Lenze 00405780 EMZ9371BB Operating Keypad Module
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Product Information
The Lenze 00405780 (model EMZ9371BB) is an operating keypad module designed for direct attachment to Lenze 9300 Servo Drives, 9300 Servo PLCs, and 8200 Vector frequency inverters. Functioning as a local human-machine interface and control unit, it provides direct parameterization, commissioning, and real-time operational monitoring without requiring an external computer. The module features a high-contrast, backlit LCD screen with two lines of 16 characters each, allowing technicians and operators to navigate drive parameters and monitor operating states in clear text.
Connecting via the host drive's front-facing Automation Interface (AIF) multi-pin slot, the EMZ9371BB operates on a 5 V DC supply drawn directly from the inverter host without external power wiring. Putting a replacement module into service or restoring a replacement drive is straightforward thanks to the keypad's integrated non-volatile EEPROM memory. Complete parameter configurations can be backed up from an active unit into the keypad's internal memory and written directly to a new controller. For systems aligned with Lenze Global Drive Control (GDC) software, parameter sets can also be verified during commissioning, with ABC Industrial Parts providing tested replacement modules to streamline setup.
Diagnostics are displayed directly on the 2x16 LCD screen, showing active drive states such as READY, IMP, TRIP, and FAIL, as well as descriptive fault trip logs in the internal history memory. Common operational faults, including communication interrupts like CE0 or EEPROM read errors like EER, can often be resolved by verifying the module's seating in the AIF slot or reloading factory settings. When persistent power-stage or internal sensor trips indicate deeper drive failures, ABC Industrial Parts offers replacement units and repair options to quickly restore system uptime.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 00405780 |
| Model / Type | EMZ9371BB |
| Component Type | Operating Keypad Module |
| Product Family | 9300 Servo |
| Supply Voltage | 5 V DC |
| Display Type | Backlit LCD, 2 lines x 16 characters |
| Mounting Type | Pluggable onto drive front panel (AIF slot) |
| Interface Type | Lenze Automation Interface (AIF) Multi-Pin Connector |
| Lifecycle Status | Discontinued (Replaced by EMZ9371BC / 00460346) |
Programming and Configuration
The Lenze EMZ9371BB keypad module enables full local parameterization and configuration directly on the host drive front panel. Through its intuitive parameter menu structure displayed on the 2x16 backlit LCD, operators can adjust drive limits, acceleration ramps, control modes, and operational variables without relying on an external PC or special cable interface.
An essential feature of the EMZ9371BB is its onboard non-volatile EEPROM memory. This non-volatile storage allows users to execute complete parameter set uploads and downloads directly between identical drive controllers. In maintenance scenarios, parameter profiles can be copied into the keypad memory from a running drive and saved or transferred to a spare unit in minutes.
In addition to direct keypad menu navigation, the module supports integration with Lenze Global Drive Control (GDC) software. This dual compatibility ensures that system integrators and field technicians can perform thorough drive commissioning, parameter verification, and backup routines during replacement or system maintenance.
Communication and System Integration
The EMZ9371BB keypad module utilizes the Lenze Automation Interface (AIF) multi-pin connector to establish a direct connection with compatible drive controllers. It plugs directly into the designated front AIF slot of Lenze 9300 Servo Drives, 9300 Servo PLCs, and 8200 Vector Frequency Inverters.
Power for the keypad module is derived directly through the host drive's AIF slot at 5 V DC. This hot-pluggable design eliminates the need for external power supplies, field wiring, or dedicated mounting brackets, ensuring a clean and compact interface on the drive enclosure.
Diagnostics and Status Indication
The EMZ9371BB module provides plain-text visual diagnostics on its 2x16 backlit LCD screen. Operational conditions such as READY (unit operational), IMP (pulse inhibit active), TRIP (fault shutdown), and FAIL (system error) are displayed in real time to give operators instant feedback on drive status.
