply voltage range of 360 to 528 V AC across 400V or 480V nominal power lines, this drive provides a continuous output current of 3.9 A with an adjustable output frequency ranging from 0 to 480 Hz. Utilizing field-proven V/f characteristic control, it can be configured for linear or quadratic speed profiles to suit constant or variable torque loads in material handling conveyors, ventilation fans, and pumps. A modular option slot located on the front panel accommodates plug-in keypads or communication interface modules.
Integrating the Lenze 333644 into an automation panel involves connecting four programmable digital inputs, one relay fault output, one 0–10V/0–20mA analog setpoint input, and one 0–10V analog monitoring output. Commissioning a replacement inverter requires transferring the application parameters from the existing unit so that acceleration ramps, current limits, and operational logic match the machine requirements. Parameter configuration can be uploaded and restored using a plug-in keypad module (such as the 2102IB or 33.8100 operating unit) or via Lenze Global Drive Control (GDC) software using LECOM RS232 or RS485 communication adapters. Technicians working with ABC Industrial Parts can utilize expert guidance for parameter extraction and configuration transfer when swapping legacy drives.
System diagnostic states and fault conditions are signaled through hardware indicators and communication channels. Front panel status LEDs provide rapid visual checks, including a solid green Ready LED during normal operational readiness and a red Fault LED that illuminates or flashes when a trip occurs. Internal monitoring continuously evaluates conditions such as acceleration overcurrent (E.OC1), DC bus overvoltage (E.OU), DC bus undervoltage (E.LU), and heatsink overtemperature (E.OH). While external issues like ramp timing or wiring faults can be corrected during field service, internal memory errors such as ROM fault (E.rO), RAM fault (E.rU), or internal interface failure (E.IF) indicate board-level component failure. When internal electronic faults arise, requesting a tested exchange unit or professional repair through ABC Industrial Parts provides the fastest path to restoring production line operation.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 333644 |
| Model / Type | 8103_E4G.12 |
| Product Family | 8100 Series |
| Component Type | Frequency Inverter |
| Rated Power | 1.5 kW |
| Nominal Supply Voltage | 400 / 480 V AC |
| Supply Voltage Range | 360 - 528 V AC |
| Continuous Output Current | 3.9 A |
| Output Voltage | 0 - 480 V AC |
| Output Frequency Range | 0 - 480 Hz |
| Switching Frequency | 8 kHz |
| Control Method | V/f Characteristic Control |
| Digital Inputs | 4 |
| Digital Outputs | 1 (Relay Fault Contact) |
| Analog Inputs | 1 (0-10V / 0-20mA) |
| Analog Outputs | 1 (0-10V) |
Programming and Configuration
Parameter setup for the Lenze 333644 drive inverter is conducted through the modular option slot located on the front of the unit. Local parameter adjustment is achieved by attaching a plug-in keypad module, such as the 2102IB Keypad Module or 33.8100 Operating Unit. This interface allows technicians to directly edit motor parameters, configure V/f characteristic curves, set acceleration/deceleration times, and adjust current limits without requiring an external computer.
For automated backup and multi-drive commissioning, parameter profiles can be managed using Lenze Global Drive Control (GDC) software. Connected via a serial LECOM interface adapter, GDC enables complete parameter extraction, offline editing, and parameter set download. Non-volatile onboard EEPROM memory preserves all customer configurations during power loss. If memory corruption occurs during write operations (indicated by fault E.EE), loading factory default settings and reloading the verified GDC configuration restores full operating parameters.
Communication and System Integration
The Lenze 8103_E4G.12 frequency inverter interfaces with central PLC networks through serial communication adapters installed in the front expansion slot. Network options include the LECOM-A RS232 module (2102IB / 2101IB), the LECOM-B RS485 module, and optical fiber interfaces. These modules allow higher-level automation systems to control drive run commands, monitor operating status, and dynamically update speed setpoints.
Correct system integration requires matching fieldbus address switches, baud rates, and serial settings between the drive and the network master. The drive continuously monitors communication status using an internal watchdog function. In the event of network wiring interruptions or serial protocol mismatches, the inverter generates a communication fault code (E.cF) and trips the internal fault relay output to secure connected machinery.
Diagnostics and Status Indication
Visual status indication on the Lenze 333644 consists of front panel LEDs that provide immediate feedback on operational readiness and drive trips. A green Ready LED remains continuously lit when the drive DC bus is charged and no fault conditions exist. A red Fault LED illuminates continuously or blinks when active trip thresholds are crossed.
