GE IS200DAMDG1A Gate Drive Interface Board

The IS200DAMDG1A is a Gate Drive Interface Board designed by General Electric (GE) for its Innovation Series Low Voltage Drives. This board is the version within the DAM series intended for the 180 frame drive, belonging to the DAMD sub-series. Its primary function is to provide the gate drive interface for one phase leg of the drive's power bridge, enabling precise control of the IGBTs. Unlike the DAMA, DAMB, and DAMC boards, the IS200DAMDG1A does not provide current amplification and functions solely as an interface board, therefore it requires no external power input.

The IS200DAMDG1A board is located between the control rack and the power switching devices (IGBTs), serving as a critical signal interface. It receives gate drive signals from the IS200BPIA Bridge Personality Interface board in the control rack and transmits them directly to the dual IGBT module of a single phase leg. The board features four LED indicators that show the on/off status of the two IGBTs, providing monitoring for field operation and maintenance personnel.

Key features of the IS200DAMDG1A include:

• Dedicated for 180 Frame: Suitable for the 180 frame of Innovation Series Low Voltage Drives.

• Single Phase Leg Drive: Each board drives the dual IGBT module (integrating upper and lower switches) of one phase leg.

• Interface Board Function: Provides no current amplification, functions only as a signal interface, requires no external power.

• Status Indication: Four LED indicators show the on/off status of the two IGBTs.

• Direct IGBT Connection: Connects directly to the IGBT gate, emitter, and collector terminals via the PL connector.

• Interface with BPIA: Connects to the BPIA board via cable, receiving control signals.

• Jumperless Design: The board has no fuses, test points, or configurable components, simplifying field maintenance.

• Matched with IGBT Module: Designed to work with the CM300DY-28H dual IGBT module.

The board mounts directly onto the IGBT modules, secured via the IGBT studs. This ensures the gate drive loop is as short as possible, minimizing parasitic inductance and interference. A 180 frame drive requires three IS200DAMDG1A boards, one for each phase (U, V, W), with each phase using one dual IGBT module.

II. Main Functions

The primary functions of the IS200DAMDG1A include, but are not limited to, the following:

1. Gate Drive Signal Interface

The IS200DAMDG1A board receives gate drive signals from the BPIA board and transmits them directly to the IGBT module via internal circuitry. As it provides no current amplification, the board itself requires no external power; all drive power comes from the BPIA board.

2. Phase Leg Driving

Each IS200DAMDG1A board is responsible for driving the dual IGBT module of a single phase leg. This module internally integrates two IGBTs, the upper and lower switches:

• IGBT1 (Upper): Connected between the positive DC bus and the phase output.

• IGBT2 (Lower): Connected between the phase output and the negative DC bus.

The drive circuits on the board independently drive the two IGBTs, ensuring they are never switched on simultaneously, preventing a shoot-through fault.

3. Status Indication

Four LED indicators on the board provide real-time monitoring of the two IGBTs' drive status:

• DS11ON (Yellow): Lights when IGBT1 (upper) is driven ON.

• DS31FF (Green): Lights when IGBT1 (upper) is driven OFF.

• DS22ON (Yellow): Lights when IGBT2 (lower) is driven ON.

• DS42FF (Green): Lights when IGBT2 (lower) is driven OFF.

These indicators provide operational status of the IGBTs for field personnel, facilitating quick diagnosis of drive circuit and IGBT functionality.

4. Direct Connection to IGBTs

The board connects directly to the IGBT module's gate, emitter, and collector terminals via the PL connector. This direct connection minimizes the length and parasitic inductance of the gate drive loop, improving switching performance and reducing switching losses and electromagnetic interference.

5. Interface with BPIA

The board connects to the BPIA board via a cable, receiving gate drive signals from the control rack. As the DAMD board lacks amplification, signals are transmitted directly from the BPIA to the IGBT.

6. Passive Design

The IS200DAMDG1A board contains no fuses, test points, or configurable components. All functionality is fixed at the factory. This design simplifies field maintenance and reduces the risk of faults caused by incorrect configuration.

7. Matching with IGBT Module

The IS200DAMDG1A board is specifically designed to work with the CM300DY-28H dual IGBT module. This IGBT module is a dual-switch package, internally integrating both the upper and lower IGBTs for one phase leg. Therefore, a 180 frame drive uses three IS200DAMDG1A boards and three dual IGBT modules.

III. System Applications

1. Application in Innovation Series Low Voltage Drives

The IS200DAMDG1A is a critical interface board connecting the control and power circuits within Innovation Series Low Voltage Drives. Its roles within the system include:

• Signal Interface: Transmits gate drive signals generated by the BPIA board directly to the IGBT module.

