Kolmorgen SR20201-000000 Servo Drive Detailed Product Description

I. Product Overview

SR20201-000000 is a 20A class, 480V, basic type (not 2G) fully digital servo drive from the ServoStar SR series of Kolmorgen. The model suffix -000000 represents the simplest configuration of basic hardware, without fieldbus, standard I/O, single feedback interface, no STO safety function, and built-in regenerative braking. It is designed for high-power applications of 7.5–11kW in 480V industrial power supply environments, suitable for traditional machine tools, presses, fans, pumps, material handling, and other general automation scenarios that do not require bus communication and aim for high power, high reliability, and low cost. 

II. Complete Model Analysis

S - ServoStar SR Series Servo Driver

R - Supports Resolver + Encoder Dual Feedback Hardware Interface

20 - Current Specification - Continuous Output Current 20A RMS (20A Class Driver)

201 - Voltage Specification - Three-phase 480VAC Input (200 = 230V, 201 = 480V)

-000000 - Function Configuration Code (Basic Version, No Extended Function)

The first digit 0 - Communication: No Fieldbus, Only Analog / Pulse Commands + RS-232 Debug

The second digit 0 - Feedback: Single Feedback Interface (Incremental Encoder / Resolver Either)

The third digit 0 - I/O: Standard I/O (8DI/4DO)

The fourth digit 0 - Function: Built-in Regenerative Braking, No STO Safety Function

The fifth and sixth digits 00 - Hardware Version: Basic Version (Not 2G)

III. Core Electrical Parameters

1. Power Supply and Power Specifications (480V High Power Version)

Input Power Supply: Three-phase 480VAC ±10%, 50/60Hz (Bus 650–850VDC)

Control Power Supply: DC 24V ±10%, 1.5A (External Auxiliary Power Supply)

Continuous Output Current: 20.0A RMS (S1 Continuous, 40°C)

Peak Output Current: 60.0A RMS (3× Rated, Continuous ≤ 5s)

Applicable Motor Power: 7.5–11kW (480V Class Brushless Servo Motor)

Carrier Frequency: 8–12kHz (Standard Vector Control)

Control Mode: Position / Speed / Torque Three-loop Full Digital Vector Control

Command Input: ±10V Analog, Pulse / Direction, Potentiometer (Three Modes Compatible)

2. Feedback and Interfaces (Basic Version)

Feedback Support: Incremental Encoder (2500–8192ppr), 12-pole Resolver (Single Interface)

Communication Interface: RS-232 (Debug), No Fieldbus

Digital I/O: 8DI (24V Optocoupler Isolation), 4DO (Open Collector) (Standard Configuration)

Analog I/O: 1× ±10V Command, 1× 0–10V Monitoring Output

Braking Function: Built-in Regenerative Braking Unit (Supports External Braking Resistor ≥ 1.5kW)

Protection Function: Overvoltage, Undervoltage, Overcurrent, Short Circuit, Overload, Overheating, Encoder Break, Over-speed, I/O Failure

3. Dynamic Performance and Precision (Standard Basic Version)

Current Loop Response: ≤120μs

Speed Loop Response: ≤1.2ms

Position Loop Response: ≤2.5ms

Speed Regulation Range: 1:6000 (≤1rpm Low Speed Smooth)

Positioning Precision: ±1 Encoder Pulse (8192ppr)

Current Loop Bandwidth: ≥3kHz

Overheating Protection: Built-in NTC, 85°C Trigger Underload / Shutdown

IV. Physical and Mechanical Specifications

Size: 350mm × 105mm × 220mm (Standard Size of SR Series High Power)

Weight: 3.6kg (Approximately 7.9lb)

Protection Grade: IP00 (Installed in Control Cabinet)

Installation Method: Vertical Wall Mount (4 Points Fixed, Optimized Airflow)

Cooling Method: Single Fan Forced Air Cooling

Installation Spacing: 8cm or more of ventilation space around

Heat Dissipation Power: ≤85W (Rated Load)

V. Environment and Certification

Operating Temperature: 0°C ~ +40°C (No Underload)

Storage Temperature: -20°C ~ +85°C Relative Humidity: 5% – 90% RH (no condensation)

Vibration: 2.5g (10 – 2000Hz)

Impact: 15g (11ms)

