Lenze EVF9321-EV 9300 Vector Frequency Inverter 0.37kW
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Product Information
The Lenze EVF9321-EV is a 0.37 kW frequency inverter from the 9300 Vector series engineered for speed and torque control of three-phase AC asynchronous motors. Operating on a 3-phase mains supply from 320 V to 528 V AC with a rated input current of 1.2 A, this drive delivers a continuous output current of 1.5 A at a default switching frequency of 8 kHz across an output frequency range of 0 to 600 Hz. Control methods including sensorless vector control, field-oriented motor control, and configurable V/f characteristics allow the inverter to maintain high dynamic response in automated packaging machinery, material handling systems, and food processing lines.
Control integration and field connectivity are handled through flexible terminal arrangements and modular bus expansion. The unit provides six digital inputs, four digital outputs, two analog inputs, and two analog outputs alongside an onboard CANopen system bus interface on terminal block X4. For fieldbus networking, Automation Slot A accommodates communication modules such as PROFIBUS-DP (EMF2133IB), LECOM (EMF2102IB), Interbus, and DeviceNet. Internal non-volatile EEPROM memory stores up to four complete parameter sets. Parameter transfer for spare unit replacement can be completed using the plug-in Keypad XT (EMZ9371BC) or Lenze Global Drive Control (GDC) software, with parameter extraction and pre-configuration supported by ABC Industrial Parts when restoring donor or spare hardware.
Diagnostic feedback is delivered via status LEDs on the front panel and digital monitoring parameters. Dual LED indicators signal operational states including controller enable, controller inhibit (CINH), warning conditions, and active TRIP faults. Detailed error memory and trip statuses can be read out through diagnostic parameter C0168 or via GDC software. Fault codes such as OC1 (overcurrent), OU (DC bus overvoltage), and LU (DC bus undervoltage) point directly to supply, cabling, or ramp configuration issues. Internal hardware failures, including power transistor breakdown or fault H05, cannot be resolved through field adjustments; installing a verified replacement drive or dispatching the unit for professional repair through ABC Industrial Parts provides a direct solution to bring machinery back online.
Technical Specifications
| Rated Power | 0.37 kW |
| Supply Voltage Range | 320 - 528 V AC |
| Mains Input Current | 1.2 A |
| Continuous Output Current | 1.5 A |
| Output Frequency Range | 0 - 600 Hz |
| Switching Frequency | 8 kHz |
| Integrated Onboard Interface | CANopen (System Bus) |
| Digital Inputs | 6 |
| Digital Outputs | 4 |
| Analog Inputs | 2 |
| Analog Outputs | 2 |
Programming and Configuration
Parameterization and commissioning of the Lenze EVF9321-EV are performed using Lenze Global Drive Control (GDC) engineering software or the optional Keypad XT (EMZ9371BC) module. The GDC software application provides access to drive parameters, allowing configuration of motor characteristics, control modes, and operational ramps such as acceleration time (C0012) and deceleration time (C0013).
The inverter contains internal non-volatile EEPROM memory configured to retain up to four complete parameter sets. Stored configuration data remains preserved without external power. When replacing a drive in production, parameter files saved on a PC or copied into a Keypad XT module can be downloaded directly to the replacement unit, avoiding manual parameter entry and reducing machine commissioning time.
Communication and System Integration
Network integration is provided natively via the onboard CANopen system bus interface at terminal block X4. This interface enables deterministic multi-drive networking and direct data exchange with central controllers, allowing coordinated motion in conveyor systems and multi-axis machinery.
For broader automation architecture connectivity, Automation Slot A supports modular expansion options. Compatible fieldbus modules include PROFIBUS-DP (EMF2133IB), LECOM (EMF2102IB), DeviceNet, and Interbus cards. Installing these modules allows master PLCs to issue run commands, modify setpoints, and monitor operating diagnostics over standard industrial fieldbus networks.
Diagnostics and Status Indication
Drive status monitoring is available through physical LED indicators and digital software readouts. Active trip codes and historical fault logs are recorded in parameter C0168, accessible via Global Drive Control (GDC) software or the Keypad XT display module.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Red LED / Green LED (Front Panel Display) | Green / Red - Solid Green / Blinking Green / Blinking Red / Solid Red / Both Off | Green ON = Controller enabled; Green Blinking = Controller inhibit (CINH); Red Blinking = Warning/Non-critical fault active; Red ON = TRIP fault state active; Both OFF = No supply voltage |
Replacement and Spare Part Considerations
When selecting a replacement for an EVF9321-EV drive, match the exact part number and power rating (0.37 kW, 1.5 A output). Any optional fieldbus communication card attached to Automation Slot A—such as a PROFIBUS-DP module (EMF2133IB) or LECOM module (EMF2102IB)—must be uninstalled from the original unit and fitted onto the spare drive before powering up.
