Fast Quote
General Electric IS200EGPAG1A is an Exciter Gate Pulse Amplifier Board for EX2100 power conversion modules built with 77 mm or smaller thyristors. It receives six gate commands from the ESEL board and produces the amplified pulses needed to fire the six bridge SCRs.
One IS200EGPAG1A is assigned to each applicable power conversion module. A nominal 125 V dc feed from the EPDM reaches the board, where an onboard dc-to-dc converter develops the gate-pulse power required by the amplifier circuits.
In addition to pulse amplification, IS200EGPAG1A participates in SCR conduction, airflow and bridge-temperature monitoring. Output-firing, bridge-current, gate-supply, line-filter, fan and temperature indications give technicians distinct checkpoints while tracing a missing firing pulse or a bridge alarm.
The IS200EGPAG1A design also supports two retrofit thermal switches mounted on the heat sink: one provides an alarm at 76 C and the second initiates a trip at 87 C. That thermal-switch provision and the 77 mm-or-smaller bridge assignment are important distinctions when comparing EGPA with the EHPA hardware used on 100 mm bridges.





