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IS200EXAMG1B - EXCITER ATTN MODULE ( Field Ground Detector)

4
Module manufactured by General Electric as part of the Mark VI/VIe Series used in gas turbine sppedtronic control systems
Product DESCRIPTION
Part Number
IS200EXAMG1B
Manufacturer
General Electric
Country of Manufacture
Per GE Manufacturing Policy
Series
Mark VI/Vie
Function
Module
Availability
In Stock
services we provide
Testing & Repair
Repair and Testing of circuit boards to diagnose ensure functionality to maintain current inventory and retain obsolete circuit boards/modules.
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TECHNICAL SPECIFICATIONS FOR GE - IS200EXAMG1B
IS200EXAMG1B is an Exciter Attenuation Module designed by General Electric as a part of EX2100 used to control the excitation control systems. The EXAM combined with exciter ground detector module IS200 EGDM provides the ground detection systems for the EX2100 excitation control. The EXAM mounts in the high voltage interface (HBI) module that is located in the accelerated cabinet.

IS200EXAMG1B Functional Description
It provides attenuation between the field bus and the EGDM by sensing high voltage from the bridge and scaling the voltage to a usable level. The EXAM and EGDM(s) are connected through the exciter power backplane IS200 EPBP. A single 9-pin cable connects the EXAM to the EPBP. The EGDM(s) plugs into the EPBP through a 96-pin connector. Only one EXAM is requested for simplex and triple modular redundant applications and the interconnection is the same. The EXAM does not include any test points, fuses, or LED indicators. The module includes two plug connectors, two stab-ON connectors, a ground connection terminal, and three adjustable jumpers.
A set of three EGDMs is configured as the controller (C), Master 1 (M1), and Master 2 (M2) in TMR applications (M2). Each EGDM is automatically configured via the program pins of the EPBP's 96-pin P2 connector. The DSPX board sends information to EGDM C about which master supplies the 50 V ac square-wave signal to the sense resistor in the EXAM. If M2 is the master, EGDM C either powers the relay in the EXAM or leaves it unpowered if M1 is the master.
At the same time, a differential signal indicating the selected master is sent to M1 and M2. This signal activates the active master's signal generator and selects the test command source on each EGDM (M1, M2 and C). The active master sends to the EXAM a positive or negative 50 V ac square-wave signal that is applied to one end of the sense resistor (Rx).
Connector J2 sends the square wave signal to the EXAM and receives the sense resistor signals from the EGDM. During field flashing, the square wave signal is removed.
The field voltage (Vbus+ and Vbus) ranges from 125 V dc to 1000 V dc, and the power potential transformer (PPT) voltage ranges from 120 to 1300 V ac rms. The EXAM has two filter capacitance variations that can be selected using jumpers JP1 and JP2.
PPT voltages below 750 V rms
PPT voltages in excess of 750 V rms
IS200EXAMG1B Board Replacement
To replace the board in a PGDM module

Be sure all sources of power including both the PGDM and the protected excitation equipment have been de-energized.
Open the auxiliary cabinet door, and using equipment designed for high
Test any electrical circuits before touching them to ensure that power is off.
Carefully disconnect all cables from the EXAM board
Carefully unseat the board from the mounting pins and remove the board from the Glastic bracket
Verify that the jumpers JP1 JP3 on the new EXAM module are correctly set, as they were on the original board.
Firmly secure the replacement board to the glastic bracket.
Reconnect any disconnected cables.
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