Lenze 492-E.4B DC Motor Speed Controller 16A 400VAC
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Product Information
The Lenze 492-E.4B is a 16 A DC motor speed controller operating on a 400 V AC mains supply, developed as part of the Lenze 490 Series. Designed for precise speed regulation of permanent magnet and separately excited DC industrial motors, this thyristor speed regulator provides armature voltage control paired with dynamic current limiting to ensure stable torque output under varying loads. The heavy-duty thyristor power bridge architecture provides dependable motor drive performance in industrial machinery such as conveyor drives, material handling systems, extruder feeds, and winding equipment.
Interfacing with external control signals is handled via terminal block connections supporting a 0–10 V DC analog speed setpoint or a standard 10 kOhm speed potentiometer, alongside dedicated digital Enable and Inhibit logic inputs for start and stop sequencing. Speed feedback can be configured using standard IxR armature drop compensation or closed-loop regulation via a DC tachometer rated between 20 V and 100 V per 1000 RPM. Commissioning a replacement unit requires no programming software or digital menus; parameter settings are hardware-driven via onboard trim potentiometers that adjust maximum speed, minimum speed, peak armature current limit, IxR drop compensation, and acceleration or deceleration ramps. Aligning these physical trimmer positions and jumper links to match the original drive configuration allows ABC Industrial Parts to support field technicians in getting equipment back into operation smoothly.
Visual system diagnostics are displayed directly on the unit via three LED indicators labeled Ready / Betrieb, Current Limit / I-max, and Fault / Störung, complemented by an internal status relay output for remote alarm monitoring. Practical diagnostic checks include verifying incoming line supply voltage, measuring 0–10 V DC speed setpoint signals, checking tachometer feedback inputs, and taking analog voltage readings at circuit test points and screw terminals. When power bridge failures or internal circuit defects occur, hardware faults are not field-serviceable; replacing the malfunctioning unit with a tested exchange spare from ABC Industrial Parts provides a fast and effective solution to restore production.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 492-E.4B |
| Model / Type | DC Motor Speed Controller 16A 400VAC |
| Product Family | 490 Series |
| Component Type | DC Motor Speed Controller |
| Supply Voltage | 400 V AC |
| Continuous Armature Output Current | 16 A |
| Control Method | Thyristor Speed Control with IxR Compensation or Tachometer Feedback |
| Setpoint Input | 0-10 V DC or 10 kOhm Potentiometer |
| Tachometer Feedback Input Range | 20 to 100 V per 1000 RPM |
| Control Logic Inputs | Controller Enable / Controller Inhibit |
| Relay Output | Ready / Operational Status Signaling |
Programming and Configuration
Parameterization of the Lenze 492-E.4B speed controller is completely hardware-based, eliminating the need for programming software, digital parameter tools, or handheld terminals. Setup relies on physical trimmer potentiometers and circuit jumpers located directly on the drive board, preventing parameter loss caused by power disruptions or electrical interference.
Field adjustment involves tuning discrete onboard potentiometers to establish maximum motor speed, minimum speed, peak current limit, IxR armature drop compensation, and acceleration and deceleration ramp times. Speed regulation mode selection is controlled via hardware jumpers, allowing selection between open-loop IxR compensation and closed-loop DC tachometer feedback within the 20 V to 100 V per 1000 RPM range.
Diagnostics and Status Indication
The Lenze 492-E.4B features visual LED indicators and hardware test points to streamline operational monitoring and troubleshooting. The Ready / Betrieb LED indicates main supply presence and internal operational readiness, while the Current Limit / I-max LED alerts operators when motor torque demand reaches the preset current limit threshold. System fault conditions trigger the Fault / Störung LED alongside the built-in status relay contact to signal alarm states to remote monitoring systems or higher-level controllers.
First-line diagnostic checks are conducted by evaluating analog signal levels at terminal connections and onboard PCB test points. Measuring setpoint voltages on the 0–10 V input terminals and verifying DC voltage feedback across tachometer inputs allows technicians to isolate external cabling, potentiometer, or tachometer faults from internal drive malfunctions.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready / Betrieb | Indicates system readiness and power status | |
| Current Limit / I-max | Indicates the controller has reached maximum set current limit | |
| Fault / Störung | Indicates a system fault or error condition |
Replacement and Spare Part Considerations
When replacing a Lenze 492-E.4B DC motor speed controller, verify that the application electrical parameters match the rated 400 V AC supply voltage and 16 A armature current rating. Confirm that the drive is correctly matched to either a permanent magnet or separately excited DC motor before installing the spare unit.
Prior to powering on a replacement unit, visually inspect the dial settings of all trimmer potentiometers on the original unit and mirror these settings on the replacement controller. Duplicate the exact physical positions for maximum speed, minimum speed, current limit, IxR drop compensation, and ramp rates, while ensuring jumper links for feedback selection are set to the identical feedback source (IxR or tachometer).
Once installed, verify control sequence logic across the Enable and Inhibit terminals before running the motor under load. Ensuring proper operational readiness via the Ready / Betrieb LED and checking setpoint response prevents unexpected acceleration or overcurrent trips during initial startup.
Frequently Asked Questions
What power supply and armature output current does the Lenze 492-E.4B support?
The Lenze 492-E.4B operates on a 400 V AC line input voltage and provides a continuous DC armature current output up to 16 A.
What motor speed feedback options are available on the 492-E.4B?
The controller supports selectable speed feedback modes using either IxR armature voltage drop compensation or closed-loop DC tachometer feedback rated between 20 V and 100 V per 1000 RPM.
Is software required to configure or program a replacement Lenze 492-E.4B drive?
No software or digital programming cables are required. All parameter adjustments, such as current limits, speeds, ramp times, and IxR compensation, are set using physical hardware trim potentiometers and circuit jumpers on the drive.
How is the speed setpoint provided to the 492-E.4B controller?
Speed setpoints can be supplied via terminal connections accepting a 0–10 V DC analog voltage input or by connecting a standard 10 kOhm external speed potentiometer.
What onboard status indicators are available for system diagnostics?
The unit provides three status LEDs labeled Ready / Betrieb, Current Limit / I-max, and Fault / Störung, alongside an internal relay contact for remote status signaling.
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A defective product does not have to be worthless. At ABC Industrial Parts, you can hand in defective products and immediately benefit from a discount on your new purchase. This is a smart way to save money while contributing to a circular economy.
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Industrial plants prefer to keep running invariably, no matter what. Therefore, it is essential that you can rely on high-quality products and/or sustainable repairs. With our warranty conditions, you can count on certainty, whether you choose new, used or repaired products.
Data backup and recovery
Have you lost valuable parameters or data due to a malfunction while the manufacturer no longer provides support? At ABC Industrial Parts, we help you secure this data, both for common and specific products.
Specific firmware and hardware versions
If you are working with specific hardware or firmware versions that are no longer available from the manufacturer, ABC Industrial Parts is your partner. When making your enquiry, clearly state which versions you need, we will then look at the possibilities of supplying those versions, so that your installations continue to function optimally.
Disclaimer:
We are not an authorised distributor of Lenze.
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