Lenze 481 E SO DC Speed Controller – 480 / 481 Series
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Product Information
The Lenze 481 E SO is a 1-quadrant thyristor DC speed controller from the Lenze 480 / 481 series, engineered for precise variable speed regulation of small DC shunt motors and permanent magnet DC motors rated up to 0.5 kW. Operating from a single-phase 230 V AC mains supply, the controller delivers a regulated 180 V DC output to the motor armature with a continuous rated current of 3.2 A and provides an integrated 190 V DC fixed field supply capable of delivering up to 0.5 A for field winding excitation. To handle dynamic starting conditions and heavy load changes in applications such as conveyor belts, packaging equipment, and metering pumps, the drive supports a 150 percent peak overload current of 4.8 A for up to 60 seconds.
Commissioning a spare unit does not require software programming tools, as speed control, current limits, and acceleration or deceleration ramps are adjusted entirely through hardware potentiometers on the board. Calibration involves setting minimum and maximum speed limits, current limiting thresholds, acceleration and deceleration ramp rates, and choosing between open-loop armature voltage regulation with IxR compensation or closed-loop feedback using a 10 V to 100 V DC tachometer. Because the SO suffix designates a special execution variant that may include custom terminal arrangements, modified factory presets, or protective coatings, replacement installation requires verifying terminal alignment and copying existing potentiometer settings. ABC Industrial Parts can assist maintenance teams with replacement units and technical guidance when preparing a spare module for service.
System state and operating conditions are indicated via onboard status LEDs and test points. A solid green READY / POWER LED indicates that mains AC voltage is applied, while a solid or flashing red/yellow LIMIT / CURRENT LIMIT LED indicates active current limiting or a motor overload condition. Technicians can measure armature current and speed reference signals directly at built-in analog test points or check terminal voltages with a multimeter during troubleshooting. If power supply connections and motor wiring are verified but output drive signals fail to operate, internal board-level faults may be present, making a fully tested exchange unit or professional repair through ABC Industrial Parts the fastest solution to minimize production downtime.
Technical Specifications
| Manufacturer | Lenze |
| Part number | 481 E SO |
| Model / type | 481 E |
| Component type | DC Speed Controller |
| Product family | 480 / 481 Series |
| Supply voltage | 230 V AC (Single-Phase) |
| Armature output voltage | 180 V DC |
| Rated armature current | 3.2 A |
| Peak armature current | 4.8 A (up to 60 seconds) |
| Field voltage | 190 V DC |
| Max field current | 0.5 A |
| Rated power | 0.5 kW |
| Control principle | 1-Quadrant Thyristor Control with IxR Compensation or Tacho Feedback |
Programming and Configuration
Configuration of the Lenze 481 E SO is accomplished through hardware-based adjustments using onboard analog potentiometers. No software installation, programming cables, or digital parameterization tools are needed to get the drive operational.
Parameters such as minimum speed, maximum speed, current limiting, IxR compensation, and acceleration and deceleration ramp rates are set directly on the trimpots. The drive supports open-loop operation via armature voltage feedback with adjustable IxR compensation to account for motor resistance losses, or closed-loop speed regulation via connection to a 10 V to 100 V DC tachometer.
When setting up a replacement unit, technicians should measure and replicate the potentiometer resistance values or test-point voltage levels from the original unit using a multimeter prior to powering the motor under load.
Communication and System Integration
Integration of the Lenze 481 E SO into control systems is managed through hardwired power and analog control terminals without fieldbus network connections. The controller connects directly to a single-phase 230 V AC supply and provides dedicated output terminals for the 180 V DC armature circuit and 190 V DC field circuit.
For closed-loop operation, input terminals accept a DC tachometer signal in the range of 10 V to 100 V DC. Built-in analog test points allow external monitoring of key operating variables, including speed reference voltage and armature current, using standard measurement instruments.
Diagnostics and Status Indication
Diagnostics on the Lenze 481 E SO are performed visually via status LEDs and electrically using dedicated onboard analog test points. These test points permit real-time measurement of motor armature current and speed setpoint signals during operation.
Troubleshooting begins by verifying mains supply voltage at the 230 V AC input terminals and checking field voltage across the 190 V DC field connections. If the current limit LED activates solid or flashes, inspect the driven load for mechanical overload or high starting friction exceeding the 4.8 A peak current limit.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| READY / POWER | Green - Solid | Mains supply power is present |
| LIMIT / CURRENT LIMIT | Red/Yellow - Solid/Flashing | Current limiting active or motor overload condition |
Replacement and Spare Part Considerations
When installing a replacement Lenze 481 E SO, verify that the application matches the controller's main electrical ratings: single-phase 230 V AC supply, 180 V DC armature voltage up to 3.2 A continuous, and 190 V DC field output up to 0.5 A for motors up to 0.5 kW.
Because the 'SO' designation denotes a special execution version (Sonderausführung), terminal layout and factory default wiring arrangements must be carefully compared against the installed unit before energizing the system.
Ensure that the speed feedback selection matches the original system configuration—either armature voltage control with IxR compensation or closed-loop DC tachometer feedback (10 V to 100 V DC)—and duplicate all trimpot settings using a multimeter to maintain existing machine performance.
Frequently Asked Questions
Is software required to configure the Lenze 481 E SO?
No software tools or programming cables are required. All configuration is done manually using hardware potentiometers on the unit to set speed limits, current limits, IxR compensation, and ramps.
What speed feedback options are available on the Lenze 481 E SO?
The controller supports armature voltage regulation with adjustable IxR compensation for open-loop operation, or direct connection to a DC tachometer (10 V to 100 V DC output) for closed-loop control.
What do the status LEDs on the Lenze 481 E SO indicate?
A solid green READY / POWER LED indicates that mains power is applied. A solid or flashing red/yellow LIMIT / CURRENT LIMIT LED indicates active current limiting or a motor overload condition.
What does the 'SO' suffix in the part number 481 E SO stand for?
The 'SO' suffix stands for Sonderausführung (special execution), indicating custom factory configurations such as specific terminal layouts, modified presets, or protective coatings.
What are the power and voltage ratings of the Lenze 481 E SO?
It operates on a single-phase 230 V AC mains supply, providing an 180 V DC armature output at 3.2 A continuous (4.8 A peak overload for 60 seconds) and a fixed 190 V DC field supply at up to 0.5 A for motors up to 0.5 kW.
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