Lenze 333072 8306.E.1N.23 – 8300 Vector 4.0kW Frequency Inverter
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Product Information
The Lenze 333072 (Model 8306.E.1N.23) is a 4.0 kW frequency inverter from the Lenze 8300 Vector family, engineered for variable speed and torque control of three-phase asynchronous AC motors. Designed for panel mounting with an IP20 protection rating, this compact drive operates across an incoming supply voltage range of 320 V AC to 528 V AC. It delivers a rated continuous output current of 9.5 A with an output voltage range from 0 to 400 V AC and output frequencies up to 480 Hz. Featuring an overload current capacity of 14.3 A for up to 60 seconds, the drive maintains steady dynamic performance under heavy load changes in applications such as material handling conveyors, industrial pumps, ventilation fans, and packaging equipment. Control methods include configurable linear or quadratic V/f characteristic control, sensorless vector control, and closed-loop vector control.
System integration and local operation rely on a modular front option slot designed for interchangeable operating keypads and communication adapters. Plug-in keypads including the Lenze 8201, XT, and EMZ2101 enable direct parameter monitoring, local speed adjustment, and configuration cloning. For networked control, the drive accepts PROFIBUS modules (2131IB / 2133IB), CANopen modules (2172IB / 2173IB), and LECOM RS232 / RS485 serial adapters. Commissioning a replacement unit requires configuring parameters to match the specific motor map and machine sequence. Up to four independent parameter configurations can be stored in non-volatile internal EEPROM memory, allowing quick parameter transfer via keypad cloning or through Lenze Global Drive Control (GDC) PC software. ABC Industrial Parts can assist maintenance teams with spare units and parameter transfer support to minimize machine downtime.
Drive operation and diagnostic status are indicated by dual front-panel LEDs alongside detailed code reporting on attached keypads or PC interfaces. Green and red LEDs provide immediate feedback on operational readiness and trip conditions. Advanced diagnostics—including Trip code displays, active status registers, and an internal fault buffer recording recent trip events—are accessible using an 8201 or XT keypad or GDC software over LECOM and fieldbus links. Initial troubleshooting should include checking line supply voltages, verifying motor wiring for short circuits or earth faults, checking dynamic braking resistor integrity, and inspecting cabinet cooling ventilation. Hardware-level errors such as EEPROM checksum faults (EE0, EEr), internal heatsink sensor faults (OH4), or microcontroller self-test failures (H05) are not field serviceable, making tested exchange units or repair through ABC Industrial Parts the most reliable path back to full operation.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 333072 |
| Model / Type | 8306.E.1N.23 |
| Product Family | 8300 Vector |
| Component Type | Frequency Inverter |
| Rated Power | 4.0 kW |
| Supply Voltage Range | 320 - 528 V AC |
| Rated Output Current | 9.5 A |
| Max Peak Output Current | 14.3 A (for 60 s) |
| Output Voltage Range | 0 - 400 V AC |
| Output Frequency Range | 0 - 480 Hz |
| Default Switching Frequency | 8 kHz |
| Control Modes | V/f characteristic control, Sensorless Vector Control, Closed-loop Vector Control |
| Ingress Protection Rating | IP20 |
Programming and Configuration
Parameterization of the Lenze 333072 frequency inverter is performed either locally using plug-in operating keypads or remotely via PC software. The front-mounted modular option slot accepts keypads such as the Lenze 8201, XT, or EMZ2101. These keypads provide immediate access to operating parameters, error logs, and control overrides directly at the panel front.
For PC-based configuration and monitoring, Lenze Global Drive Control (GDC) software connects to the unit using a serial or fieldbus interface adapter. Non-volatile internal EEPROM memory stores up to four complete, independent parameter profiles. Key parameters include acceleration ramp time (C0012), deceleration ramp time (C0013), and maximum motor speed limit (C0011). Parameter cloning via keypad memory transfer or GDC file backup allows quick replication of settings during device commissioning or emergency swap-outs.