Certification Standards: CE, UL 508C, cULus, EN 61800-3

VI. Core Technical Characteristics (Basic Version)

1. Standard Digital Vector Control Architecture

32-bit DSP Space Vector Algorithm, Four-Quadrant Reversible Operation, Regenerative Energy Feedback

Adaptive Parameter Self-Tuning: Automatic identification of motor parameters, inertia identification, friction compensation

Electronic Gear: Programmable Gear Ratio (1:1 to 1024:1)

Slot Torque Suppression: Low-speed pulsation compensation, stable operation at ≤ 1 rpm

Wide Voltage Compatibility: Stable adaptation for 480V industrial power grid, strong tolerance to bus fluctuations

2. 000000 Basic Configuration Features

No Bus, Pure Hardwired Control: Analog / Pulse Commands, Compatible with Traditional PLC, Motion Controllers

Single Feedback Interface: Incremental Encoder or Rotating Transformer, Flexible Selection at the Site

Standard I/O Capable: 8DI/4DO Satisfy Basic Logic such as Limit Switches, Emergency Stops, Enable, Status Feedback, etc.

Built-in Regenerative Braking: No External Braking Drive Required, Cost Reduction and Wiring Simplification

Minimal Stable Architecture: No Complex Safety / Bus Functions, Low Fault Rate, Simple Debugging, Convenient Maintenance

3. 480V High Power Advantage

High Power Density: 20A / 480V Drive for 7.5 – 11kW Motors, Small Volume, High Power

480V Industrial Grid: Compatible with European and Domestic High Power Factory Grids, No Transformer Required

High Efficiency: High Voltage, Low Current, Low Line Loss, Low Heat Generation, Stable Long-Distance Wiring

Strong Overload Capacity: 3 Times Peak Current, Suitable for High Inertia, Heavy Load, Frequent Start-stop Scenarios

VII. Compatible Motors and Typical Applications

1. Compatible Kohmorgen Motors (480V 20A Class)

AKM Series: AKM63/72/73 (7.5 – 11kW, 480V)

Goldline XT Series: T206/T226 (20A Winding, 480V)

MT Series: MT604/702 (High Power 480V)

Third Party: 7.5 – 11kW, 20A RMS, 480V Class Brushless Servo Motors

2. Typical Application Domains (480V High Power No Bus Scenario)

Traditional Machine Tools: Heavy Lathes, Milling Machines, Grinding Machines, Presses (Simulation Quantity Feed Control)

Material Handling: Large Hoists, Winches, Cranes (High Torque Control)

Fans / Pumps: Precision Speed-Loop Fans, Water Pumps, Hydraulic Pumps (Speed Closed Loop)

Textile / Rubber: Large Printing Machines, Extruders, Injection Molding Machines (Tension / Torque Closed Loop)

Woodworking Machinery: Planers, Edge Gluing Machines, Engraving Machines (Pulse / Analog Positioning)

Metallurgy / Mining: Rolling Mills, Feeding Machines, Crushers (Heavy Load Stable Operation)

VIII. Installation and Commissioning Key Points

Installation: Vertical Wall Mounting, Smooth Airflow, Dust-Free and Non-corrosive Environment

Wiring: Power / Feedback / Control Shielded Separation (Distance ≥ 15cm), 360° Shielded Grounding

Power Supply: Three-phase 480V Stable, 24V Filtering, Braking Resistor ≥ 1.5kW

Commissioning: WorkBench Connect RS-232, Automatic Tuning, Parameter Configuration, Limit Switch / Emergency Stop Testing

Maintenance: Regular Dust Cleaning, Check Fans, Tighten Wiring

Safety: Power Off ≥ 10 Minutes Discharge, Prohibit Plugging and Unplugging while Powered

IX. Notes

SR20201-000000 is the SR Series 20A 480V Basic No-Bus Type Driver. The 480V high-power + basic hardware + no bus + built-in braking combination is highly compatible, highly stable and offers the best cost in traditional high-power automation systems. It is mainly suitable for spare parts, maintenance, upgrading of old equipment, and high-power busless devices in the market. It is a cost-effective and reliable choice for 7.5–11kW 480V servo systems. The parameters are based on the nameplate and the original factory manual. Installation and commissioning require professional electrical engineers to carry out.