Description
The ABB OKYM175W22 is a specialized control and firing module used within high-power rectifier systems and excitation equipment. It is designed to manage the precise timing and firing pulses required for thyristor-based power conversion stacks.
Product Parameters (Datasheet)
- Model Number: OKYM175W22
- Device Category: Control and Gate Firing Module
- Compatibility: ABB High-Power Rectifiers (HPR), Excitation Systems (UNITROL series)
- Pulse Generation: High-energy gate firing pulses for large power thyristors
- Inputs: Control signals from the main processor (typically via fiber optics or ribbon cable)
- Protection: Integrated dv/dt protection and monitoring for the thyristor gate circuit
- Mounting: Rack-mount or sub-chassis installation
- Cooling: Passive or forced-air, depending on the enclosure design
ABB OKYM175W22
ABB OKYM175W22
Country of Origin
This component is manufactured by ABB in Switzerland, specifically engineered at their power electronics center of excellence for heavy industrial applications.
Application Fields
The OKYM175W22 is critical for controlling high-current electrical flows in:
- Aluminum Smelting: Managing the massive DC currents required for electrolysis.
- Large Synchronous Motors: Providing the excitation current for motor starting and regulation.
- Chemical Production: Precise control of power for chlorine and sodium hydroxide production.
- Mining Operations: Powering large DC hoists and grinding mills.
Product Usage Instructions
- ESD Precautions: This module contains sensitive semiconductor components. Always wear a grounded ESD wrist strap during handling and installation.
- Cable Inspection: Check the integrity of the firing pulse cables and control ribbons. Ensure connectors are clean and free of oxidation.
- Mounting: Secure the module into its designated slot. Poor mechanical contact can lead to improper grounding and signal noise.
- Voltage Check: Verify that the supply voltage to the module matches the system requirements (typically 24V DC for logic) before powering up the entire stack.
- Timing Calibration: When replacing a module, ensure that the firing angle (α) is synchronized with the rest of the phase-controlled bridge to prevent current imbalance.
Product Technical Description
The OKYM175W22 functions as the final stage of the control loop. Technically, it translates the low-level logic commands from the system controller into high-energy electrical pulses capable of triggering the gate of large-area power thyristors. It ensures that each thyristor is fired at the exact millisecond required to maintain a stable DC output or excitation field. The module features robust galvanic isolation to separate the sensitive low-voltage control electronics from the high-voltage power side of the rectifier.
Q&A (Common Questions)
Q: What causes a “Firing Failure” alarm on this module? A: This is often caused by a disconnected gate cable, a failed thyristor gate junction, or a lack of supply power to the pulse-generating circuit.
Q: Can I swap an OKYM175W22 with a different W-version? A: No, the W-suffix (e.g., W22) usually indicates a specific power rating or pulse characteristic. Substituting a different version can lead to firing errors or damage to the power semiconductors.
Q: Does this module require specialized software? A: No, the OKYM175W22 is a hardware-driven firing board. Configuration is usually handled at the central controller level (e.g., AC800PEC).
Q: Is there an LED status indicator? A: Most versions include a “Status” or “Pulse” LED that flickers in proportion to the firing frequency. A steady red LED typically indicates an internal fault.
Similar Model Recommendations
- ABB OKYM175W21 (Related firing module variant)
- ABB 3BHE022293R0101 (Power supply for control modules)
- ABB GVC750BE101 (Central control unit)
- ABB SD832 (Power supply module)
- ABB 3BHE009681R0101 (AC800PEC Controller)
For more information on the ABB OKYM175W22 and high-power electronics spare parts, please contact our technical support team.
