Lenze 9321MP.2Q.21 33.9321ML.1A-13.001 9300 Series Servo Inverter
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Product Information
The Lenze 9321MP.2Q.21 (model 33.9321ML.1A-13.001) is a 0.37 kW servo inverter module engineered for dynamic motion, speed, and torque control within the Lenze 9300 Series. Designed for field-oriented vector control of AC servo motors, such as Lenze 9300 series 0.37 kW motors, this unit operates across a 3-phase supply voltage range of 320 V AC to 528 V AC at 400/480 V AC nominal. It delivers a continuous output current of 1.5 A into a 0 to 480 V AC output range with a maximum output frequency of 480 Hz. To accommodate heavy acceleration ramps and high load inertia in packaging, automotive, textile, and material handling systems, the inverter provides a 150 percent temporary peak overload capacity of 2.25 A for up to 60 seconds at its default 8 kHz switching frequency.
Integrating a replacement 9321MP.2Q.21 into an active production line requires matching physical and parameter configurations. The module features an integrated Lenze System Bus (CAN interface) operating at up to 500 kbps on X4 terminals alongside onboard feedback inputs for resolvers via a Sub-D connector and master frequency or encoder signals. Higher-level fieldbus networking is managed through the modular Automation Interface (AIF) slot, which accepts options such as the EMF2133IB PROFIBUS, EMF2175IB DeviceNet, or EMF2102IB LECOM communication modules. Before placing a replacement drive into service, technicians must transfer operational parameters using Lenze Global Drive Control (GDC) software version 4.x or higher, or the pluggable Keypad XT (EMZ9371BC). Up to four complete parameter sets can be stored in non-volatile internal memory, allowing parameter extraction and re-installation to minimize machine downtime. ABC Industrial Parts can assist with sourcing tested replacement units and preparing parameter configurations for rapid deployment.
Real-time operational monitoring and fault detection are handled through front panel LED indicators and software diagnostic tools. Three status LEDs provide immediate feedback on unit condition: a green DRIVE READY LED signals operational status or active drive enablement, a red TRIP / FAULT LED indicates active trip faults or warning lock states, and a yellow IMP LOCK LED confirms pulse inhibition. Diagnostic history is accessible via the Keypad XT error buffer or the GDC online diagnostic monitor, storing the last four error events with timestamps in parameters C0168 and C0170. System faults range from short circuits (OC1), earth faults (OC2), and DC bus overvoltage (OU) to fieldbus errors like CANbus faults (CE4). Certain internal conditions, such as internal hardware faults (H05) or EEPROM failures (EER), stem from board-level component issues that cannot be serviced in the field. In these instances, swapping the unit with a fully tested exchange module from ABC Industrial Parts offers the most dependable path to restoring equipment operation.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 9321MP.2Q.21 |
| Model / Type Designation | 33.9321ML.1A-13.001 |
| Product Family | 9300 Series |
| Component Type | Servo Inverter |
| Rated Power | 0.37 kW |
| Supply Voltage Range | 320 - 528 V AC |
| Rated Output Current | 1.5 A |
| Peak Output Current | 2.25 A (150% for 60 s) |
| Output Voltage Range | 0 - 480 V AC |
| Maximum Output Frequency | 480 Hz |
| Default Switching Frequency | 8 kHz |
| Control Method | Field-oriented vector control / Servo control |
Programming and Configuration
Configuration of the Lenze 9321MP.2Q.21 servo inverter is carried out using Global Drive Control (GDC) software version 4.x or higher, or directly through the optional Keypad XT (EMZ9371BC). Parameter structures manage drive behavior, vector control tuning, feedback scaling, and communication settings across the machine network.
The drive features internal non-volatile EEPROM memory capable of storing up to four independent parameter sets. Parameters can be copied, edited, and restored across units using GDC or the Keypad XT module. When reloading factory default settings, code C0002 is executed to clear custom parameters and re-initialize default factory values.
Communication and System Integration
Network communication and multi-axis drive synchronization are supported by the integrated Lenze System Bus (CAN interface). Operating on pluggable X4 terminals at data transfer rates up to 500 kbps, the system bus enables real-time inter-drive synchronization and central control across multi-axis automated machinery.
For connection to broader plant automation networks, the inverter includes a dedicated Automation Interface (AIF) expansion slot. This slot accepts modular communication interface cards, including the EMF2133IB PROFIBUS module, EMF2175IB DeviceNet module, and EMF2102IB LECOM module (RS-232/RS-485). Feedback interfacing includes dedicated terminals for resolvers via a Sub-D connector and inputs for encoder or master frequency signals.
Diagnostics and Status Indication
Visual diagnostics on the front panel of the Lenze 9321MP.2Q.21 are provided by three status LEDs: DRIVE READY (green), TRIP / FAULT (red), and IMP LOCK (yellow). These LEDs indicate power stage readiness, pulse inhibition, active warnings, and trip fault states without requiring external diagnostic tools.
