IS200EXAMG1A GE EX2100, Exciter Attenuator Module

Description:

IS200EXAMG1A is an Exciter Attenuator Module. IS200EXAM Exciter Attenuation Module (EXAM), combined with the IS200EGDM Exciter Ground Detector Module (EGDM), provide the ground detection system for the EX2100 Excitation Control. The EXAM mounts in the High Voltage Interface (HVI) module that is located in the auxiliary cabinet. 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 IS200EPBP Exciter Power Backplane (EPBP). A single 9-pin cable connects the EXAM to the EPBP. The EGDM(s) plugs into the EPBP through a 96-pin connector, P2. Only one EXAM is required for simplex and triple modular redundant (TMR) applications and the interconnection is the same.
The field voltage (Vbus+ and Vbus−) varies from 125 V dc to 750 V dc and the ac line-to-line voltages (PPT) vary from 120 to 1000 V ac rms.
The EXAM has two variations of filter capacitance that are selectable through jumpers JP1 and JP2.
• PPT voltages less than 750 V rms
• PPT voltages greater than 750 V rms
With the field ground test activated, the bus voltage is distributed across the attenuation resistors (RA1 ñ RA4) and sense resistors (Rx, Ry, Rz). The test can last up to 10 seconds. With an ac bus dead short to ground, the entire bus voltage will be present across a single section of the attenuation resistors. In the event of a dead
short, a fault is generated and the unit is shut down within 10 seconds. The activation for the field ground test and master selection is controlled by the EGDM. The EGDM controls a relay located on the EXAM. The relay has a 24 V dc coil with diode suppression and requires less than 20 mA to operate. The default state for the relay is de-energized and feeds back to M1. An energized relay will feed back to M2.

Datasheet Link:

IS200EXAMG1A GE EX2100, Exciter Attenuator Module PDF Datasheet