IS200GDDDG1A - Gate Driver and Dynamic Discharge Board

SPECIFICATIONS

Part Number: IS200GDDDG1A
Manufacturer: General Electric
Series: EX2000
Product Type: Driver Board
Availability: In Stock
Country of Manufacture: United States (USA)
Manual: GEH - 6375A

Functional Description

IS200GDDDG1A is a Gate Driver and Dynamic Discharge Board manufactured and designed by GE. The interface isolation between the IGBTs and the main processor firing circuits is provided by the Gate Driver and Dynamic Discharge board (GDDD). The GDDD board, as well as the gating circuits for the A and B leg active IGBTs, use dynamic discharge circuit control. This board also provides the regulator's instrumentation. The GDDD board processes the output dc voltage, dc link voltage, shunt current mV input, and heat sink thermistor input before sending them to the LDCC processors for use by the regulators.

Jumpers

JP1 - JP3 jumpers on the GDDD board configure the following items:

• JP1 Jumper:
  
  • Function: JP1 jumper configures the DC output voltage input level to the GDDD board inputs APL-6 and BPL-5.
  • Requirement: It must match the value specified in EE.612 (VDCMAX).
• JP2 Jumper:
  
  • Function: JP2 jumper configures the DC link voltage input level to the GDDD board inputs CPL-12 and CPL-2.
  • Requirement: The configured value must be consistent with the value specified in EE.612 (VDCMAX).
• JP3 Jumper:
  
  • Function: JP3 jumper configures the DC dynamic discharge reference to the GDDD board's inputs CPL-12 and CPLCOM.
  • Requirement: It should correspond to the level specified in EE.612(VDCMAX). Specifically, when EE.612 = 604, JP.3 = 500, and when EE.612 = 360, JP.3 = 300.

LEDs

• Bridge OK LED (DS100):
  
  • Function: Indicates the absence of IGBT leg faults or overcurrents.
  • Indicator: Illuminates when no faults or overcurrents are detected.
• IMOK LED (DS101):
  
  • Function: Provides comprehensive status information about the board.
  • Indicator:Illuminated when no bridge faults are detected. Indicates that the unit is not reset. Shows correct power supply voltages. Illuminates when no dynamic discharge faults are detected.
• DD AUX POWER AVAILABLE LED (DS102):
  
  • Function: Indicates the availability of auxiliary power for the dynamic discharge circuit.
  • Indicator: Illuminates when auxiliary power for the dynamic discharge circuit is available from the DC link source via the RDS connection.

Test Points

• Analog TP1 0-5 V proportional to PWM output voltage of a bridge
• TP2 Analog 0-5 V proportional to the output current of the PWM bridge
• TP3 Analog 0-5 V proportional to the dc link voltage of the PWM.
• TP4 DCOM GDDD board signal common reference
• Dynamic Discharge command value TP5
• Dynamic Discharge feedback value TP6
• TP7 When combined with TP8, this test point provides the PWM bridge's dc output voltage.
• TP8 When combined with TP7, this test point provides the PWM bridge's dc output voltage.

Procedure for board replacement

1. Remove all input power.
2. To reveal the PSCD board, open the upper board rack door. Behind this board is the GDDD board.
3. Remove the latch and lower the board rack.
4. Disconnect all cables from the GDDD board with care, as shown below:
   1. Carefully pull the tab on ribbon connectors with pull tabs.
   2. One edge of the connector is secured to the board plug for plug connectors. Remove the securing clip and gently pull on the connector's sides until it comes free.
   3. To remove the connector from a stab connector, use needle-nose pliers.
5. Remove the GDDD board from the rack by releasing the securing clips that hold it in place.
6. Set the jumpers on the new board to match the jumpers on the old board.
7. Install the new board and reconnect all cables, making sure that each connector is seated properly on both ends.

Features

• dynamic discharge circuitry on the board regulates the C leg of the 3-phase IGBT pack. In the case that control power is lost, a backup power source is supplied to the GDDD board using the RDS resistor for the discharge circuit.
• The control level of the dc link by the dynamic discharge circuit is set by jumper settings on the board.
• The dc link capacitors are connected to the IGBT bridge via the IAXS board, along with dynamic discharge control and gate control. The IAXS board serves as a connection point for the control circuitry's sensing feedback and dc output voltage.

WOC has the largest stock of GE EX2000 Excitation Control System Replacement Parts. WOC is happy to assist you with any of your automation requirements. For pricing and availability on any parts and repairs, kindly get in touch with our team by phone or email.

FREQUENTLY ASKED QUESTIONS

 

What is IS200GDDDG1A?
It is a Gate Driver and Dynamic Discharge Board developed by General Electric as part of the EX2000 Series used in Excitation Control Systems.

What are test points, and why are they important?
Test points are specific locations within a system where technicians can access signals or measurements for diagnostic and monitoring purposes. They are crucial for troubleshooting, performance analysis, and maintenance tasks, providing valuable insights into the system operation.

How many test points are available within the assembly, and what do they monitor?
There are eight test points available within the assembly, each serving a unique monitoring function. These test points include analog signals proportional to PWM output voltage and current, DC link voltage, as well as specific signals related to dynamic discharge operations and PWM bridge DC output voltage.

How can technicians use analog TP1 and TP2 to assess the performance of the PWM bridge?
Analog TP1 provides a voltage signal proportional to the PWM output voltage, while Analog TP2 offers a signal proportional to the output current of the PWM bridge. Technicians can use these test points to monitor and analyze the voltage and current levels, aiding in performance optimization and fault detection of the PWM bridge.

How do TP7 and TP8 provide access to the PWM bridge DC output voltage?
TP7 and TP8, when combined, offer access to the PWM bridge DC output voltage. Technicians can use these test points to monitor the voltage output accurately, enabling comprehensive analysis and troubleshooting of voltage-related issues within the system.

Why are monitoring dynamic discharge commands and feedback values important?
Monitoring dynamic discharge command and feedback values (TP5 and TP6) allows technicians to assess the effectiveness of dynamic discharge operations. By comparing these values, operators can ensure proper control over discharge processes, enhancing system performance and safety.