The DS200SHVMG1A is an SCR High Voltage M-Frame Interface Board designed by General Electric (GE) Industrial Control Systems for its M-frame drives. Belonging to the SHVM (SCR High Voltage M-Frame Interface Board) series, this board is part of the G1 group and serves as a critical interface component connecting the SCR power bridge of M-frame drives to the drive control system’s power supply boards.
The primary function of the SHVM high voltage interface board is to provide an interface for signals from an M-frame drive’s SCR bridge to the DCFB or SDCI Power Supply Board and the PCCA Power Connect Card. This board integrates multiple functions, including shunt signal isolation and conversion, AC current transformer attenuation, AC line voltage attenuation, and DC bridge voltage attenuation, ensuring that high-voltage side signals are safely and accurately transmitted to the control side. It is a core component for achieving precise control and reliable protection in M-frame drive systems.
The DS200SHVMG1A board is designed to meet the demands of high-voltage industrial drive applications and features the following characteristics:
Shunt Signal Isolation and Conversion: Converts ±500 mV shunt signals into 0 to 500 kHz differential frequency outputs, with isolator input circuits floating to bridge potential.
Selectable 10:1 Current Transformer Attenuation: Provides additional current attenuation capability via hardware jumpers when main line ACCT secondary current exceeds 144 mA.
AC Line Voltage Attenuation: Configurable attenuation based on main AC line voltage level (240-600 V or 601-1000 V).
DC Bridge Voltage Attenuation: Configurable attenuation for DC bus voltage feedback via hardware jumpers based on main AC line voltage.
Passive Design: No LEDs, fuses, testpoints, or switches; only configurable jumpers and connectors.
High Voltage Isolation: Board hardware floats at feedback voltage potential, ensuring safe isolation between high-voltage side and control side.
This product is widely used in M-frame high-voltage DC drive systems and high-power industrial drive control applications, particularly in industrial environments requiring high voltage and high current signal handling.
II. Key Functions
1. DC Bridge Shunt Isolator Circuits
The DS200SHVMG1A board includes DC positive (+) and DC negative (-) floating shunt isolator voltage-controlled oscillator (VCO) circuits that convert shunt signals from the SCR bridge into frequency signals that can be processed by the control side. These circuits feature:
Input Range: -500 mV to +500 mV
Output Frequency: 0 to 500 kHz (differential frequency output)
Signal Isolation: Isolator input circuits float to bridge potential, achieving electrical isolation between the high-voltage side and the control side
Output Connection: Converted frequency signals are sent to the DCFB or SDCI Power Supply Board via IA1PL and IA2PL connectors
2. AC Current Transformer (ACCT) Attenuation
The DS200SHVMG1A board provides 10:1 current transformer (CT) attenuation for AC line currents (phase A and phase C) when required. This attenuation is jumper-selectable:
Attenuation Requirement: Attenuation is required when the main line ACCT secondary current exceeds 144 mA, as the CT burden resistors on the DCFB and SDCI Power Supply Boards are not rated to handle more than 144 mA.
Attenuation Selection: Jumper selection (JP1-JP8) determines whether 10:1 attenuation is enabled.
Bypass Condition: Attenuation should be bypassed when the main line ACCT secondary current is less than 144 mA.
Important Note: If 10:1 CT attenuation is used, compensation must be applied when setting the burden scaling switches on the SDCI or DCFB Power Supply Board.
3. AC Line Voltage Attenuators (L1, L2, L3)
The DS200SHVMG1A board provides AC line voltage attenuators to attenuate AC line voltage when required, based on the AC line voltage magnitude and generator field rating:
Bypass Condition: When the main AC line voltage is 240-600 V, attenuators should be bypassed.
Enable Condition: When the main AC line voltage is 601-1000 V, attenuators should be enabled.
Configuration Method: Jumper selection (JP9-JP17) determines whether attenuation is enabled or bypassed.
4. DC Bridge Voltage Attenuators (P1 and P2)
The DS200SHVMG1A board provides DC positive and DC negative voltage resistor string attenuators to attenuate DC voltage when required, based on field voltage ratings:
Function: Configurable jumpers scale the DC bus voltage feedback.
Setting Basis: Jumper settings are based on the nominal main AC input voltage.
Bypass Condition: When the main AC line voltage is 240-600 V, voltage resistor string attenuators should be bypassed.
Enable Condition: When the main AC line voltage is 601-1000 V, voltage resistor string attenuators should be enabled.
