Description
ABB LIMELITE2000 AMPLIFER DMK12A
Introduction to ABB LIMELITE 2000 AMPLIFER DMK12A Servo Power Amplifier
ABB LIMELITE 2000 DMK12A is a digital servo power amplifier in ABB’s industrial automation product line, belonging to the LIMELITE 2000 series. Its core function is to provide precise current drive for permanent magnet synchronous brushless AC servo motors, achieving high dynamic response position, speed, and torque control. It is the core power level component of ABB’s early motion control platform, which has been widely used in single machine equipment in industries such as packaging, textiles, printing, food and beverage, and electronics manufacturing. Currently, it has gradually been replaced by new generation servo drives such as ACS880 and MotiFlex e180/e190, but it is still operating in a large number of storage devices.
ABB LIMELITE2000 AMPLIFER DMK12A
core positioning
The module itself does not execute motion control algorithms or collect position feedback, but exists as a “power execution stage” – receiving speed or torque given signals from upper level motion controllers (such as PLCs, dedicated motion controllers), outputting three-phase sine currents to the servo motor winding after internal digital PWM conversion, while monitoring motor current, bus voltage, and module temperature in real time, and triggering protection in case of abnormalities. The core difference between it and a frequency converter is that it optimizes the current loop bandwidth and dynamic response for servo applications, supports encoder feedback closed-loop instead of simple V/F open-loop control.
Basic Parameters
Material Number: DMK12A/LIMELITE 2000 DMK12A
Model: DMK12A (“12” represents rated continuous output current of approximately 12A)
Series: LIMELITE 2000
Type: Digital servo power amplifier/servo driver power stage
Applicable motor: Permanent magnet synchronous brushless AC servo motor (PMSM)
Rated output current: 12A continuous (peak value can reach 2-3 times the rated value, lasting for a few seconds)
Input power supply: three-phase 400V AC 50/60Hz (some configurations support single-phase 230V AC)
DC bus voltage: approximately 540V DC (three-phase 400V input rectified)
PWM switching frequency: usually 8-16kHz
Current loop bandwidth: approximately 1-2kHz (typical value, depending on motor parameters and gain settings)
Control inputs: analog speed setting (± 10V), analog torque setting (± 10V), pulse command (optional)
Feedback interface: Incremental encoder A/B/Z phase input (TTL level, supports up to several MHz frequencies)
Digital I/O: Multiple digital inputs (enable, direction, quick stop, etc.)+digital outputs (ready, fault, alarm, etc.)
Communication interface: Some configurations support RS-485/Modbus for parameter reading and status monitoring
Electrical isolation: isolation between control side and power side, isolation between encoder input and power side
Protection level: IP20 (installed inside the control cabinet)
Working temperature: 0 ° C to+40 ° C (derating can be used up to+50 ° C)
Installation method: DIN rail or panel embedded installation
Size: Approximately 150mm x 100mm x 80mm (estimated, depending on version)
Weight: Approximately 1.5kg to 2kg
Main functional features
High dynamic current control: The internal digital PWM controller achieves fast current loop response, with a current loop bandwidth of over 1kHz, making the response time of the servo motor extremely short during speed steps and load changes, suitable for scenarios that require fast start stop and precise positioning.
Multi mode operation: supports speed mode, torque mode, and position mode (position mode requires cooperation from the upper controller). Accept analog or pulse settings in speed mode; Directly controlling the motor output torque in torque mode is suitable for applications such as tension control and press fit.
Encoder interface: Onboard incremental encoder input channel (A/B/Z three-phase), supports TTL level encoder, can handle pulse frequencies up to several MHz, and works with motor encoder to achieve full closed-loop speed and position control.
Complete protection functions: overcurrent protection (instantaneous and continuous), overvoltage protection (bus voltage exceeding limit), undervoltage protection (power drop), over temperature protection (module heat sink temperature exceeding limit), short circuit protection (output terminal short circuit), encoder loss protection (safe shutdown in case of abnormal feedback signal). All faults are reported through the digital output port for quick response by the upper system.
Analog input and feedback: Both speed and torque are given using ± 10V analog input, with high linearity and strong anti-interference ability. Some configurations provide analog speed feedback output, which can transmit the actual speed back to the upper controller for cascade control or monitoring.
Parameterized configuration: Set key parameters such as current loop gain, speed loop gain, acceleration/deceleration time, current limit value, etc. through panel potentiometer or upper communication interface (RS-485/Modbus), and the configuration takes effect in real time without power outage.
Start self check: Automatically detect encoder connection, bus voltage, IGBT status when powered on, lock output and report faults when abnormal, to prevent motor loss of control or mechanical damage caused by misoperation.
Comparison with products in the same series
DMK12A (12A version): Rated continuous current of 12A, suitable for driving servo motors ranging from 0.4kW to 0.75kW, it is the main model in the small and medium power range of the LIMELITE 2000 series.
DMK25A (25A version): Rated continuous current of 25A, suitable for motors ranging from 1kW to 2kW. The power level doubles, and the volume and heat dissipation requirements also increase accordingly.
DMK50A (50A version): Rated continuous current 50A, suitable for 3kW~5kW level motors, belonging to high-power version.
ACS880: ABB’s current main servo drive integrates power level, control algorithm, and communication, supporting modern buses such as EtherCAT and PROFINET. DMK12A has been fully replaced by it.
MotiFlex e180/e190: ABB’s new generation compact servo drive supports HIPERFACE DSL one cable solution and EtherCAT communication, outperforming LIMELITE 2000 in performance and usability. However, DMK12A still has irreplaceability in old projects due to spare parts compatibility.
Typical application scenarios
Packaging Machinery: Servo shaft drive for sealing and labeling machines, fast start stop and precise positioning are core requirements, and DMK12A’s high dynamic current loop can meet the beat requirements.
Textile machinery: warp tension control, servo drive of feed rollers, precise tension control in torque mode operation to prevent yarn breakage.
Printing Machinery: Color registration servo, paper cutting shaft drive, achieving high-precision color registration in position mode, ensuring paper cutting synchronization in speed mode.
Food and beverage: filling machine servo bottle pushing, sealing machine spindle drive, IP20 protection with control cabinet sealing to adapt to humid environments.
Electronic manufacturing: PCB drilling machine, surface mount machine X/Y-axis servo drive, high dynamic response ensures machining accuracy and efficiency.
