Features:
- Mounts in the auxiliary cabinet as the field-side ground-detector interface.
- Contains the sense resistor connected to the resistor network across the field.
- Switches between M1 and M2 detector sources under controller C in redundant systems.
A low-frequency +/-50 V square wave is applied to one end of the sense resistor.
Leakage current develops the voltage that returns to the paired EGDM channel.
One nine-conductor cable carries both control and sense signals between EXAM and EGDM.
For attenuator-loop purchasing and available GE references, Apter Power supports the General Electric IS200EXAMG1A Exciter Attenuator Module for GE EX2100 excitation-control service.
General Electric IS200EXAMG1A Exciter Attenuator Module Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Signal Attenuation for IS200EXAMG1A
- Field network: The sense resistor is connected within a resistor network across the generator field.
- Applied waveform: EGDM supplies a low-frequency square-wave test signal.
- Current response: A field-to-ground path produces current through the sense resistor.
- Measurement output: The resistor voltage is returned to EGDM for conditioning and monitoring.
EGDM Interface for IS200EXAMG1A
- Shared cable: A single nine-conductor cable carries drive, control and sense information.
- Source channels: The test signal can arrive from the M1 or M2 detector channel.
- Selection control: Controller C operates the source-selection relay on EXAM.
- Loop check: The selected source and returned measurement must remain on the same detector path.
Field-Side Wiring for IS200EXAMG1A
- Location: EXAM is installed in the auxiliary cabinet near the field-side network.
- Sense resistor: Both resistor connections must remain matched to the documented field circuit.
- Polarity: Field-side lead identity is retained when the module is disconnected.
- Clearance: Inspection covers insulation condition around the high common-mode sensing circuit.
Protection-Loop Test for IS200EXAMG1A
- Master selection: Command each available M1 or M2 source through controller C.
- Drive signal: Confirm the low-frequency test waveform reaches the EXAM resistor.
- Sense return: Verify that the developed voltage reaches the paired EGDM input.
- System result: Confirm the assigned controller receives and alarms the detector measurement.