Features:
- Detects field leakage resistance on the ac and dc sides of the generator field.
- Works with the EXAM sense resistor and a dedicated control-and-sense cable.
- Returns the conditioned measurement through a fiber-optic path to EISB.
Redundant controls use three EGDM modules assigned as Controller, Master 1 and Master 2.
P2 program pins establish the role of each module in the detector set.
The selected master generates the low-frequency drive used by the field-side sensing network.
Apter Power provides sourcing and available manufacturer-document support for the General Electric IS200EGDMH1A Exciter Ground Detector Module for GE EX2100 excitation-control service.
General Electric IS200EGDMH1A Exciter Ground Detector 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.
Ground Detection for IS200EGDMH1A
- Measured path: Field leakage resistance from the generator field circuit to ground.
- Excitation method: A low-frequency square wave is applied through the EXAM sense resistor.
- Return signal: EXAM returns an attenuated differential voltage to the detector module.
- Alarm path: The converted signal travels through EISB for DSPX monitoring.
EXAM Communication for IS200EGDMH1A
- Cable: One nine-conductor cable carries control and sense signals between EGDM and EXAM.
- Drive path: The selected EGDM master supplies the square-wave test signal.
- Sense path: Voltage developed across the EXAM resistor returns to EGDM.
- Isolation: The signal-conditioning supply is isolated for the high common-mode environment.
Channel Assignment for IS200EGDMH1A
- Controller role: The C module coordinates which master supplies the detector drive.
- Master roles: M1 and M2 provide redundant detector channels.
- Programming: P2 connector pins define each installed module assignment.
- Transfer: Controller C can command M2 when the M1 detector channel is unavailable.
Insulation Test for IS200EGDMH1A
- Preparation: Keep field-circuit boundaries and channel labels identified before testing.
- Cable check: Verify the EXAM control-and-sense cable on the assigned detector channel.
- Optical check: Confirm the oscillator command and measurement return on their correct fibers.
- Acceptance: Prove that the assigned DSPX channel monitors and alarms the applied test condition.