5. Signal Conversion and Transmission
The DS200SHVMG1A board converts, isolates, and attenuates various signals from the SCR bridge and transmits them to the control-side power supply boards and power connect card via multiple connectors:
Shunt Signals: Sent to the DCFB/SDCI board via IA1PL and IA2PL connectors
AC Current Signals: Sent to the DCFB/SDCI board via the 1CPL connector
Power Synchronization Signals: Receives 25 kHz power from the power supply board via the SQPL connector
III. Hardware Architecture
1. Board Structure
The DS200SHVMG1A board uses a standard printed circuit board structure and is mounted on the drive’s SCR assembly, secured with six nylon standoffs and nylon nuts. The board includes:
17 Configurable Jumpers (JP1-JP17): For attenuation selection
8 Plug Connectors: For interfacing with power supply boards and other cards
18 Stab Connectors: For connecting high-voltage signals from the SCR bridge
Passive Design: No LEDs, fuses, testpoints, or switches
2. Mounting Location
The DS200SHVMG1A board is mounted on the drive’s SCR assembly, secured with six nylon standoffs and nylon nuts. As a high-voltage interface board, the board hardware floats at feedback voltage potential, and high-voltage input may be present even when control power is de-energized.
3. Connector Description
The DS200SHVMG1A board includes various connectors for interfacing with the SCR bridge, power supply boards, and other devices:
| Connector | Type | Function Description |
| CT1PL | 2-pin plug | L1 phase AC current transformer input (white = negative, red = positive) |
| CT3PL | 2-pin plug | L3 phase AC current transformer input (white = negative, red = positive) |
| DC1PL | 2-pin plug | Shunt 1 input (red = positive, white = negative) |
| DC2PL | 2-pin plug | Shunt 2 input (red = positive, white = negative) |
| 1CPL | 4-pin plug | AC current signal I/O with power supply board |
| SQPL | 4-pin plug | 25 kHz power synchronization signals with power supply board |
| IA1PL | 2-pin plug | Armature shunt 1 output to power supply board |
| IA2PL | 2-pin plug | Armature shunt 2 output to power supply board |
| Stab Connectors | 18 | AC line voltage and DC bridge voltage signals from SCR bridge |
4. Configurable Jumpers
The DS200SHVMG1A board includes 17 configurable jumpers (JP1-JP17) for attenuation selection:
| Jumper Range | Function | Description |
| JP1-JP8 | 10:1 CT attenuation selection | Enable attenuation when main line ACCT secondary current exceeds 144 mA; bypass when less than 144 mA |
| JP9-JP17 | AC line voltage/DC bridge voltage attenuation selection | Enable attenuation when main AC line voltage is 601-1000 V; bypass when 240-600 V |
IV. Detailed Interface Description
1. CT1PL Connector
The CT1PL connector is used for L1 phase AC current transformer (ACCT) input:
| Pin | Signal | Description |
| CT1PL-1 | L1 ACCT current negative input | White wire |
| CT1PL-2 | L1 ACCT current positive input | Red wire |
2. CT3PL Connector
The CT3PL connector is used for L3 phase AC current transformer (ACCT) input:
| Pin | Signal | Description |
| CT3PL-1 | L3 ACCT current negative input | White wire |
| CT3PL-2 | L3 ACCT current positive input | Red wire |
3. DC1PL Connector
The DC1PL connector is used for shunt 1 input:
| Pin | Signal | Description |
| DC1PL-1 | Shunt 1 positive connection | Red wire |
| DC1PL-2 | Shunt 1 negative connection | White wire |
4. DC2PL Connector
The DC2PL connector is used for shunt 2 input:
| Pin | Signal | Description |
| DC2PL-1 | Shunt 2 positive connection | Red wire |
| DC2PL-2 | Shunt 2 negative connection | White wire |
5. 1CPL Connector
The 1CPL connector provides AC current signal I/O with the power supply board (DCFB or SDCI):
| Pin | Signal | Description |
| 1CPL-1 | L1 ACCT current output | White wire |
| 1CPL-2 | L1 ACCT current output | Red wire |
| 1CPL-3 | L3 ACCT current output | Red wire |
| 1CPL-4 | L3 ACCT current output | White wire |
6. SQPL Connector
The SQPL connector provides 25 kHz power synchronization signals with the power supply board:
| Pin | Signal | Description |
| SQPL-1 | ACNP | 25 kHz positive power (+) from power supply board |
| SQPL-2 | ACNN | 25 kHz negative power (-) from power supply board |
| SQPL-3 | ACNACOM | 25 kHz power common |
| SQPL-4 | ACNACOM | 25 kHz power common |
7. IA1PL Connector
The IA1PL connector outputs armature shunt 1 signals to the power supply board:
| Pin | Signal | Description |
| IA1PL-1 | Shunt 1 positive output | Red wire |
| IA1PL-2 | Shunt 1 negative output | White wire |
8. IA2PL Connector
The IA2PL connector outputs armature shunt 2 signals to the power supply board:
| Pin | Signal | Description |
| IA2PL-1 | Shunt 2 positive output | Red wire |
| IA2PL-2 | Shunt 2 negative output | White wire |
9. Stab Connectors
The SHVM board includes 18 stab connectors for connecting AC line voltage and DC bridge voltage signals from the SCR bridge. These signals include:
AC Line Voltages: L1, L2, L3 phase voltages
DC Bridge Voltages: P1 (positive), P2 (negative)
V. Configuration and Settings
1. Hardware Jumper Configuration
The 17 configurable jumpers (JP1-JP17) on the SHVM board are used for attenuation selection:
| Jumper | Function | Setting Description |
| JP1-JP8 | 10:1 CT attenuation selection | IN position (attenuation enabled) when main line ACCT secondary current exceeds 144 mA; OUT position (attenuation bypassed) when less than 144 mA |
| JP9-JP17 | AC line voltage/DC bridge voltage attenuation selection | IN position (attenuation enabled) when main AC line voltage is 601-1000 V; OUT position (attenuation bypassed) when 240-600 V |
Important Notes:
If 10:1 CT attenuation is used, compensation must be applied when setting the burden scaling switches on the SDCI or DCFB Power Supply Board.