Detailed diagnostic investigation is enabled through the Keypad XT error buffer and the GDC online monitoring interface. The internal ring buffer stores the four most recent fault occurrences with timestamps in sub-menu codes C0168/1..4 and C0170, allowing maintenance personnel to diagnose transient network or power faults.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| DRIVE READY | Green - Solid / Blinking | On: Drive operational and ready for operation. Blinking: Drive enabled / active operation. |
| TRIP / FAULT | Red - Solid / Blinking | On: A fault (TRIP) condition has occurred; drive inhibited. Blinking: Warning or lock state active. |
| IMP LOCK | Yellow - Solid | On: Pulse inhibit active (power output stage disabled). |
Replacement and Spare Part Considerations
When replacing an existing 9321MP.2Q.21 (model 33.9321ML.1A-13.001) servo inverter, ensure that both the main part number and model designation match the installed hardware. Verify that any fitted Automation Interface (AIF) card—such as a PROFIBUS or DeviceNet module—is transferred from the original unit to maintain network communications.
Before restoring line power, transfer the active parameter set to the replacement drive using GDC software V4.x+ or the Keypad XT. Ensure proper address settings on CANbus termination resistors (120 Ohm) and node selectors. Verify motor wiring, resolver connections, and supply voltage levels prior to enabling the power output stage.
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 detected on inverter motor output terminals. | Short circuit in motor winding or motor cable; excessive motor cable length/capacitance. | Check motor cable and winding insulation for short circuits; check motor cable length. |
| OC2 | Earth Fault | Ground fault / earth fault detected at the inverter output. | Short circuit between motor phase and ground/PE; bad motor insulation. | Check motor wiring and motor windings for insulation resistance to ground. |
| OC5 | Ixt Overload Acceleration | Dynamic overload during acceleration phase. | Acceleration ramp too steep; mechanical blockage or excessive load inertia. | Increase acceleration time; check mechanical load for binding or overload. |
| OU | Overvoltage DC Bus | DC bus voltage exceeds upper threshold. | Excessive regenerative energy during deceleration; braking chopper/resistor defective or missing; deceleration ramp too short. | Extend deceleration time; verify brake resistor function and connection. |
| LU | Undervoltage DC Bus | DC bus voltage falls below lower limit. | Supply line voltage too low; main supply phase loss; power failure. | Check AC mains supply voltage and fuses; check line power connections. |
| OH | Heatsink Overtemperature | Inverter heatsink temperature exceeded maximum safety threshold. | Insufficient cooling airflow; ambient temperature too high; dirty heatsink fins; cooling fan failure. | Clean heatsink cooling fins; verify control cabinet ventilation and fan operation. |
| OH3 | Motor Overtemperature | Motor thermal sensor (PTC/TK) reported overtemperature. | Motor thermal overload; continuous operation at low speed with heavy load; PTC wiring defect. | Allow motor to cool; check mechanical load; check motor PTC sensor circuit wiring. |
| OH7 | Internal Drive Overtemperature | Internal ambient temperature inside inverter enclosure too high. | Control cabinet internal temperature excessive; internal cooling issue. | Improve cabinet cooling and airflow around the drive unit. |
| CE0 | Communication Fault AIF | Communication interruption between inverter and Automation Interface (AIF) module. | AIF communication module loose or missing; fieldbus master timeout. | Check seating of AIF option module; verify fieldbus cable and master state. |
| CE4 | CANbus Fault | Communication error on internal system bus (CAN). | Bus cable disconnected; missing termination resistor; incorrect baud rate; bus off state. | Check CAN wiring, bus termination resistors (120 Ohm), and node address configuration. |
| Pr | Parameter Error | Checksum error or invalid data detected in parameter set. | Power failure during parameter save; corrupted internal EEPROM. | Load factory default parameters (C0002) and re-download unit parameters. |
| H05 | Internal Hardware Fault | Internal controller board error or hardware component failure detected during self-test. | Internal hardware component defect on control or power board. | Internal hardware fault — power cycle drive; if error persists, return unit for repair or replace. |
| EER | EEPROM Fault | Read/write error accessing internal EEPROM memory. | Defective EEPROM chip or internal memory failure. | Internal hardware fault — unit requires return for repair or replacement. |
| LP | Motor Phase Failure | Phase loss detected on inverter output to motor. | Interrupted motor lead cable; contactor open on motor output side. | Check output power wiring and contactors between inverter and motor. |
| NMAX | Speed Limit Exceeded | Motor feedback speed exceeded safe software limit. | Incorrect resolver/encoder scaling; overspeed driven by external mechanical load. | Check feedback sensor setup and mechanical system speed limits. |
Frequently Asked Questions
What software and hardware are required to program the Lenze 9321MP.2Q.21?
The drive can be programmed using Lenze Global Drive Control (GDC) software version 4.x or higher, or directly using the pluggable Keypad XT (EMZ9371BC) control module.
How are parameter configurations transferred to a spare drive?
The inverter stores up to four complete parameter sets in non-volatile internal memory. Parameter sets can be downloaded or backed up using GDC software V4.x+ or transferred directly using the Keypad XT module.
Which fieldbus communication options can be used with this drive?
The unit features an integrated CANbus system bus on X4 terminals. Additional fieldbus integration is available via the Automation Interface (AIF) slot using modules such as EMF2133IB (PROFIBUS), EMF2175IB (DeviceNet), or EMF2102IB (LECOM).
What should I check if the drive displays fault code H05 or EER?
Fault codes H05 and EER indicate internal hardware or memory failures. Attempt a power cycle first. If the fault persists, internal control or power components have failed, requiring repair or drive replacement.
What supply voltage and power output ratings does this model support?
The Lenze 9321MP.2Q.21 operates on a 3-phase AC supply ranging from 320 to 528 V AC, delivering a continuous rated output of 0.37 kW at 1.5 A, with a 60-second peak overload current of 2.25 A.
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