• Status Feedback: Provides indication of IGBT drive status via LED indicators.

2. Differences from Other DAM Versions

The DAM series has multiple versions for different drive frame power ratings:

The IS200DAMDG1A is specifically designed for the lower-power 180 frame drive, using a dual IGBT module requiring only one module per phase. Unlike the DAMA/DAMB/DAMC, the DAMD series does not provide current amplification and therefore requires no external power.

3. Typical Application Scenarios

• Small to Medium Power Industrial AC Variable Frequency Drives: Controls the speed and torque of small to medium power AC motors.

• Pump and Fan Control: Drives various pumps and fans in industrial process control applications.

• Compressor Control: Drives small to medium power industrial compressors.

• Conveyor Systems: Used for motor control in material handling systems.

• HVAC Systems: Drives fans and compressors in heating, ventilation, and air conditioning systems.

  
  

IV. Detailed Interface Description

1. PL Connector (IGBT Connection)

PL is a 12-pin connector for directly connecting to the IGBT module's gate, emitter, and collector terminals. Pin assignments are as follows (1 = Upper, 2 = Lower):

2. LED Indicators

V. Installation and Replacement

1. Mounting Location

The IS200DAMDG1A board mounts directly onto the IGBT modules, located below the heatpipe heat exchanger assembly. One IS200DAMDG1A board is installed on the dual IGBT module for each phase leg.

2. Removal Procedure

Safety Warnings:

• WARNING: To prevent electric shock, turn off power to the drive system and use high-voltage test equipment to verify circuits are de-energized before touching.

• CAUTION: To prevent component damage caused by static electricity, treat all boards with static sensitive handling techniques. Wear a grounding strap and store boards in anti-static bags.

Removal Steps:

1. Verify Power Off: Ensure the drive system is completely de-energized.

2. Open Cabinet Door: Open the drive cabinet door. Use high-voltage test equipment to verify circuits are de-energized.

3. Locate Board: Find the IGBT modules and IS200DAMDG1A board below the heatpipe heat exchanger assembly.

4. Remove Shunt Board Assembly:

• Remove the three bolts, washers, and spring lock washers securing the shunt board assembly to the IGBT module.

• Allow the shunt board assembly to hang by the connected motor cables.

• Note: Do not allow the shunt board assembly to hang only from the control wires. If the motor cables are not connected, support the assembly by an auxiliary method.

5. Remove Outer Flex Circuit: Remove the three bolts, washers, and spring lock washers securing the outer flex circuit and motor output bus bar.

6. Relocate Flex Circuit: Move the flex circuit and bus bar so they will not interfere with the IS200DAMDG1A board and IGBT module removal.

7. Remove Inner Flex Circuit: Repeat steps 5-6 for the inner flex circuit and motor output bus bar.

8. Remove IGBT Module:

• Remove the four Allen-head bolts and washers securing the IGBT module to the heatsink.

• Remove the IGBT module.

9. Remove Board: Remove the two screws securing the standoff (for the shunt board assembly) to the IS200DAMDG1A board and remove the standoff.

3. Installation Procedure

1. Install Standoff: Using two screws, secure the standoff for the shunt board assembly to the new IS200DAMDG1A board and IGBT module. Tighten these screws.

2. Install IGBT Module:

• Spread an even film of Dow Corning 340 silicon grease (or equivalent) onto the back mounting surface of the IGBT module (must be at least 6 mils thick).

• Orient and position the new IGBT module with IS200DAMDG1A board in the same position as the one removed, and insert the four Allen-head bolts and washers into the mounting holes.

• Snug up the four bolts (in a diagonally crossing pattern: top left, lower right, top right, lower left).

• Tighten the four bolts (in a diagonally crossing pattern, reversed from the previous step) to 45 inch-pounds torque.

3. Install Inner Flex Circuit: Reposition the inner flex circuit and motor output bus bar over the mounting holes. Secure with three bolts, washers, and spring lock washers.

4. Install Outer Flex Circuit: Repeat step 3 for the outer flex circuit.

5. Install Shunt Board Assembly: Reinstall the shunt board assembly to the IGBT module with three bolts, washers, and spring lock washers.

6. Connect PL Cable: Reconnect the cable to the PL connector on the new IS200DAMDG1A board.

7. Inspect Installation: Visually inspect all connections, buses, and bolted hardware for correct installation.

8. Clean Up Check: Visually check the drive cabinet for any tools, debris, or other hardware that may be left inside.

9. Close Door: Close the drive cabinet door after confirming everything is correct.