Lenze 7818E 329174 – 7800 Series 11kW AC Frequency Inverter
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Product Information
The Lenze 7818E (type designation 329174) is an 11 kW AC frequency inverter from the Lenze 7800 Series, designed for precise speed and torque control of 3-phase asynchronous AC induction motors. Operating across a 3-phase mains supply voltage range of 380 V AC to 480 V AC, this drive supplies up to 24 A continuous output current with an output frequency range from 0 Hz to 480 Hz. It supports selectable control profiles, including linear and quadratic V/f characteristic curves as well as sensorless vector control, making it suitable for industrial machinery, packaging equipment, conveying lines, pumps, and ventilation fans.
For system integration and replacement, the drive features built-in screw terminal controls for standard I/O reference signals, along with optional fieldbus communication modules for LECOM, PROFIBUS-DP, and CANopen networks. Commissioning a replacement unit requires transferring the parameter configuration from the existing drive using the pluggable 7800 operating keypad or Lenze Global Drive Control (GDC) PC software. Because an off-the-shelf replacement drive will not operate correctly until motor parameters, speed profiles, and fieldbus settings match the original equipment setup, careful configuration cloning is essential before putting a spare unit into service. ABC Industrial Parts can support maintenance teams with tested replacement units and configuration transfer requirements.
Diagnostic information is provided through the front panel DRIVE / TRIP LED indicator, which displays green for normal operational status and red during fault conditions. Detailed status monitoring and error history tracking are accessible via the pluggable keypad module or the GDC software diagnostic monitor, alongside a dedicated fault relay contact trip output. When facing persistent drive faults, initial troubleshooting should include verifying all 3-phase input supply connections, motor cabling insulation, and cooling fan operation. In cases involving internal hardware failures or unresolvable EEPROM corruption, internal board repairs are not field-serviceable, making a tested exchange unit from ABC Industrial Parts a practical option to restore production.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 7818E |
| Model / Type | 329174 |
| Product Family | 7800 Series |
| Component Type | AC Frequency Inverter |
| Rated Power | 11 kW |
| Continuous Output Current | 24 A |
| Supply Voltage Range | 380 V AC - 480 V AC |
| Supply Phase | 3-phase |
| Output Frequency Range | 0 - 480 Hz |
| Control Method | V/f linear / quadratic profile and sensorless vector control |
Programming and Configuration
The Lenze 7818E inverter drive uses the pluggable Lenze 7800 series keypad module or Lenze Global Drive Control (GDC) PC software for drive setup, tuning, and parameter management. Operating profiles can be set to simple linear or quadratic V/f control for basic pump and fan applications, or configured for sensorless vector control for demanding variable torque and high-dynamic material handling lines.
Parameter sets can be saved and cloned using the pluggable keypad memory or stored electronically via GDC PC software. When replacing a failed unit, transferring the parameter set directly from the original keypad or backed-up software files into the spare drive ensures that speed reference limits, acceleration ramps, thermal motor protection settings, and network addresses are accurately preserved without manual re-entry.
Communication and System Integration
The Lenze 7818E drive is equipped with standard screw terminals for direct hardwired control, accepting digital and analog reference signals for start/stop, direction, and speed commands.
For networked automation systems, the drive supports pluggable optional fieldbus communication modules. Installing the appropriate module enables seamless integration into LECOM, PROFIBUS-DP, or CANopen fieldbus networks, allowing real-time speed setpoint adjustments, run commands, and diagnostic monitoring from a central PLC or master controller.
Diagnostics and Status Indication
The Lenze 7818E includes an integrated dual-color DRIVE / TRIP LED on the drive front panel. Green illumination signals normal operational readiness, while red indicates a warning or trip condition.
For detailed diagnostic analysis, technicians can view real-time status parameters and active fault codes using the pluggable keypad display or the diagnostic monitor within Lenze Global Drive Control (GDC) software. The drive maintains an internal fault history register and features a hardware fault relay output to trigger external alarm circuits upon a drive trip.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| DRIVE / TRIP LED | Green / Red - Green = Operation / Ready, Red = Fault / Trip | Indicates drive operational state, warning, or trip condition |
Replacement and Spare Part Considerations
When substituting a Lenze 7818E (type 329174) in an existing installation, match both the part number 7818E and model code 329174 to ensure full electrical and functional compatibility. The drive requires a 380 V AC to 480 V AC 3-phase input and delivers a 24 A continuous output rating for 11 kW induction motors.
Prior to powering up the replacement drive, ensure that all mains supply phases (L1, L2, L3) and motor leads are properly connected and phase balance is verified. Transfer the full parameter backup from the old drive via the pluggable 7800 keypad or GDC software to restore motor settings, protection thresholds, and optional fieldbus card configurations before putting the system back into production.
