IS200EHPAG1DAB GE EX2100, Exciter Gate Pulse Amplifier Board

Description:

Functional Description
The IS200EHPAG1DAB, developed and designed by General Electric, is an Exciter Gate Pulse Amplifier Board that forms part of the EX2100 Series used in GE's Excitation Control Systems. Specifically, it is a component of the 100 mm EX2100™ Excitation Control system. The IS200EHPA Gate Pulse Amplifier Board (EHPA) processes gate commands from the ESEL to manage the firing of up to six Silicon Controlled Rectifiers (SCRs) on the Power Bridge. Additionally, it serves as an interface for monitoring current conduction, bridge airflow, and temperature. The functional model of the EHPA, highlighting its primary inputs and outputs, is illustrated in the accompanying diagram. Powered by a 125 V DC nominal source from the EPDM, the board features an onboard DC/DC converter to support SCR gating across the entire input voltage range. Status indicators, in the form of LEDs, provide visual feedback on various parameters, including EHPA power supply health, input gate commands from ESEL, SCR output signals, bridge current, line filter status, cooling fan operation, bridge temperature, alarms, and fault conditions.

Gate Command Inputs
The EHPA receives six gate commands from the ESEL via a twisted-pair, multiconductor shielded cable. These commands are transmitted over differential pairs, where they are optically isolated, filtered, AC-coupled, and then directed to the Gate Pulse Amplifier (GPA). Each SCR has a dedicated GPA, ensuring independent operation. The EHPA also provides galvanic isolation between the gates of the individual SCRs.

Sensor Inputs
The EHPA monitors conduction currents across all three phases of the bridge input. It acts as an interface between the Hall Effect sensors on the EXCS boards and the system controller. The EHPA supplies power to the EXCS and receives feedback signals from the EXCS, indicating the current flow status through each phase of the three-phase bridge input. These signals are received at connectors J9 and J10, where they are processed by the EHPA before transmitting the bridge status to the controller.

Bridge temperature is monitored via either an RTD (thermistor) sensor input or temperature switch input. For new exciters, only the RTD input is utilized, with jumpers on the EHPA disabling the temperature switch inputs. When retrofitting a bridge with an EX2100 control, the two temperature switch inputs are used to connect with the existing temperature switches on the bridge, and the RTD input is left disconnected to deactivate it. Both the RTD and temperature switch inputs are connected to the EHPA through J13.

Airflow sensors (fan rotation) detect loss of fan cooling in the bridge. One fan can be connected to the EHPA through J12. The EHPA accepts either a pulsed or dry-contact, normally open sensor input from the fan. The mode of signal detection is configured through the Berg jumper JP2.

Frequently Asked Questions:

1.How Does the EHPA Board Monitor Current Conduction?
The EHPA interfaces with Hall Effect sensors on the EXCS boards to monitor the conduction currents across all three phases of the bridge input. It receives feedback from these sensors indicating the current flow status through each phase and processes this information before sending it to the system controller.

2.What Temperature Monitoring Methods Does the EHPA Board Support？
The EHPA supports temperature monitoring via either an RTD (thermistor) sensor input or a temperature switch input. For new exciters, only the RTD input is used. When retrofitting an EX2100 control system to an existing bridge with temperature switches, the two temperature switch inputs are utilized, and the RTD input is left disconnected.

3.What are IS200EHPAG1DAB related products?

IS200EHPAG1D/ IS200EHPAG1DCB/ IS200EHPAG1DAB

Datasheet Link:

IS200EHPAG1DAB GE EX2100, Exciter Gate Pulse Amplifier Board PDF Datasheet