Lenze 8102E4G.12 8102E 4G.12 – 0.75 kW 8100 Series Frequency Inverter
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Product Information
The Lenze 8102E4G.12, also designated as model 8102E 4G.12, is a panel-mounted frequency inverter belonging to the Lenze 8100 series. Engineered for precision speed control of three-phase asynchronous motors in industrial automation systems, this 0.75 kW drive operates on a 3-phase 400V AC input voltage range of 320V to 528V AC. It produces an output frequency range of 0 to 480 Hz with a rated output current of 2.4A and an overload capacity reaching 3.6A (150% for 60 seconds). Utilizing configurable linear or quadratic V/f characteristic control, the drive is widely applied in speed regulation for pumps, ventilation fans, conveyors, and general mechanical machinery.
For operational integration, the unit includes standard control terminals featuring four programmable 24V DC digital inputs, one digital output, one setpoint analog input (0-10V or 0-20mA), and one 0-10V analog output. A modular expansion slot allows the installation of optional plug-in communication modules, including LECOM-A RS232 (2101IB), LECOM-B RS485 (2102IB), PROFIBUS-DP (2131IB / 2133IB), and CANopen (2171IB / 2172IB). Replacing an existing unit in an active production environment requires transferring parameter datasets to the new drive, as parameter mismatch will prevent correct motor operation. Parameter cloning can be completed using the optional Lenze Operating Keypad 8201BB or via PC using Lenze Global Drive Control (GDC) software v4.x, with non-volatile backup stored in onboard EEPROM memory. ABC Industrial Parts can assist maintenance teams with parameter extraction from donor units or backup files to simplify commissioning.
System status is communicated through onboard LED indicators, where a solid green LED indicates an enabled, active drive and a flashing green LED indicates readiness. Fault conditions trigger a solid or flashing red trip LED, alongside detailed 7-segment error codes on the optional operating keypad or diagnostic entries in the LECOM/GDC fault register. Standard first-line troubleshooting involves checking input supply lines (L1, L2, L3) for phase loss or undervoltage, measuring motor winding insulation for ground faults (OC5) or short circuits (OC1), and confirming fieldbus cable integrity and termination resistors (CE0/CE1). If persistent red trip indications or internal EEPROM faults (EE) occur that cannot be cleared through parameter resets, internal hardware damage is indicated. In these instances, hardware repairs are not field-serviceable, and sourcing a fully tested replacement or repair service through ABC Industrial Parts provides a fast route back to production.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 8102E4G.12 |
| Model / Type | 8102E 4G.12 |
| Product Family | Lenze 8100 |
| Component Type | Frequency Inverter |
| Rated Power | 0.75 kW |
| Supply Voltage Range | 400 V AC (320 V AC to 528 V AC) |
| Rated Output Current | 2.4 A |
| Maximum Output Current | 3.6 A (150% overload for 60 seconds) |
| Output Frequency Range | 0 Hz to 480 Hz |
| Switching Frequency | 8 kHz |
| Control Method | V/f Characteristic Control (Linear / Quadratic) |
| Digital Inputs | 4 (24 V DC) |
| Digital Outputs | 1 |
| Analog Inputs | 1 (0-10 V / 0-20 mA) |
| Analog Outputs | 1 (0-10 V) |
Programming and Configuration
Configuring the Lenze 8102E4G.12 drive is accomplished either via the optional Lenze Operating Keypad 8201BB or through Lenze Global Drive Control (GDC) software version 4.x. The operating keypad plugs directly into the front panel slot, providing a 7-segment display and keypad interface to modify parameters, store complete parameter sets, and monitor operational parameters in real time.
When using PC-based engineering tools, connection is established through LECOM communication adapters such as the RS232 module (2101IB) or RS485 module (2102IB). GDC v4.x software enables online diagnostic monitoring, graphical parameter adjustment, parameter archiving to disk, and parameter transfer across multiple drives. All configured drive settings are committed to non-volatile EEPROM memory, ensuring full data retention through power cycles.
Communication and System Integration
The Lenze 8102E4G.12 features integrated I/O terminals alongside a modular interface slot for fieldbus integration. The onboard terminal strip provides four 24V DC digital inputs for run commands and interlocks, one digital output, one configurable analog input accepting 0-10V or 0-20mA speed setpoints, and one 0-10V analog signal output for actual speed feedback.
Network connection to higher-level PLC architectures is made possible by inserting specialized plug-in communication modules into the dedicated option slot. Supported options include PROFIBUS-DP modules (2131IB and 2133IB) and CANopen modules (2171IB and 2172IB) for fast cyclical process data transfer. Serial communication is supported using LECOM-A (RS232, 2101IB) or LECOM-B (RS485, 2102IB) interfaces, allowing flexible fieldbus integration based on the existing network infrastructure.
Diagnostics and Status Indication
Operational state and error conditions on the Lenze 8102E4G.12 are monitored via front-panel LED indicators, an optional plug-in keypad, or network diagnostics. The onboard LEDs provide immediate visual feedback regarding drive enable status and trip conditions, allowing quick preliminary inspection without external tools.
