Lenze 472-SO 470 Series DC Motor Speed Controller
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Product Information
The Lenze 472-SO is a single-phase analog DC motor speed controller from the Lenze 470 Series, designed to deliver precise speed regulation for permanent magnet and shunt-wound DC motors. Operating from a single-phase 230 V AC mains supply at 50/60 Hz, this compact drive provides an adjustable armature output voltage up to 180 V DC with a continuous armature current rating of 3.5 A. An integrated diode bridge rectifier provides an uncontrolled 200 V DC field supply output directly on board, allowing the unit to control both field-wound and permanent magnet DC motor configurations without requiring external field rectifiers.
Interfacing with the drive is handled via screw terminals that accommodate an analog 0 to 10 V DC setpoint signal or a standard 5 kΩ speed control potentiometer, along with connections for a DC tachogenerator and a dedicated controller release stop signal. Commissioning a replacement unit does not require digital programming software; instead, physical configuration jumpers determine whether the drive operates under armature voltage control with adjustable IxR compensation or closed-loop DC tachogenerator feedback. All speed, current limit, acceleration ramp, and voltage drop calibrations are set manually using multi-turn trimmer potentiometers directly on the circuit board. Because the "SO" designation indicates factory-customized Sonderausführung settings, service technicians swapping an existing module must verify physical potentiometer positions and terminal jumper configurations prior to applying power, with ABC Industrial Parts providing tested replacement drives to help restore production quickly.
Diagnostic monitoring on the Lenze 472-SO relies on dedicated front-facing LED indicators and accessible hardware test points. A solid green Netz / Ready LED confirms the presence of valid mains supply power, while a solid or flashing red Imax / Overcurrent LED signals that the continuous armature current limit has been reached or an overload condition is active. Operational checks can be performed using a multimeter across the setpoint, tachogenerator, and armature terminals to verify input control voltages and motor output responses under load. If internal component failures occur on the drive board, field repair is generally impractical, making an exchange drive from ABC Industrial Parts the most efficient path to minimizing machine downtime.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 472-SO |
| Component Type | DC Motor Speed Controller |
| Product Family | Lenze 470 Series |
| Supply Voltage | 230 V AC |
| Supply Frequency | 50/60 Hz |
| Max Armature Output Voltage | 180 V DC |
| Continuous Armature Current | 3.5 A |
| Field Supply Voltage | 200 V DC |
| Control Method | Analog DC speed control with selectable armature voltage (IxR compensation) or DC tachogenerator feedback |
Programming and Configuration
The Lenze 472-SO features a completely analog control structure that operates without microprocessors, firmware versions, or external software tools. All functional parameters are adjusted hardware-side via onboard multi-turn trimmer potentiometers. System calibrators use these trimmers to set minimum motor speed (nmin), maximum motor speed (nmax), armature current limit (I_max), acceleration ramp rate, and IxR compensation for armature voltage control modes.
Feedback control modes are selected through direct jumper configuration on the drive board. Technicians can configure the unit for armature voltage feedback with IxR drop compensation for standard applications or connect a DC tachogenerator for closed-loop speed regulation under changing torque loads. Setup requires only standard electrical tools and a multimeter to verify control voltages and calibrate trimmer responses during commissioning.
Diagnostics and Status Indication
Operational monitoring on the Lenze 472-SO is provided through two LED indicators located on the main control board. The green Netz / Ready LED lights solid when the 230 V AC supply voltage is properly applied. The red Imax / Overcurrent LED illuminates solid or flashes when the armature current hits the calibrated current threshold or when an overload condition is detected on the motor output.
Additional diagnostic testing can be conducted using standard multimeter measurements across the connection screw terminals. Technicians can measure the 0–10 V DC analog setpoint signal, evaluate DC tachogenerator feedback voltage under motor rotation, monitor the controller release stop terminal, and measure output voltage across the armature and field supply terminals.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Netz / Ready | Green - Solid | Supply power present |
| Imax / Overcurrent | Red - Solid/Flashing | Current limit active or overload condition |
Replacement and Spare Part Considerations
When replacing a failed Lenze 472-SO controller, ensure that the part number matches completely, including the "SO" designation which indicates factory special calibration features (Sonderausführung). Prior to installing a spare unit into an active control panel, record the physical jumper locations and trimmer potentiometer positions on the original board so that baseline settings can be replicated on the replacement drive.
Before restoring AC mains power to a newly installed replacement unit, verify that motor armature current requirements do not exceed the 3.5 A continuous output limit and confirm that shunt-wound field connections match the 200 V DC integrated field output rating. Re-tune the multi-turn trimmers during initial power-up to confirm accurate nmax, nmin, acceleration ramp, and IxR compensation response for the specific machine application.
Frequently Asked Questions
What power supply does the Lenze 472-SO require?
The Lenze 472-SO operates on a single-phase 230 V AC supply at 50/60 Hz.
Does the Lenze 472-SO require software for setup?
No software or digital programming equipment is required. The drive uses onboard multi-turn trimmer potentiometers and physical hardware jumpers for parameter adjustment and feedback selection.
What speed feedback methods can be used with this drive?
The drive supports two feedback modes selected via jumper configuration: armature voltage feedback with adjustable IxR compensation, or closed-loop DC tachogenerator feedback.
What does the 'SO' designation in the part number indicate?
The 'SO' (Sonderausführung) suffix indicates factory-customized calibration or configuration settings, making physical verification of trimmers and jumpers essential during replacement.
What are the output limits for the armature and field supply?
The unit provides a maximum armature output voltage of 180 V DC with a continuous armature current of 3.5 A, along with a built-in 200 V DC field supply.
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Specific firmware and hardware versions
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Disclaimer:
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