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 | Instantaneous overcurrent detected during acceleration or operation. | Short circuit at output terminals, motor winding fault, cable short circuit, acceleration ramp time too short. | Check motor wiring and motor windings for insulation fault/short circuit. Increase acceleration time. Check for internal power module damage. |
| OC2 | Earth Fault | Earth leakage current exceeded safety threshold. | Ground fault in motor lead or motor winding, ground short in cable. | Measure insulation resistance of motor and power cables. Check cable insulation for mechanical damage. |
| OC3 | Overcurrent Acceleration | Excessive motor current during acceleration ramp. | Acceleration time too short, motor load too heavy, incorrect V/f settings. | Increase acceleration time (Tacc), adjust current limit or V/f characteristic. |
| OC4 | Overcurrent Constant Speed | Excessive motor current during constant speed run. | Sudden load impulse, mechanical blockage in load, motor overload. | Check mechanical drive train for binding or overload conditions. |
| OC5 | Overcurrent Deceleration | Excessive current during deceleration ramp. | Deceleration time too short, high load inertia. | Increase deceleration time (Tdec) or install brake module/resistor. |
| OU | DC Bus Overvoltage | DC bus voltage exceeded upper threshold. | Excessive regenerative energy from motor during deceleration, deceleration time too short, brake chopper/resistor not functioning or missing. | Extend deceleration time, connect external brake resistor, check braking transistor circuit. |
| LU | DC Bus Undervoltage | DC bus voltage fell below lower limit threshold. | Mains voltage drop or failure, blown input fuse, transient power outage. | Check mains voltage supply levels, inspect fuses and main contactor. |
| OH | Heatsink Overtemperature | Drive heatsink temperature exceeded allowable operating limit. | Cooling fan failed or blocked, excessive ambient temperature, clogged heatsink cooling fins, drive overloaded. | Clean heatsink, ensure adequate cabinet ventilation, verify cooling fan operation. |
| OH3 | Motor Overtemperature (PTC) | Motor thermistor/PTC sensor reported thermal overload. | Motor thermal overload, cooling fan failure on motor, heavy low-speed operation. | Allow motor to cool down, inspect motor load and motor cooling fan, check PTC connection. |
| OH4 | Drive Internal Temperature High | Internal cabinet/board temperature exceeded limit. | Cabinet ambient temperature too high, enclosure ventilation failure. | Reduce ambient temperature in control cabinet, check cabinet fans. |
| OL1 | Drive Overload (I*t) | Inverter thermal overload current integral reached limit. | Continuous current output above rated limit, undersized drive for application. | Check motor current against rated inverter current, reduce load or upsize inverter. |
| OL2 | Motor Overload (I*t) | Calculated motor thermal overload limit reached. | Motor run above rated torque for prolonged period. | Check mechanical load and motor rated current parameter settings. |
| CE0 | Communication Fault | Loss of communication on optional serial / fieldbus interface. | Loose cable, incorrect baud rate, master controller offline, noise/interference. | Check fieldbus cabling, termination resistors, and master controller status. |
| EE | EEPROM Fault | Internal EEPROM checksum or write error detected. | Internal memory corruption or hardware board-level memory failure. | Perform factory default reset. If fault persists, internal hardware fault exists — unit requires service or replacement. |
| LP | Mains Phase Loss | Loss of one incoming mains AC supply phase. | Blown input line fuse, phase imbalance, loose mains terminal. | Check 3-phase AC input supply voltage across all terminals (L1, L2, L3) and fuses. |
| Pr | Parameter Error | Inconsistent parameter settings or corrupted parameter set. | Invalid parameter combination set during commissioning or transfer error. | Reload parameter set or reset drive parameters to factory default. |
Frequently Asked Questions
How do I transfer parameters to a replacement Lenze 7818E drive?
Parameters can be transferred using the pluggable 7800 series operating keypad or via PC using Lenze Global Drive Control (GDC) software. Parameter cloning allows you to copy the saved parameter set from the existing drive and restore it directly to the replacement unit.
What input voltage and current rating does the Lenze 7818E require?
The Lenze 7818E operates on a 3-phase supply voltage ranging from 380 V AC to 480 V AC, providing an 11 kW power output with a continuous rated current of 24 A.
Which fieldbus communication protocols are supported by the 7818E drive?
The drive supports optional pluggable communication modules for LECOM, PROFIBUS-DP, and CANopen networks, in addition to its standard screw terminal hardwired control interfaces.
What does the red DRIVE / TRIP LED indicate on the front panel?
A red DRIVE / TRIP LED indicates an active fault or trip condition on the drive. Detailed fault codes can be identified using the pluggable keypad module or through Lenze GDC software.
What steps should be taken if the drive displays an EE fault code?
An EE fault code indicates an EEPROM checksum or write error. Perform a factory default reset. If the error persists, an internal board-level hardware failure exists, requiring drive repair or unit replacement.
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