Lenze 338120 8306 A.1M.23 – 8300 Series 15kW Frequency Inverter Drive
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Product Information
The Lenze 338120 is a 15 kW AC frequency inverter from the Lenze 8300 series, designated by model code 8306 A.1M.23. Designed for industrial speed and torque regulation in applications such as conveyors, pumps, fans, and automated material handling equipment, this drive operates on a 3-phase AC input supply ranging from 320 V AC to 528 V AC (400 V AC nominal). It delivers a rated output current of 32 A across an output frequency range of 0 to 480 Hz. Housed in an IP20 panel-mountable enclosure for control cabinet installation, the unit supports linear or quadratic V/f characteristic control as well as sensorless vector control, with adjustable switching frequencies up to 16 kHz to minimize acoustic motor noise.
Integrating a replacement drive into an operational machine requires aligning fieldbus hardware and drive configuration. The Lenze 338120 features a modular option slot that accommodates plug-in operating keypads, such as the 8201 or 2102 IB operating modules, as well as fieldbus adapters including LECOM RS232/RS485 (2102IB, 2111IB, 2112IB), PROFIBUS-DP (2131IB, 2133IB), and CANopen (2171IB, 2172IB). Operating parameters are stored in non-volatile internal EEPROM memory and can be copied to a replacement unit using a keypad module or Lenze Global Drive Control (GDC) PC software. Commissioning a spare unit involves transferring the parameter file, verifying motor rated current parameters, and setting matching fieldbus node addresses and bus termination. ABC Industrial Parts can assist maintenance teams with parameter extraction and donor unit matching when replacing damaged drives.
Drive status and troubleshooting are supported by front-panel LED indicators—DRV for drive operation, TRIP for fault conditions, and IMP for pulse inhibit status—alongside internal fault history registers accessible via an operating module or GDC software. Trip events cover key operational conditions, including output overcurrent or short circuits (OC1), deceleration overcurrent (OC2), motor overload (OC5), DC bus overvoltage (OU), DC bus undervoltage (LU), heatsink overtemperature (OH), motor thermal trips (OH4), and communication errors (CE0). Initial troubleshooting should confirm input power across main terminals L1, L2, and L3, motor cable integrity, external brake resistor wiring, cabinet cooling, and fieldbus module seating. Unrecoverable memory errors, such as EE0 EEPROM faults, point to internal hardware damage that cannot be resolved in the field, making a tested exchange unit or professional repair through ABC Industrial Parts the recommended solution.
Technical Specifications
| Manufacturer | Lenze |
| Part number | 338120 |
| Model / type | 8306 A.1M.23 |
| Product family | 8300 Series |
| Component type | Frequency Inverter Drive |
| Rated power | 15 kW |
| Nominal supply voltage | 400 V AC |
| Supply voltage range | 320 - 528 V AC |
| Rated output current | 32 A |
| Output frequency range | 0 - 480 Hz |
| Maximum switching frequency | 16 kHz |
| Control mode | V/f Characteristic & Sensorless Vector Control |
| Ingress protection rating | IP20 |
Programming and Configuration
The Lenze 338120 inverter drive relies on internal non-volatile EEPROM memory to retain all operating parameters across power cycles without requiring battery buffering. Drive parameterization can be performed locally using a plug-in keypad, such as the Lenze 8201 or 2102 IB operating module, or remotely over a serial interface using Lenze Global Drive Control (GDC) software.
Engineers can choose between V/f curve control and sensorless vector control depending on process requirements. Key configuration parameters include motor rated current, acceleration and deceleration ramp profiles, maximum switching frequency selection up to 16 kHz, and thermal monitoring parameters. Parameter sets can be cloned directly by copying the setup file from an active drive into GDC software or onto an operating keypad module, then uploading it to the replacement unit.
Communication and System Integration
System connectivity for the Lenze 338120 is provided through a modular interface slot located on the front of the drive. The unit supports point-to-point and multi-drop serial communication through LECOM RS232/RS485 modules (2102IB, 2111IB, 2112IB), enabling control and parameter management via GDC software or host systems.
For direct integration into automated fieldbus networks, the modular slot supports PROFIBUS-DP modules (2131IB, 2133IB) and CANopen system modules (2171IB, 2172IB). These modules allow central PLCs to transmit control words, update speed setpoints, and read drive status words in real time. Correct fieldbus operation requires proper module seating, correct node address switch setting, and proper bus termination resistors at network ends.
Diagnostics and Status Indication
The front panel of the Lenze 338120 contains three diagnostic LEDs that provide immediate visual feedback regarding drive status. The DRV LED indicates operational readiness, the TRIP LED alerts operators to a fault condition, and the IMP LED shows output pulse inhibit status.
