Lenze 8104_E.5B.21 8104 E Frequency Inverter
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Product Information
The Lenze 8104_E.5B.21 is a compact frequency inverter from the Lenze 8100 series, designed to provide adjustable speed control for standard 4-pole three-phase AC motors up to 0.75 kW (1.0 HP). Operating across a 230 V class supply range from 180 V to 264 V AC on single-phase or three-phase lines, this drive outputs up to 4.0 A continuous current with an 8 kHz switching frequency. It delivers variable frequency output from 0 to 480 Hz using linear or quadratic V/f characteristic curves, making it suitable for applications such as conveyor speed regulation in packaging machinery, variable rate flow control in small centrifugal pumps and blowers, and speed adjustment for industrial mixers and material feeds.
Control integration is handled via onboard screw terminal connections for hardwired system wiring. The unit accepts analog setpoint signals (0–10 V DC or 0/4–20 mA) alongside programmable digital inputs for run commands and direction selection, plus a failure status relay contact for fault signaling to a host controller. When commissioning a spare drive, parameter settings stored in non-volatile EEPROM memory must be copied to the replacement unit. Configuration and parameter cloning can be accomplished using the optional plug-in EMZ2102 operating keypad module or via Lenze Global Drive Control (GDC) PC software using LECOM RS232 or RS485 communication adapters. ABC Industrial Parts can assist maintenance teams with parameter extraction and drive preparation during replacement procedures.
Diagnostic monitoring is facilitated by an onboard bi-color status LED, where green indicates normal operation, red indicates an active trip or fault, and an unlit LED signifies a missing supply voltage or power supply issue. Specific diagnostic trip details can be retrieved using an EMZ2102 keypad display or by checking the error history register through GDC software. Standard monitored fault conditions include output short circuits (OC1), overcurrent during acceleration or deceleration (OC2, OC5), DC bus overvoltage or undervoltage (OU, LU), heatsink thermal limits (OH), motor thermistor trips (OH4), and EEPROM parameter corruption (EE). Internal power stage defects or unrecoverable memory faults are not field-serviceable; ABC Industrial Parts offers tested replacement units and repair options to help restore system operation efficiently.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 8104_E.5B.21 |
| Model / Type | 8104 E |
| Product Family | Lenze 8100 |
| Component Type | Frequency Inverter |
| Supply Voltage Range | 180 - 264 V AC |
| Mains Phase | 1-Phase / 3-Phase |
| Rated Output Current | 4.0 A |
| Output Voltage Range | 0 - 230 V AC |
| Rated Motor Power | 0.75 kW |
| Output Frequency Range | 0 - 480 Hz |
| Control Method | Linear / Quadratic V/f Characteristic Control |
Programming and Configuration
Drive configuration on the Lenze 8104_E.5B.21 is retained within onboard non-volatile EEPROM memory. Parameters defining acceleration and deceleration ramps, V/f characteristic curves, motor voltage limits, and control terminal functions are retained even during extended power disruptions. Fast parameter cloning enables maintenance personnel to transfer saved settings directly to spare units, minimizing operational downtime during component replacements.
Parameter entry and backup can be performed using the optional Lenze EMZ2102 operating keypad module connected directly to the front interface. Alternatively, engineering teams can utilize Lenze Global Drive Control (GDC) software running on a PC. Connecting the PC through a Lenze LECOM RS232 or RS485 communication adapter provides access to parameter structures, configuration backups, and system setup functions.
Communication and System Integration
The Lenze 8104_E.5B.21 connects to host control hardware using onboard screw terminal blocks for hardwired signal wiring and optional serial adapters for communication networks. Control inputs accept an adjustable analog setpoint signal supporting standard 0–10 V DC voltage or 0/4–20 mA current inputs for reference speed commands from external controllers or potentiometers.
Programmable digital inputs allow start, stop, and direction control signals to be wired directly from PLCs or control switches. An integrated failure status relay contact allows higher-level automation systems to monitor drive availability. For serial networking, the drive connects to Lenze LECOM RS232 or RS485 communication adapters for network integration and remote software access.
Diagnostics and Status Indication
Visual status indication on the Lenze 8104_E.5B.21 is provided by an onboard bi-color status LED. A solid green light signifies normal operating status, a solid red illumination flags an active drive trip or fault condition, and an unlit LED indicates an absence of mains supply voltage or an internal power supply issue.