Detailed fault identification is provided by 7-segment fault code readouts on the 8201BB operating keypad or by reading out the fault history register over LECOM serial networks using GDC software. System technicians can also verify digital input states and relay output status directly through the software or keypad diagnostic parameters.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Green LED (Operation / Ready) | Green - Solid / Flashing | Solid Green = Drive enabled and running; Flashing Green = Drive ready, disabled / inhibited |
| Red LED (Trip / Fault) | Red - Solid / Flashing | Red ON / flashing = Active fault condition present (Trip). Persistent red indicates internal hardware error |
Replacement and Spare Part Considerations
Replacing a failed Lenze 8102E4G.12 drive requires matching physical ratings, power specifications, and parameter configurations. The replacement unit must match the 0.75 kW power rating and 400V 3-phase supply requirements. Before powering on the replacement drive, all motor parameters, control modes (linear or quadratic V/f), acceleration ramps, and terminal configurations must be transferred from the original unit using the plug-in keypad or GDC software v4.x.
Because the Lenze 8100 series has been discontinued by the manufacturer, facilities planning long-term upgrades or immediate replacement can evaluate direct replacement options within newer Lenze product lines. Compatible migration paths include the Lenze 8200 vector series (specifically model E82EV751K4B) or the Lenze i550 cabinet drive series (model i55AE175F100). When transitioning to newer drive series, control wiring, fieldbus configuration files, and parameter structures must be adapted accordingly.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| OC1 | Short Circuit / Overcurrent | Short circuit or excessive current on motor output terminals. | Short circuit in motor cable or motor winding, ground fault, acceleration time set too short. | Check motor and wiring for short circuit or earth fault, increase acceleration time, verify motor power rating. |
| OC5 | Ground Fault / Earth Fault | Earth fault detection on motor output phases. | Ground insulation failure in motor cable or motor, excessive cable length capacitance. | Check insulation resistance of motor cable and motor windings; check output filter if long cables used. |
| OU | Overvoltage DC Bus | Intermediate circuit DC bus voltage exceeds upper threshold. | Deceleration ramp too short, regenerative energy from motor, mains overvoltage. | Extend deceleration time, fit braking chopper/resistor, verify mains supply voltage. |
| LU | Undervoltage DC Bus | DC bus voltage dropped below minimum operating limit. | Mains supply failure, voltage drop on line supply, main fuse blown. | Check mains voltage, verify line fuses and main contactor. |
| OH | Heatsink Overtemperature | Heatsink temperature exceeds permissible limit. | Inadequate ventilation, fan failure, ambient temperature too high, severe overload. | Clean heatsink cooling fins, check control cabinet fan/ventilation, reduce load. |
| OL1 | Motor Overload (I2t) | Calculated motor thermal overload exceeded limit. | Continuous operation above rated current, motor stalled or mechanically jammed. | Check mechanical load and motor sizing, verify motor current parameters set correctly. |
| EE | EEPROM Fault | Internal EEPROM memory checksum error or transfer failure. | Corrupted non-volatile parameter memory, power failure during write operation, hardware EEPROM failure. | Reset unit to factory default parameters and reconfigure. Internal hardware failure — if fault persists, replace the drive. |
| CE0 | Communication Error LECOM | Communication failure or time-out on LECOM interface. | Loose connector, incorrect baud rate, broken communication cable, master unit stopped sending data. | Check LECOM cable connection, check master station and baud rate settings. |
| CE1 | Communication Error Fieldbus | Time-out or loss of cyclical process data on optional fieldbus module. | Fieldbus module missing or disconnected, bus cable interrupted, PLC offline. | Check fieldbus cabling, bus termination resistors, fieldbus module seating and PLC status. |
| LP | Phase Loss Failure | Mains supply phase failure detected. | One mains supply phase missing, severe phase imbalance, supply fuse blown. | Check mains voltage across all 3 input phases (L1, L2, L3) and check line fuses. |
| Er | General Fault / Parameter Error | Invalid parameter combination or internal processing fault. | Inconsistent parameter settings or firmware execution fault. | Check parameter settings, restore factory setting defaults. Internal hardware fault if error persists. |
Frequently Asked Questions
What software is used to program the Lenze 8102E4G.12 frequency inverter?
Lenze Global Drive Control (GDC) software v4.x is used to program and diagnose the 8102E4G.12 inverter when connected via a LECOM RS232 (2101IB) or RS485 (2102IB) module. Alternatively, parameters can be set directly using the plug-in Lenze Operating Keypad 8201BB.
How can parameter settings be cloned to a replacement Lenze 8102E4G.12 unit?
Parameters can be uploaded from the original drive to the 8201BB keypad or to a PC running GDC v4.x software, then downloaded into the spare drive. Non-volatile EEPROM memory retains the parameter set once copied.
What does fault code OC1 indicate on the Lenze 8102E4G.12?
Fault code OC1 indicates an overcurrent or short circuit on the motor output terminals. This can be caused by a shorted motor cable, defective motor windings, a ground fault, or an excessively short acceleration time setting.
What optional fieldbus communication modules are supported by the 8100 series?
The 8102E4G.12 accepts plug-in option modules into its interface slot, supporting PROFIBUS-DP (2131IB / 2133IB), CANopen (2171IB / 2172IB), and LECOM RS232/RS485 modules (2101IB / 2102IB).
What are the modern successor models for the Lenze 8102E4G.12 drive?
Direct modern replacement options include the Lenze 8200 vector series (model E82EV751K4B) and the Lenze i550 cabinet drive series (model i55AE175F100).
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