GE IS200EAUXH1A Exciter Auxiliary Interface Board

GE IS200EAUXH1A Exciter Auxiliary Interface Board

Functional Description

The IS200EAUXH1A (EAUX) board uses a HSSL to interface the UCSx controller to the following modules and

functions:

• 41DC contactors

• 53A and 53B field flashing relays

• 86G contact input

• De-excitation and crowbar functions

• Field voltage and field current feedbacks

• Field ground detection interfacing with the EXAM

• Bridge ac input feedbacks

• Conditioning of signals from power source monitors

Crowbar and de-excitation status signals from the EDEX are conditioned on the EAUX. Three contact inputs

from the 41DC contactor and 53A and 53B relays are powered (wetted) by 125 V dc on the EAUX. Power for

the contacts is supplied from the M1 and M2 power supplies or only the M1 (simplex). The EAUX interfaces

with the EXAM to support the field ground detector functionality. The EXAM senses the voltage across the

ground resistor and sends the signal to the EAUX through a nine-conductor cable. The EAUX and EXAM work

together to detect field ground leakage current. The EXAM is located in the auxiliary cabinet. Refer to the

EX2100 and EX2100e Excitation Control Exciter Attenuation Module (EXAM) Instruction Guide (GEI-10509).

The EAUX interfaces with the M1, M2, and C CSLA control boards through HSLA boards. The EAUX is

available in two groups (versions). Both groups accept the EAUD daughterboard, which converts the 41DC

interface from a standard 125 V dc coil driver mode to a high-speed contactor interface used in some

EX2100e control systems. For further details, refer to the EX2100e Excitation Control Auxiliary Interfaces

(EAUX) Board Instruction Guide (GEI-100779).

Technical Specifications