Detailed fault diagnostics are retrieved using either the plug-in EMZ2102 keypad module display or by interrogating the drive's internal error history register using Lenze Global Drive Control software connected via a LECOM serial adapter.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready / Fault LED | Green / Red - Solid / Off / Flashing | Green indicates normal operating status; Red indicates active trip or fault condition; Off indicates no supply voltage or internal power supply failure. |
Replacement and Spare Part Considerations
When selecting a replacement drive for an existing Lenze 8100 series installation, verify that the 8104_E.5B.21 part number and motor power rating (0.75 kW, 4.0 A output) match the failed unit. Because the drive relies on stored internal parameters for motor control and I/O mapping, a replacement drive will not operate correctly until the original parameter set is loaded into its EEPROM memory.
Wiring terminations for mains power (180–264 V AC 1-phase or 3-phase), motor leads, and control I/O should be verified against original machine schematics during installation. Persistent hardware errors such as output stage short circuits (OC1) or unresolvable memory failures (EE) point to internal component breakdown that cannot be serviced on the plant floor, necessitating unit replacement or factory-level repair.
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 | Short circuit or earth fault on motor terminals/output phase | Short circuit in motor cable, short circuit in motor winding, grounding fault | Check motor and motor cables for phase-to-phase short circuits and insulation resistance to ground. If cable and motor test OK, internal power stage failure may exist (requires unit repair/replacement). |
| OC2 | Overcurrent Acceleration | Output current threshold exceeded during acceleration ramp | Acceleration time setting too short, excessive mechanical load or motor blocking | Increase acceleration time ramp, reduce load, check motor sizing and mechanical binding. |
| OC5 | Overcurrent Deceleration | Output current threshold exceeded during deceleration ramp | Deceleration time setting too short, high load inertia without brake chopper/resistor | Increase deceleration time ramp, install dynamic braking module/resistor if applicable. |
| OU | Overvoltage DC Bus | DC bus voltage exceeded upper threshold limit | Mains supply voltage too high or regenerative energy feeding back from motor during deceleration | Check mains input voltage level. Extend deceleration time or use braking resistor. |
| LU | Undervoltage DC Bus | DC bus voltage fell below lower limit | Mains supply voltage too low, phase loss, power supply interruption | Check supply line voltage and incoming phases under load. |
| OH | Heatsink Overtemperature | Heatsink temperature exceeded safety limit | Inadequate cooling, fan failure, ambient temperature too high, heatsink fouled | Clean heatsink fins, check control cabinet ventilation and ambient temperature, ensure integrated cooling fan operates. |
| OH4 | Motor Overtemperature | Motor temperature sensor trip (PTC or thermistor contact open) | Motor thermal overload, thermistor cable broken, inadequate motor cooling | Check motor operating temperature, motor fan function, load level, and PTC sensor connection. |
| EE | EEPROM Error | Internal parameter memory corrupt or checksum failure | Internal EEPROM failure, corrupted memory sector, internal hardware fault | Attempt factory parameter reset. If fault persists, internal hardware error exists — replace or send unit for repair. |
Frequently Asked Questions
What tools are required to transfer parameters to a replacement Lenze 8104_E.5B.21 drive?
Parameters can be transferred using the optional Lenze EMZ2102 operating keypad module or by using Lenze Global Drive Control (GDC) PC software connected via a Lenze LECOM RS232 or RS485 communication adapter.
Can the Lenze 8104_E.5B.21 drive run on single-phase supply power?
Yes, the drive accepts a 230 V class AC mains supply spanning 180 V to 264 V AC on either single-phase or three-phase input lines.
What does a red status LED signify on the 8104_E.5B.21 frequency inverter?
A solid red LED indicates an active trip or fault condition on the drive, requiring diagnostic check via keypad or software to identify the fault code.
What motor type and size is compatible with the Lenze 8104_E.5B.21?
The drive is designed for standard 4-pole three-phase AC motors rated up to 0.75 kW (1.0 HP) with continuous output currents up to 4.0 A.
How should an EE fault code be handled on this inverter?
An EE fault indicates EEPROM parameter memory corruption. First attempt a factory parameter reset. If the error remains, an internal hardware failure exists requiring drive repair or replacement.
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Specific firmware and hardware versions
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