Communication and System Integration
The Lenze 8300 Vector architecture incorporates a flexible option slot that supports interchangeable fieldbus and serial communication modules. To integrate with centralized automation systems, the unit accepts PROFIBUS-DP modules (2131IB and 2133IB), CANopen modules (2172IB and 2173IB), and INTERBUS communication interfaces.
Serial point-to-point communication is supported through LECOM RS232 and RS485 adapters, allowing direct connection to higher-level controllers or commissioning laptops running GDC software. Master controllers interact with the drive through LECOM status registers to command start/stop functions, adjust speed setpoints, and monitor operating status. Loss of fieldbus activity is actively detected, triggering a CE0 communication time-out fault to prevent uncoordinated machine operation.
Diagnostics and Status Indication
Visual status monitoring on the front of the inverter is provided by two LEDs. The green LED indicates ready and operational status, illuminating solid or flashing depending on drive activity. The red LED signals trip and fault conditions, turning solid or flashing when internal safety thresholds or external faults occur.
In-depth diagnostic information is delivered via 7-segment or clear-text Trip code displays on pluggable keypads (8201 or XT), live status register readouts in GDC software, and an internal fault buffer recording recent trip events. Programmable digital outputs on the drive terminal strip can also be configured to report TRIP or Ready signals directly to supervisory control circuits.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready / Operation | Green - Solid / Flashing | Inverter is operational or ready for operation |
| Fault / Trip | Red - Solid / Flashing | Fault condition detected, drive tripped |
Replacement and Spare Part Considerations
When selecting a replacement for a Lenze 333072 (Model 8306.E.1N.23) drive, verify that the application electrical specifications match: 4.0 kW continuous rated output, 9.5 A rated output current, and 320 V to 528 V AC input supply. Physical layout and panel mounting clearances must also be confirmed to ensure adequate cabinet airflow around the drive heatsink.
Before applying power to a spare unit, parameter configurations must be loaded into the drive's non-volatile EEPROM. Parameters can be copied directly from an operational donor unit using a plug-in 8201/XT keypad or downloaded from a saved GDC software project file. Additionally, installed front-slot option modules—such as PROFIBUS 2131IB/2133IB or CANopen 2172IB/2173IB adapters—must be transferred to the replacement unit, ensuring node addresses and network switch settings match original cabinet wiring.
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 / Earth fault | Short circuit or earth fault on output motor terminals during acceleration | Motor cable short circuit, winding earth fault in motor, line capacitance too high, acceleration time set too short | Check motor and motor cables for insulation and short circuit; increase acceleration ramp time C0012. |
| OC2 | Overcurrent during deceleration | Output current limit exceeded while decelerating motor | Deceleration time too short, motor regenerated energy too rapid, braking resistor missing or defective | Increase deceleration ramp time C0013 or connect dynamic braking chopper/resistor. |
| OC3 | Overcurrent in constant operation | Output current threshold exceeded during steady-state constant speed operation | Sudden mechanical load change, mechanical jam/stalling, severe motor overload | Check mechanical drive train for stiffness, jam, or sudden load changes. |
| OC5 | Inverter Overload (I x t) | I x t thermal monitoring of frequency inverter power stage triggered | Drive continuously operated above rated current for prolonged duration | Reduce mechanical load or replace inverter with larger power class. |
| OC6 | Motor Overload (I2t) | I2t motor protection function tripped | Motor operating continuously at low speed under high load without forced cooling | Check motor loading; adjust motor I2t monitoring parameters or add external cooling fan. |
| OU | Overvoltage DC bus | DC bus circuit voltage exceeded upper safety threshold (approx. 770 V DC) | Excessive motor regenerative energy backfed into DC bus during deceleration; mains input voltage too high | Increase deceleration ramp time C0013, install dynamic braking resistor, check mains supply voltage. |