Advanced diagnostics are available by querying the internal fault history register through an attached 8201/2102 IB operating keypad or via Lenze GDC software. Networked applications can also read the drive status word over PROFIBUS-DP, CANopen, or LECOM fieldbus interfaces to monitor fault flags remotely.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| DRV | Drive operation status indicator | |
| TRIP | Drive fault trip condition indicator | |
| IMP | Pulse inhibit / inverter output status indicator |
Replacement and Spare Part Considerations
When selecting a replacement for a Lenze 338120 (model 8306 A.1M.23), ensure that the power rating matches 15 kW and the continuous current rating matches 32 A. Verifying the input voltage range of 320 V AC to 528 V AC is essential to guarantee full compatibility with existing cabinet power distribution and protection devices.
Before installing a spare unit, swap the communication or operating module (such as PROFIBUS-DP, CANopen, or LECOM) from the existing drive to the spare unit. Download the stored parameter backup using Lenze GDC software or transfer the parameter set using an 8201 or 2102 IB operating keypad module. Importing an invalid or mismatched parameter set will cause a PR fault code, requiring a parameter reset and manual reconfiguration of motor current parameters.
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 acceleration current detected at output terminals. | Short circuit in motor cables or motor winding; acceleration ramp time set too short; motor undersized. | Check motor and wiring for short circuits; increase acceleration time parameter; check motor sizing. |
| OC2 | Overcurrent during Deceleration | Excessive motor current detected during deceleration phase. | Deceleration ramp time set too short; braking chopper or resistor defective/missing. | Increase deceleration time; verify external brake resistor connection and value. |
| OC5 | I x t Overload | Continuous motor or drive overcurrent condition (I x t thermal accumulation exceeded threshold). | Drive operated in continuous overload; mechanical blockage on motor shaft; excessive load. | Check mechanical load for binding; check process load profile; verify drive parameter settings for motor rated current. |
| OU | DC Bus Overvoltage | DC bus voltage exceeded safe maximum threshold. | Excessive regenerative energy during deceleration; deceleration ramp time too fast; brake chopper/resistor not functioning or absent. | Extend deceleration time; connect brake chopper / external brake resistor; check mains supply voltage level. |
| LU | DC Bus Undervoltage | DC bus voltage fell below minimum operation threshold. | Mains supply failure; phase loss; mains input voltage too low. | Check mains voltage supply and incoming fuses; verify line connections on terminals L1, L2, L3. |
| OH | Heatsink Overtemperature | Heatsink temperature exceeded internal maximum limit. | Insufficient cooling airflow; fan failure; ambient temperature too high; clogged heatsink fins. | Clean heatsink cooling fins; verify enclosure ventilation/fan operation; ensure ambient temperature is within specification. |
| OH4 | Motor Overtemperature | Motor thermal monitoring sensor activated (PTC thermistor or thermal contact). | Motor thermal overload; insufficient motor cooling; defective thermal sensor cable. | Allow motor to cool down; check motor cooling fan; inspect thermistor wiring to drive terminals. |
| CE0 | Communication Error | Communication breakdown between inverter control card and attached module or master system. | Loose or disconnected communication module; fieldbus timeout; bad cable connections. | Inspect attachment of LECOM / fieldbus module; check signal cabling and bus termination resistors. |
| EE0 | EEPROM Fault | Checksum or read/write error in non-volatile parameter memory. | Parameter memory corrupted during save or power cycle; internal hardware memory defect. | Reload factory default parameter set. Internal hardware fault if error persists — return unit for repair. |
| PR | Parameter Set Error | Invalid parameter set combination or error during parameter transfer. | Incompatible parameter file imported from different drive version or model size. | Re-initialize parameters to default values and re-configure motor parameters manually. |
Frequently Asked Questions
What software and hardware are used to transfer parameters to a replacement Lenze 338120?
Parameter sets can be downloaded and uploaded using Lenze Global Drive Control (GDC) PC software via a LECOM module (2102IB, 2111IB, or 2112IB). Alternatively, parameters can be copied directly using a plug-in 8201 or 2102 IB operating module keypad.
What communication interfaces are supported by the Lenze 338120 drive?
The Lenze 338120 supports LECOM RS232/RS485 modules (2102IB, 2111IB, 2112IB), PROFIBUS-DP fieldbus modules (2131IB, 2133IB), and CANopen system modules (2171IB, 2172IB) via its front interface option slot.
How do I resolve an OC1 fault on a Lenze 338120 inverter?
An OC1 fault indicates an overcurrent or short circuit during operation or acceleration. Check motor windings and field cabling for short circuits, extend the acceleration ramp time parameter, and verify that the motor size matches the drive output rating.
What does an EE0 fault code mean on the Lenze 338120?
An EE0 fault indicates an EEPROM memory checksum or read/write error. Attempt to reload factory default parameters. If the error persists after resetting, an internal memory hardware defect is present, requiring repair or unit replacement.
What control modes are available on the Lenze 338120?
The Lenze 338120 supports linear or quadratic V/f characteristic curve control as well as sensorless vector control for torque and speed regulation across an output frequency range of 0 to 480 Hz.
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