SIEMENS 6DD2920-0AL0 (AUL2) Thyristor Trigger Monitoring Logic Module

Siemens 6DD2920-0AL0 (AUL2) Thyristor Trigger Monitoring Logic Module
I. Basic Classification
Full model: 6DD2920-0AL0
Internal code: AUL2 (Ansteuerungs-Bewachungs-Logik – Trigger Monitoring Logic)
Compatible platform: SIMADYN D high-power drive control system
Installation rack: SAV21, SAV22 standard cabinets, backplane bus communication

Core Function Positioning
Designed specifically for thyristor rectification / inversion in high-power drive systems, with two core responsibilities:
Thyristor pulse triggering control
Output high-precision synchronous triggering pulses to control the conduction of large-power thyristor bridge arms, suitable for DC speed regulation and AC-AC frequency conversion high-power drive systems; the pulse phase and width are issued by the system CPU, and AUL2 precisely outputs the timing sequence.
Full-loop fault monitoring and protection
Real-time monitoring of thyristor status, pulse circuit, power unit short circuit, missing pulse, thyristor breakdown, phase anomaly; once a fault occurs, it immediately reports to the PM6 master control CPU and executes pulse blocking, trip interlock protection to prevent power components from exploding.

Hardware Electrical Parameters
Power supply: 24VDC ±10%, fed by the backplane of the rack
Weight: Approximately 0.5kg, standard SIMADYN D card size Work environment
Temperature: 0℃ ~ +60℃ for full-load operation; wide temperature model – 20℃ ~ +60℃
Protection grade: IP20, installed in the cabinet
Certifications: CE, UL industrial safety certification
Interface terminal layout
X1/X2/X3/X4/X5/X6 multiple groups of D-Sub interfaces: trigger pulse output, power unit feedback sampling, synchronous voltage sampling
X7 green terminal: 24V power supply, hardware enable, fault hard interlock signal
Panel LED array: power, operation, normal pulse, fault indicator lights for each path, intuitive diagnostic status
Signal channels: multiple independent trigger outputs + multiple status feedback acquisition, single module can control one group of high-power rectifier bridge
Four. System configuration

Main control CPU: PM6 processor module (SIMADYN D core computing unit)
Communication buffer: MM4 multi-processor data interaction board
This module: 6DD2920-0AL0 (AUL2) trigger monitoring
Peripherals: large power thyristor power cabinet, current and voltage transformers, excitation unit
Programming software: STRUC (SIMADYN D dedicated configuration programming tool), configure pulse parameters, fault thresholds, protection logic
Five. Typical application scenarios
Steel and metallurgy: cold and hot rolling main drive, DC speed regulation of rolls, AC-DC frequency conversion system for large roll-up machines
Power energy: large synchronous motor excitation regulation, high-power frequency drive, rectifier excitation of generator sets
Heavy industry: mine hoist, main propulsion drive of ships, DC speed regulation of large extrusion machines
All megawatt-level high-power drive units relying on thyristor power bridges
Six. Spare parts market information
Original factory condition: The SIMADYN D old platform has been discontinued, new original equipment is very rare
Mainstream supply sources: disassembled original equipment, professional maintenance refurbished parts, support for detection, replacement of capacitors, repair of pulse channels
Series differentiation
6DD2920-0AH0: old version AUL1 basic model
6DD2920-0AL0: optimized version AUL2, stronger anti-interference, higher fault diagnosis accuracy, a common replacement model available on the market
Interchange conditions: the same SAV21/SAV22 rack, slight adaptation of program configuration is sufficient for compatibility and replacement