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The GE IS200EXAMG1BAA Exciter Attenuation Module (EXAM) is part of the EX2100 excitation control ground-detection system, where it conditions field bus voltages to safe, measurable levels. The GE IS200EXAMG1BAA integrates with related cards such as IS200EGDM and mounts in the auxiliary control cabinet of 35 A and 120 A regulator systems. Through configurable jumpers, the GE IS200EXAMG1BAA can be adapted to different potential transformer (PPT) secondary voltages, improving flexibility for various generator field configurations.

Model GE IS200EXAMG1BAA Exciter Attenuation Module (EXAM)

System series EX2100 / EX2100e excitation control, Mk VI / IS200-series hardware

Function Ground-fault detection support, field bus voltage attenuation and conditioning

Mounting location Auxiliary control cabinet within the EX2100 / EX2100e excitation system

Temperature range Typically 0 to 60 °C (cabinet environment, convection-cooled)

Main connectors J1: 3-pin locking connector to field flashing relay aux contact; J2: 9-pin D-sub test/relay/leakage monitor; E1/E2 stab-on for field bus voltages; TB1 shield-to-chassis ground terminal

Configuration Jumpers JP1, JP2, JP3 to match PPT secondary voltage ranges (various field PT options)

Indicators/fuses No on-board LEDs, testpoints, or fuses; relies on system-level diagnostics

Verify that the GE IS200EXAMG1BAA part number and revision match the EX2100/EX2100e design documents for your excitation panel.

De-energize the excitation system, lock out/tag out the generator field and associated control power before handling the GE IS200EXAMG1BAA.

Mount the GE IS200EXAMG1BAA in the designated auxiliary cabinet location or card slot according to the panel layout drawing.

Connect the field bus voltage leads to stab-on terminals E1 and E2 on the GE IS200EXAMG1BAA, ensuring correct polarity and insulation rating.

Wire connector J1 from the GE IS200EXAMG1BAA to the field flashing relay auxiliary contact and J2 to the ground-detection test/relay/leakage-monitor circuit as shown in the system wiring diagram.

Connect TB1 on the GE IS200EXAMG1BAA to cabinet/chassis ground to bond the board shield correctly.

Set jumpers JP1, JP2, and JP3 on the GE IS200EXAMG1BAA for the actual PPT secondary voltage used in your excitation system (e.g., 63.5 V, 120 V—refer to the EXAM table in the manual).

Re-energize the excitation system and run the EX2100 ground-detection commissioning or self-test procedure to confirm the GE IS200EXAMG1BAA is operating properly.

Handle the GE IS200EXAMG1BAA using anti-static practices (wrist strap, ESD mat) to avoid damage to sensitive components.

Always verify the field PT secondary voltage before setting jumpers on the GE IS200EXAMG1BAA; incorrect jumper settings can cause wrong scaling of ground-fault measurements.

Ensure E1/E2 stab-on connections on the GE IS200EXAMG1BAA are fully seated and properly crimped; loose field-voltage connections can lead to intermittent ground-fault indications.

Do not rely on the GE IS200EXAMG1BAA for general over-voltage protection; it is intended as an attenuation and detection interface within the EX2100 scheme.

Keep control wiring to J1 and J2 on the GE IS200EXAMG1BAA routed away from high-current buswork to minimize noise pickup in the ground-detection circuit.

During scheduled outages, visually inspect the GE IS200EXAMG1BAA for signs of overheating, discoloration, or damaged connectors and stab-on terminals E1/E2.

Verify that TB1 grounding for the GE IS200EXAMG1BAA is tight and corrosion-free to maintain a low-impedance shield-to-chassis connection.

Periodically confirm jumper settings (JP1–JP3) on the GE IS200EXAMG1BAA still match the installed PPT ratio, especially after any transformer or wiring changes.

Use the EX2100 or EX2100e diagnostic and ground-detection test functions to confirm the GE IS200EXAMG1BAA response is within expected limits (no spurious alarms, correct sensitivity).

If persistent ground-fault indications or abnormal readings occur and other causes are excluded, replace the GE IS200EXAMG1BAA with a qualified spare and re-test the excitation protection.

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