Comprehensive trip identification is available by connecting a plug-in keypad module or by accessing the unit via Global Drive Control (GDC) software over LECOM. Diagnostic messages cover short circuits, overcurrent events (E.OC1, E.OC2, E.OC3), voltage limits (E.OU, E.LU), thermal overload conditions (E.OH, E.OH4), and internal hardware errors.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready LED | Green - Solid | Indicates drive operational readiness when lit continuously. |
| Fault LED | Red - Solid / Flashing | Indicates present fault or trip condition when illuminated or flashing. |
Replacement and Spare Part Considerations
The Lenze 333644 (model 8103_E4G.12) serves as a direct drop-in spare for existing 8100 series 1.5 kW drive installations. Because form factor, terminal position, and electrical ratings (3.9 A continuous output, 360–528 V AC supply input) are identical within the series, mechanical cabinet modifications are unnecessary during replacement.
Before placing a spare drive into active service, all operational parameters must be restored to match the original unit's settings. Swapping keypads or plugging in LECOM communication units allows parameter sets to be quickly downloaded from Global Drive Control (GDC) software backups. Verification of fieldbus address switches and baud rates is required if serial option cards are transferred to the replacement unit.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| E.OC1 | Short circuit / Overcurrent during acceleration | Output current threshold exceeded during motor acceleration phase. | Acceleration time set too short; motor cable short circuit or earth fault; defective motor winding. | Increase acceleration time (parameter); check motor and connecting cables for short circuit or earth fault. |
| E.OC2 | Short circuit / Overcurrent during deceleration | Output current threshold exceeded during motor deceleration phase. | Deceleration time set too short; generatoric energy feedback excessive. | Increase deceleration time or install braking resistor if applicable. |
| E.OC3 | Overcurrent during steady-state operation | Output current threshold exceeded during constant speed operation. | Sudden load surge; motor overload; mechanical jam. | Check mechanical drive train for jamming; verify load profile. |
| E.OU | DC bus overvoltage | DC bus intermediate circuit voltage exceeded upper limit. | Excessive kinetic feedback energy during deceleration; mains voltage transient. | Extend deceleration time; check supply voltage level; install brake chopper / resistor. |
| E.LU | DC bus undervoltage | DC bus intermediate circuit voltage dropped below minimum limit. | Mains supply voltage drop or failure; phase failure; blown input fuse. | Check supply voltage, input fuses, and power wiring connections. |
| E.OH | Heatsink overtemperature | Power section heatsink temperature reached maximum allowable limit. | Inadequate cooling; ambient temperature too high; clogged cooling fins / fan failure. | Clean cooling fins; ensure sufficient cabinet ventilation; check internal cooling fan if equipped. |
| E.OH4 | Motor overtemperature | Motor thermistor/PTC input detected excessive motor temperature. | Motor thermal overload; insufficient motor cooling; mechanical overload. | Allow motor to cool down; check load and thermal protection sensors. |
| E.rO | ROM fault | Internal firmware read-only memory error detected during self-test. | Internal electronic component failure; corrupted internal ROM. | Internal hardware failure — return unit for repair or replace inverter. |
| E.rU | RAM fault | Internal random-access memory error detected during self-test. | Internal memory error or hardware defect. | Internal hardware fault — return unit for repair or replace inverter. |
| E.EE | EEPROM parameter error | Checksum error or invalid data detected in parameter EEPROM memory. | Power failure during parameter write operation; memory corruption. | Load factory default parameters and reconfigure drive parameters. |
| E.cF | Communication timeout / LECOM fault | Communication failure or watchdog timeout on optional serial module. | Interrupted serial link cable; incorrect communication parameter settings. | Check serial connection cable, shielding, baud rate, and bus address settings. |
| E.IF | Internal interface fault | Communication loss between control board and power section. | Internal connection ribbon loose or damaged; control board fault. | Internal hardware failure — return unit for repair or replace drive. |
Frequently Asked Questions
How are parameter settings transferred to a replacement Lenze 333644 drive?
Parameters can be transferred using a plug-in keypad module (such as the 2102IB or 33.8100 unit) or via Lenze Global Drive Control (GDC) software connected through a LECOM RS232 or RS485 communication module.
What does an E.OC1 fault code mean on the 8103_E4G.12 inverter?
Fault E.OC1 indicates an overcurrent condition during motor acceleration. Common causes include overly aggressive acceleration ramp settings, motor winding damage, or a short circuit/earth fault in the motor cable.
What AC supply voltage range does the Lenze 333644 inverter require?
The drive operates on a 3-phase supply voltage ranging from 360 V AC to 528 V AC, making it compatible with nominal 400V and 480V AC industrial power networks.
What should be done if the inverter shows fault codes E.rO or E.rU?
Fault codes E.rO (ROM fault) and E.rU (RAM fault) indicate internal microelectronic memory failures. These board-level hardware defects cannot be repaired in the field and require replacing the inverter or sending it for unit repair.
Which communication modules can be plugged into the front option slot?
The option slot accepts LECOM-A RS232 modules (2102IB / 2101IB), LECOM-B RS485 modules, and optical fiber adapters for serial communication and fieldbus integration.
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