IS200EACFG2B

IS200EACFG2B is an Exciter AC Feedback Board manufactured and designed by General Electric as part of the EX2100 Series used in Excitation Control Systems. The IS200EACF Exciter AC Feedback board (EACF) measures the exciter PPT AC supply voltage and current in the EX2100 Excitation Control. The terminal board contains transformers for a three-phase voltage measurement and terminals for two Flux/Air core coils. The outputs of the voltage and current circuits are fanned out to three DB9 connectors for cables to controllers M1, M2, and C. The cable between EACF and the EBKP backplane board can be up to 90 m in length. The EACF board is located in the exciter auxiliary cabinet.

There are three versions of the board, EACFG1 for inputs up to 480 V rms, EACFG2 for inputs up to 1000 V rms, and EACFG3 for inputs up to 1300 V rms. Revision EACFG3BAA and later are rated for inputs up to 1400 V rms. High-frequency noise suppression near the point of signal entry is provided for the flux/air core input signals. Cable shield terminal screws attached to the chassis ground are located within three inches of the input screws where applicable.

Exciter Voltage Measurement:

• The G1 version supports a single three-phase input voltage in the nominal range up to 480 V rms +20% at 50/60 Hz.
• The G2 version supports a single three-phase input voltage in the nominal range up to 1000 V rms +20% at 50/60 Hz.
• The G3 version supports a single three-phase input voltage in the nominal range up to 1300 V rms +20% at 50/60 Hz (1400 V for revision BAA and later).
• The potential transformers on both boards supply a nominal 1.6 V rms from their secondary outputs.
• The nominal secondary output voltage range of the air core current transformers is 0 to 0.8 V rms at 50/60 Hz.

Application Data:

• The layout of the EACF board includes T1 through T4, which are the three-phase voltage transformers.
• Individual screw connectors TB1, TB2, and TB3 are for the voltage inputs. Terminal block TB4 is for wiring from the two Flux/Air core coils.
• The three 9-pin sub-D connectors, J504, J509, and J514 are for cables to the EBKP backplane for the EMIO boards.
• Voltage test rings TP1-4 are for measuring the phase voltage output from the potential transformers as follows:
  • Between TP1 and TP2, obtain Phase to Phase (or Line) Voltage AB.
  • Between TP3 and TP4, obtain Phase to Phase Voltage BC.
  • Between TP4 and TP1, obtain Phase to Phase Voltage CA.