| LU | Undervoltage DC bus | DC bus voltage fell below lower safety limit (approx. 400 V DC on 400V units) | Mains voltage failure, input power phase loss, mains voltage dip under load | Check AC mains line voltage, fuses, and supply switching hardware. |
| OH | Heatsink Overheating | Inverter heatsink temperature exceeds maximum allowable threshold | Inadequate control cabinet ventilation, dirty heatsink cooling fins, internal fan failure | Clean heatsink, ensure minimum enclosure clearance, verify cabinet cooling fan operation. |
| OH4 | Heatsink Sensor Fault | Internal heatsink thermal sensor wire broken or short-circuited | Internal temperature sensor failure or board interconnect fault | Internal hardware fault — return unit for repair or replace inverter. |
| OH7 | Motor Thermal Sensor Trip | Motor PTC or thermal contact connected to terminals T1/T2 tripped | Motor overheating due to excessive mechanical load, low-speed operation, or cooling fan fault | Allow motor to cool, verify thermal sensor wiring, inspect motor cooling system. |
| LP1 | Mains Phase Loss | Phase failure detected on incoming 3-phase AC mains supply | One phase missing from supply network, blown input line fuse | Check mains line supply voltages and input fuses. |
| EE0 | EEPROM Checksum Error | Parameter memory corrupted or EEPROM read error detected during power-up | Electrical noise during write operation, damaged internal EEPROM chip | Reload factory defaults or re-download parameters. If fault persists: internal hardware fault — replace unit. |
| EEr | EEPROM Write Fault | Parameter write procedure to non-volatile EEPROM failed | Internal EEPROM wear out or memory hardware error | Retry writing parameters. If fault persists: internal hardware failure — return unit for repair. |
| H05 | Internal Hardware Fault | Internal control board self-test failure detected | Internal micro-controller hardware failure or power supply supply rail error | Internal hardware fault — return unit for repair or replace drive. |
| CE0 | Communication Time-Out | Interruption in serial / fieldbus communication to master controller | Loose fieldbus connector, broken serial cable, PLC master stopped | Check fieldbus wiring, terminal connection, module attachment, and master PLC status. |
| Pr | Program Exception Error | Internal microprocessor system fault or program execution error | Severe EMI/RFI noise, internal logic board failure | Power cycle unit. Verify grounding/shielding. If error reoccurs: return unit for repair. |
| NMAX | Max Speed Exceeded | Motor actual speed exceeded maximum limit parameter C0011 | Incorrect feedback setup, active overhauling load driving motor | Verify speed scaling, encoder setup, and mechanical overhauling load torque. |
Frequently Asked Questions
What software and keypads are compatible with the Lenze 333072 frequency inverter?
The drive can be programmed locally using Lenze Operating Keypads including the 8201, XT, or EMZ2101 models attached to the front option slot. Remote parameterization, status monitoring, and project backups are performed using Lenze Global Drive Control (GDC) PC software via a LECOM adapter.
How can parameter settings be transferred when replacing a Lenze 8306.E.1N.23 drive?
Parameters stored in the drive's EEPROM memory can be copied using a plug-in 8201 or XT keypad parameter cloning function, or uploaded/downloaded using Lenze Global Drive Control (GDC) PC software connected through a LECOM serial or fieldbus interface.
What causes an OU overvoltage fault on this drive?
An OU fault triggers when the DC bus voltage exceeds approximately 770 V DC. This occurs when high motor regenerative energy backfeds during rapid deceleration or if mains input voltage is too high. Extending the deceleration ramp time (C0013) or connecting a dynamic braking resistor typically resolves the condition.
Which fieldbus networks can be integrated with the Lenze 8300 Vector inverter?
The drive supports plug-in fieldbus option modules attached to the front expansion slot, including PROFIBUS-DP (modules 2131IB / 2133IB), CANopen (modules 2172IB / 2173IB), INTERBUS, and LECOM RS232 / RS485 serial communication adapters.
What should be done if an EE0, EEr, or H05 error code is displayed?
EE0 indicates memory checksum corruption, EEr indicates an EEPROM write failure, and H05 indicates an internal control board hardware fault. First attempt to restore factory defaults or re-download the parameter file. If the fault persists, an internal hardware failure has occurred requiring drive repair or unit replacement.
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