IS200EHFCH2A GE EX2100, EXCITER FAN CONTROL

Description:

FUNCTIONAL DESCRIPTION:

The IS200EHFCH2A is a Thyristor Control Fan Controller Board, meticulously crafted and engineered by General Electric, specifically designed for the EX2100 Series utilized in Excitation Control Systems. In conjunction with the Gate Pulse Amplifier (EHPA) board within the EX2100 TM 100 mm Thyristor Control applications, the optional IS200EHFCG1A Fan Control (EHFC) board can be affixed to the EHPA board. Each power converter within the 100 mm category features an EHPA strategically positioned near the top front of the device. Depending on the distinct application requirements, there may be two, three, or four power converters present. Positioned atop each power converter are one or two cooling fans, with a single fan being the most cost-effective option available. However, it is important to note that a generator failure does not occur if this fan malfunctions; it solely impacts the power converter segment. To uphold a full output rating even in the event of a single power converter section's failure, the 100 mm thyristor control can incorporate n+1 or n+2 power converter redundancy.

Furthermore, the 100 mm thyristor control configuration allows for the inclusion of two fans per power converter section. This architectural choice introduces redundancy at the fan level, as either fan possesses the capability to operate at the full converter rating. Should either fan encounter a failure, it can be seamlessly replaced online without any detrimental effect on the output of the respective power converter section.

In all 100 mm thyristor control scenarios that feature two fans per power converter section, the EHFC is typically provided, orchestrating the fans in a lead/lag sequence. The designated active (lead) fan assumes the responsibility of cooling the power converter. To guarantee adequate cooling, the backup (lag) fan springs into action upon the lead fan's failure. The EHFC offers a comprehensive suite of standard functionalities, including:

- Automatic initiation of the lead fan upon the EX2100's activation.
- Automated testing of the lag fan every time the EX2100 is initiated.
- Instantaneous transfer to the lag fan in the event of lead fan failure.
- Routine automatic testing of the lag fan during EX2100 operation, either on a weekly or daily basis.
- Facilitated lead/lag fan swapping (transitioning to the idle fan) via a local manual pushbutton or a remote source like VersaMaxTM I/O.
- Automated reporting of fan failures to the EX2100 control system.
- Automatic shutdown of the power converter portion in the scenario of dual fan failure.
- Optional automated fan deactivation when the EX2100 is switched off and the power converter temperature falls below 50 °C (122 °F).
- An intelligent sequencing protocol ensuring that both fans never activate simultaneously, thereby mitigating peak current demands on the fan power supplies.
- Independent EHFC controllers for each power converter segment, enhancing redundancy and exciter availability.
- Manual fan testing capabilities utilizing a local pushbutton or a distant source while the EX2100 remains offline.

APPLICATION DATA:

This segment furnishes exhaustive details regarding EHFC interfaces, configuration parameters, diagnostic procedures, and operational behavior. For a comprehensive understanding of the EHFC board's layout, including mounting apertures, connectors, configuration jumpers, and indicator lights, refer to the diagram presented below.

JUMPERS:

The configuration of the EHFC's jumpers adheres to the schematics depicted in the accompanying tables. It is imperative to recognize that the setting of EHPA jumper JP2 (NCMODE) also exerts influence on EHFC operations. The Hall effect speed sensor can be supplanted by a normally closed contact input through the manipulation of this jumper. As a standard practice, the Hall effect sensor is deployed across all EX2100 applications, necessitating that JP2 be configured in the default 1-2 position. Refer to GEI-100532 for supplementary information on EHPA.

OPERATION:

To minimize stress on the fan power supply during startup, it is crucial to avoid simultaneous activation of both fans. There must always be a minimum five-second interval between closing the starters. Unless JP2 is configured for continuous operation, the fans will not activate automatically upon power-up. The only exceptions to this rule are instances involving SCR bridge gating or a Transfer instruction. When the Transfer button is momentarily depressed, assuming lead/lag mode is engaged, the lag fan initiates and undergoes testing. Following a successful start within five seconds, an alarm is triggered and communicated to the control system if unsuccessful. After a five-second delay, the lead fan commences and is subjected to testing. Should both fans pass the test, they are powered down post-test unless JP2 is set for continuous operation or the bridge temperature exceeds 50 °C (122 °F). If both fans clear the test, their lead/lag designations are reversed, and the new lag fan assumes priority during the subsequent Start or Transfer cycle.

The fan activation sequence mirrors the previously outlined process when initiating the exciter to gate the bridge. In dual mode, the lag fan or fan 2 begins first and undergoes testing. Subsequently, the lead fan or fan 1 is activated and assessed. If the lead fan starts successfully in lead/lag mode, the lag fan ceases after ten seconds. Should the lead fan fail to start, the lag fan continues its operation unabated, and control is promptly notified of fan failures. Post-test, both fans must remain operational in dual mode, whereas a single operating fan suffices in lead/lag mode. In the event of dual fan failure, the bridge executes a closure within approximately 20 seconds.

Datasheet Link:

IS200EHFCH2A GE EX2100, EXCITER FAN CONTROL PDF Datasheet