Description
The FRIEM DRP-6T-H (often written in cyrillic variations as DRP-6T-Н) is a high-performance, microprocessor-based digital power regulator module engineered for the precise control and diagnostic monitoring of high-power current rectifiers. Derived from the legacy analog REGAS line, the DRP-Line concept provides high-accuracy closed-loop regulation for complex converter topologies, including six-pulse bridge and double-star configurations utilizing thyristors or diodes with saturable reactors. The module is widely deployed in demanding industrial applications requiring stable high-current DC power extraction, such as Chemical Vapor Deposition (CVD) poly-silicon reactors and hydrogen electrolysis plant infrastructure.
Technical Specifications
| Parameter | Value |
| Brand / Manufacturer | FRIEM |
| Model Number | DRP-6T-H / DRP-6T |
| Core Hardware Sub-Board | Typically paired with MC22-T Control Board |
| Regulation Architecture | Microprocessor-based multi-loop cascade structure (voltage/current/firing angle) |
| Supported Topologies | 6-Pulse Bridge, Double-Star with saturable reactors, Thyristor/Diode rectifiers |
| Local Interface Connection | Front-facing RS232 Serial Port (dedicated for PC setup) |
| Remote Network Ports | Independent RS485 Serial Interface or Fiber Optic lines |
| Communication Protocols | Modbus RTU, Profibus DP, Internal CANbus (for local I/O) |
| Diagnostic Capabilities | Full memory checksum execution, live oscillography, load profiling, event recording |
| Regulatory Standards | Fully compliant with IEC standards, CE Directives, and UL/CSA approval criteria |
| Physical Construction | Modular draw-out casing with compact footprint |
Procurement & Commercial Availability
- Condition: Available in New Original (Factory Sealed) or Tested Surplus configurations. Refurbished units undergo deep component checks and dynamic firing-loop verification before release.
- Warranty: 12-month industrial-grade hardware warranty from the date of system delivery.
- Lead Time: Standard stocked items package and dispatch globally within 1 to 3 business days.
- Pricing Notice: Market pricing fluctuates based on localized inventory depth and factory-embedded revision layers. Contact us directly for a formal, binding quote.
Field Commissioning & Operational Architecture
Cascade Loop Tuning and Constraints
The DRP-6T-H utilizes a high-speed internal cascade loop mapping algorithm. The outer loop manages output voltage setpoints, feeding directly into a fast inner current-limiting loop, which ultimately determines the thyristor firing gate angle (\alpha).
Field Programming Note: When commissioning the module for a double-star transformer winding array, ensure the primary synchronization inputs are shielded against harmonic notch distortion. The integrated Phase-Locked Loop (PLL) algorithm handles high THD, but tracking may fail if auxiliary synchronization voltage leads run parallel to high-current AC bus ducts.
Dual-Port Communication Routing
The module separates operational data layers using independent hardware ports:
- Front RS232 Port: Used exclusively for point-to-point parameter configuration, loading localized firmware modifications, and pulling internal diagnostic waveforms onto a technician’s laptop.
- Rear RS485/Fiber Optic Port: Handles live process commands from the plant DCS or PLC system using standard Modbus RTU or Profibus DP protocols. Keep these networks electrically isolated to prevent common-mode noise propagation into the micro-control layer.
System Safety & Protection Interlocks
The DRP-6T-H features integrated structural protections designed for high-availability systems, including a specialized bar-to-ground fault protection device and comprehensive self-diagnostics that scan internal RAM/Flash structures periodically. If a diagnostic mismatch or major feedback fault occurs, the module executes an immediate controlled angle ramp-down sequence or switches instantly to secondary backup signal sensors to protect the SCR cells from sudden thermal shock.
Frequently Asked Questions
Can the DRP-6T-H directly retrofit an older analog REGAS system?
Yes. The DRP-Line was engineered specifically to facilitate system upgrades and panel revampings. However, because the DRP-6T-H requires digital communication setup and digital signal mapping, you must verify the existing wiring schemes for the thyristor pulse transformers and adapt any legacy analog setpoint loops to Modbus or Profibus registers.
What is the function of the MC22-T sub-card on this unit?
The MC22-T is the primary digital processing and logic execution control board installed within the DRP housing. It contains the microcontroller, memory components, and firing-pulse generation logic required to synchronize gating sequences with the supply grid frequency.
How do we extract event records and load profiles from the unit?
Event records and integrated oscillography files are stored in the module’s onboard non-volatile memory. These logs cannot be viewed directly through basic PLC registers; you must connect a laptop to the front RS232 port and utilize FRIEM’s proprietary Windows-based diagnostic software utility to download and analyze the binary event buffers.