A replacement unit requires parameter configuration prior to running the machine. Uploading the parameter backup from the original drive via Keypad XT (EMZ9371BC) or Global Drive Control (GDC) software restores all motor settings, dynamic ramps, and terminal mapping. For long-term control platform modernization, the Lenze i550 cabinet inverter series serves as the recommended modern successor.
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 short circuit or excessive motor output current | Short circuit in motor cable or motor winding; excessive acceleration ramp rate; motor improperly dimensioned | Check motor and motor cable for short circuits/earth faults; check ramp times (C0012/C0013); if fault occurs immediately without motor connected, internal power transistor failure (return for repair) |
| OC2 | Earth fault | Ground fault / earth leakage current detected on output phase | Earth fault in motor phase or motor cable; excessive motor cable length and capacitive leakage current | Check motor wiring and insulation resistance with megohmmeter; check cable length and shielding; return unit for service if fault persists with disconnected motor wiring |
| OC5 | I x t overload | Continuous motor overload or output current exceeded thermal limit | Drive continuously operated above rated current; mechanical blockage or excessive load on motor | Check mechanical load and motor sizing; reduce duty cycle or acceleration rate |
| OH | Heatsink overtemperature | Inverter heatsink temperature exceeds maximum allowable threshold (>85°C) | Insufficient cabinet cooling; fan failure or clogged heat sink fins; ambient temperature too high | Clean heatsink, verify fan function, ensure adequate panel ventilation and ambient temperature compliance |
| OH4 | Motor overtemperature | Motor temperature sensor (PTC/TK) tripped on terminals T1/T2 | Motor thermal overload; PTC sensor tripped; loose thermistor wire | Allow motor to cool; check mechanical load; check PTC connections on control terminals |
| OU | DC bus overvoltage | DC bus voltage exceeds upper threshold (>770 V DC) | Excessive regenerative energy returned during deceleration; deceleration ramp time too short; brake chopper failure or missing brake resistor | Increase deceleration time (C0013); install or check external braking module and brake resistor |
| LU | DC bus undervoltage | DC bus voltage dropped below minimum operating limit (<435 V DC) | Mains supply failure; phase loss; mains supply voltage too low; input fuse blown | Check line input voltage, fuses, and main contractor; inspect DC link voltage level |
| LP1 | Mains phase failure | Phase loss detected on AC power input | One input line phase missing or severe line imbalance | Check input power lines L1, L2, L3 and upstream fuses |
| CE0 | System bus communication error | CAN system bus communication fault or bus-off state | Bus cable broken or disconnected; incorrect baud rate setting; missing bus terminating resistors | Check CAN bus wiring and shielding; verify terminal resistors (120 Ohm) at end nodes; check baud rate parameters |
| EER | EEPROM memory fault | Internal EEPROM data corruption or checksum error | Power interrupted during parameter save; internal EEPROM hardware fault | Reload factory default settings (C0002 = 1) and re-commission drive; internal hardware failure requires replacement or factory repair if fault persists |
| H05 | Internal hardware fault | Internal electronic board failure or micro-controller hardware fault | Internal board component defect or corrupted firmware | Non-field serviceable internal hardware fault; replace inverter unit or send to repair center |
| NMAX | Maximum speed limit exceeded | Actual motor speed exceeds configured maximum threshold C0011 | Motor speed control loop instability or field weakening overspeed | Check speed controller gains and C0011 maximum speed setting |
Frequently Asked Questions
What software tools are used to program the Lenze EVF9321-EV?
Parameter setup, diagnostic monitoring, and backup procedures are carried out using Lenze Global Drive Control (GDC) software or manually using the plug-in Keypad XT (EMZ9371BC) module.
Can I transfer parameters to a new drive without using a PC?
Yes. Parameter configurations can be copied directly using the plug-in Keypad XT module (EMZ9371BC) or transferred through the internal non-volatile EEPROM memory, which holds up to four parameter sets.
What does a solid red display LED mean on the EVF9321-EV?
A solid red LED indicates an active TRIP fault state that shuts down inverter operation. The specific trip cause can be identified by reading diagnostic parameter C0168 via Keypad XT or GDC software.
Which fieldbus communication options are supported on this inverter?
The drive includes built-in CANopen on terminal block X4. Modular cards installed in Automation Slot A provide options for PROFIBUS-DP (EMF2133IB), LECOM (EMF2102IB), DeviceNet, and Interbus.
How should an OC1 fault code be resolved?
An OC1 code indicates an overcurrent or short circuit condition. Inspect motor cabling and motor windings for insulation faults or short circuits, and verify acceleration ramp settings. If OC1 triggers immediately with the motor disconnected, internal power transistor damage is indicated.
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