GE DS2020FECNRX001A | Field Excitation Board | New Original

Description

Product Introduction

The GE DS2020FECNRX001A functions as the Field Excitation Control (FECN) module within the Mark VIe control platform, providing integrated field excitation control with redundant firing channels for very small generator and permanent magnet generator (PMG) applications up to 1 A field current. This module interfaces with the Mark VIe controller via ISBus communication and offers 4 configurable analog inputs, 2 analog outputs, and dedicated field excitation outputs for controlling generator field current, voltage, and reactive power.

The model number breaks down as: FECN (Field Excitation Control), RX001 (1 A field excitation output rating with redundant firing channels), A (Revision A). The primary differentiator is the combination of redundancy and ultra-low current capacity—the RX001 provides redundant firing channels in a module designed for very small generators and PMG applications where even a brief loss of excitation would be unacceptable, but field current requirements are minimal.

Key Technical Specifications

Key Selling Points & Differentiators

• Redundancy with Ultra-Low Current: 1 A output with redundant firing channels—provides the highest reliability for the smallest generator applications.
• Compact, Cost-Effective Redundancy: The lowest-cost redundant excitation module in the Mark VIe family—ideal for applications requiring redundancy but limited by current requirements.
• Integrated Excitation Power Stage: Built-in 1 A SCR bridge and protection—eliminates the need for a separate excitation power module.
• Combined Excitation and Analog I/O: Integrated 4 analog inputs and 2 analog outputs—provides sensor inputs and control outputs without additional I/O modules.
• Comprehensive Field Protection: Overcurrent, overvoltage, under/over frequency, and field loss detection—provides complete protection for the generator field.
• Field Diagnostics: Field current and voltage monitoring, bridge health assessment, and SCR health monitoring—enables predictive maintenance.
• Full Live Test Certification: Each unit undergoes a 24-hour burn-in with full field output simulation (1 A), analog I/O verification, ISBus communication testing, redundancy switchover validation, and protection feature verification. We log the MAC ID, calibration data, and diagnostic baselines for traceability.
• Direct Drop-In Replacement: Form-fit-function compatible with DS2020FECNRX001 and earlier FECN revisions. Existing wiring and terminal assignments remain unchanged.
• 90-Day Warranty: Includes technical support and cross-ship replacement within 24 hours if the module fails to provide excitation output, reports incorrect analog values, protection circuits fail to operate, diagnostics report false faults, or redundancy switchover fails.

Frequently Asked Questions (FAQ)

Q1: What’s the difference between the DS2020FECNRX001A and the DS2020FECNRP005A?

The RX001A provides 1 A output with redundant firing channels, while the RP005A provides 5 A output without redundancy. The RX001A is designed for very small generators and PMG applications where redundancy is critical but current requirements are minimal. The RP005A is for small generators where cost is the primary consideration and redundancy is not required. Choose RX001A for critical small applications (e.g., emergency PMG, critical auxiliary generator). Choose RP005A for non-critical small generators.

Q2: What applications are best suited for the FECNRX001A?

The RX001A is ideal for: (1) PMG excitation systems where the PMG provides field power but loss of excitation would cause a loss of power, (2) Very small emergency generators (under 2 MW) where reliability is critical, (3) Auxiliary generators in critical facilities (hospitals, data centers) where redundancy is required, (4) Applications with limited space where a compact redundant module is needed, and (5) Any application where field current requirements are under 1 A but redundancy is mandatory.

Q3: What’s the maximum generator size (MW) for the FECNRX001A?

The maximum generator size depends on the field current requirement at rated load. The RX001 provides 1 A continuous. For a typical generator, field current at rated load is approximately 1-2 A per MW (for brushless excitation systems) or 2-4 A per MW (for static excitation systems). As a general guideline, the RX001 is suitable for generators up to 0.5-1 MW. It’s most commonly used for PMG exciter applications, not for main generators. For PMG applications, the field current is typically 0.2-1 A, making the RX001A the ideal choice.

Q4: Does the FECNRX001A require external cooling?

No. At 1 A output, the module generates minimal heat (approximately 3-5 W). Natural convection is sufficient. The module does not include a fan. Ensure adequate airflow in the cabinet (at least a few CFM) and maintain ambient temperature below 50°C. This module can be installed in a sealed cabinet without additional cooling.

Q5: How does the redundancy (dual-channel firing) work in the RX001A?

The RX001A has two independent firing channel circuits (Channel A and Channel B) that generate the SCR gate drive signals. Under normal operation, Channel A is active and Channel B is in standby. The module continuously monitors the firing pulse integrity (pulse amplitude, timing, and shape). If the module detects a firing failure on Channel A—such as a gate drive component failure, shorted output, or loss of pulse integrity—it automatically switches to Channel B within 5 ms. The switchover is seamless to the field control loop—the field current is not interrupted. The module logs the switchover event and reports the active channel status via ISBus.

Q6: Can I use the FECNRX001A for a PMG excitation system with a 0.5 A field current?

Yes. The RX001A is ideally suited for PMG applications. The 1 A capacity provides ample headroom for 0.5 A field current. The module’s voltage regulator mode is typically used for PMG systems to maintain terminal voltage. The redundant firing channels provide the reliability required for critical PMG applications where a loss of excitation would cause a power interruption.

Q7: What’s the typical lead time for the FECNRX001A, and do you recommend stocking spares?

The FECNRX001A is a specialized, lower-volume module—we maintain 3-5 units in inventory. Standard lead time for orders of 1-3 units is 1-2 weeks due to the specialized redundancy testing. For critical PMG applications, we recommend stocking one spare module per site. If you have a fleet of 10+ small generators or PMG applications, a 10% spare ratio is standard practice. If you need immediate delivery and the RX001A is out of stock, consider the RP005A as a substitute—it has higher current capacity (5 A) but lacks redundancy. Call our support line for expedited options.

XYCOM 4870
XYCOM 4850
XYCOM 4810
XYCOM-4150