For advanced troubleshooting, the keypad provides access to the host drive's TRIP memory fault buffer. This historical record retains fault trip events, permitting maintenance technicians to diagnose intermittent operational issues, verify electrical faults, and trace environmental trips.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Drive Status Display (LCD) | Active Screen Text | Displays operational status (e.g., READY, IMP, TRIP, FAIL) or fault text directly on screen |
Replacement and Spare Part Considerations
When replacing a Lenze 00405780 (EMZ9371BB) operating keypad module, ensure the unit is fully seated into the host drive's AIF slot. Because the module receives 5 V DC directly from the host, loose seating can result in an AIF communication error (CE0) or screen power loss.
The EMZ9371BB allows plant technicians to replace failed drive controllers rapidly by transferring stored parameter sets from its EEPROM memory directly into the spare drive. Although Lenze has discontinued the EMZ9371BB, the EMZ9371BC (part number 00460346) serves as the direct successor for modern replacement requirements.
To prevent downtime during drive swaps, maintain a recorded parameter backup using the keypad or Global Drive Control (GDC) software. Before re-commissioning a spare drive on the factory floor, verify that all motor control settings and network node configurations match the existing application requirements.
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 extreme overcurrent detected during acceleration or steady operation. | Motor cable short circuit, winding earth fault, motor current too high. | Check motor wiring and motor insulation. If fault persists with motor disconnected, internal power stage failure; contact service. |
| OC2 | Earth Fault | Ground fault / earth current fault detected on output phase. | Ground fault in motor lead or motor winding. | Check motor cables and motor insulation resistance. Repair wiring or replace motor. |
| OU | DC Bus Overvoltage | DC bus voltage exceeds maximum allowed upper threshold. | Braking energy too high, deceleration ramp too short, brake chopper/resistor defective or disconnected. | Extend deceleration time (decel ramp), check external braking resistor and chopper circuit. |
| LU | DC Bus Undervoltage | DC bus voltage dropped below minimum operating limit. | Mains supply line failure, phase loss, supply voltage too low. | Check incoming AC line supply, fuses, and power connections. |
| OH | Heatsink Overtemperature | Drive heat sink temperature exceeded maximum allowed limit. | Fan blocked or failed, ambient temperature too high, heatsink clogged with dirt. | Clean heatsink, check cabinet cooling and operation of internal cooling fans. |
| OH4 | Thermal Sensor Fault | Internal temperature sensor measuring error or trip. | Internal heat sink temperature measurement failure. | Internal hardware failure. Return drive unit for repair. |
| NMAX | Speed Limit Exceeded | Actual motor speed exceeded maximum configured speed limit. | Uncontrolled load, incorrect speed feedback scaling, or loop tuning instability. | Check speed controller parameters, encoder feedback, and mechanical coupling. |
| CE0 | AIF Communication Error | Communication failure or module missing on AIF slot. | Keypad or communication module loosely seated, electrical contact error. | Re-seat the keypad/module firmly onto the AIF slot; inspect connector pins. |
| EER | EEPROM Fault | Internal EEPROM read or write error. | Corrupted non-volatile memory or hardware fault in EEPROM chip. | Reload factory settings. If fault persists, replace keypad module or drive board. |
Frequently Asked Questions
What drive series are compatible with the Lenze 00405780 EMZ9371BB keypad module?
The EMZ9371BB module is compatible with Lenze 9300 Servo Drives, Lenze 9300 Servo PLCs, and Lenze 8200 Vector Frequency Inverters.
Does the EMZ9371BB keypad require external power supply wiring?
No, the module is powered with 5 V DC directly from the host drive through its Automation Interface (AIF) slot upon installation.
How does the non-volatile EEPROM memory assist in drive replacement?
The internal EEPROM allows users to back up complete parameter configurations from a working drive and copy them directly into a replacement drive controller without using a PC.
What should I check if the keypad displays a CE0 fault code?
A CE0 code indicates an AIF communication error. Check that the keypad module is firmly seated in the front AIF slot and inspect the connector pins for damage or contamination.
Is the Lenze 00405780 EMZ9371BB still in active production?
No, the EMZ9371BB is discontinued by Lenze. The direct manufacturer successor is model EMZ9371BC (part number 00460346).
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