Jumper settings must match the actual voltage levels of the field application.
When replacing an SHVM board, all jumpers on the new board must be set to the same positions as on the board being replaced.
2. Attenuator Selection Guidelines
| Voltage Level | AC Line Voltage Attenuation | DC Bridge Voltage Attenuation | 10:1 CT Attenuation |
| 240-600 V | Bypass (OUT) | Bypass (OUT) | Based on ACCT secondary current |
| 601-1000 V | Enable (IN) | Enable (IN) | Based on ACCT secondary current |
3. ACCT Secondary Current Calculation
The ACCT secondary current (in mA) is approximately calculated as:
Ict (mA) = (1 pu rated current × 1000) / Combined CT turns ratio
When Ict ≥ 144 mA, 10:1 CT attenuation is required; when Ict < 144 mA, attenuation should be bypassed.
VI. Installation and Maintenance
1. Mounting Location
The DS200SHVMG1A board is mounted on the drive’s SCR assembly, secured with six nylon standoffs and nylon nuts. As a high-voltage interface board, the board hardware floats at feedback voltage potential.
2. Safety Warnings
Important Safety Warnings:
The SHVM board is a high-voltage interface board. High-voltage input may be present even when control power is de-energized.
Verify that all high-voltage input is de-energized before making any hardware adjustments or changing the board.
Only adequately trained personnel who are thoroughly familiar with the equipment and instructions should install or maintain this equipment.
3. Replacement Procedure
Power Off: Turn off power to the drive, wait several minutes for power supply capacitors to discharge, and test to verify that no power exists.
Verify High Voltage De-energized: Confirm that all high-voltage input is de-energized.
Open Cabinet Door: Access the printed wiring board area.
Locate SHVM Board: Find the SHVM board mounted on the SCR assembly (secured with six nylon standoffs and nylon nuts).
Disconnect Cables: Carefully disconnect all cables. For ribbon cables, grasp the sides of the cable connector and gently pull; for cables with pull tabs, carefully pull the tab.
Remove Nylon Nuts: Remove the six nylon nuts securing the SHVM board and remove the old board.
Configure New Board: Set all jumpers (JP1-JP17) on the new board to the same positions as on the board being replaced.
Install New Board: Position the new SHVM board on the nylon standoffs and secure it with the six nylon nuts removed in step 6.
Reconnect Cables: Reconnect all cables as labeled, ensuring they are properly seated at both ends.
Close Cabinet Door.
4. Maintenance Recommendations
High-Voltage Safety: Always be aware of high-voltage hazards during maintenance, even when control power is de-energized.
ESD Precautions: Always wear a grounding strap when handling boards. Store boards in anti-static bags.
Jumper Verification: After replacing the board, verify that all jumper settings are correct.
Periodic Inspection: Check connectors for looseness and nylon nuts for secure fastening.
Spare Parts Management: It is recommended to keep at least one identical SHVM board on-site as a spare to minimize downtime.
VII. Applications
The DS200SHVMG1A SCR High Voltage M-Frame Interface Board is widely used in the following industrial applications:
M-Frame DC Drive Systems: Provides high-voltage signal interface for M-frame SCR bridges.
High-Power DC Drives: Suitable for DC drive applications requiring high voltage and high current signal handling.
Multi-Bridge Drive Systems: Provides signal isolation and attenuation in multi-bridge drive applications.
Industrial Process Control: Provides signal interface in industrial processes requiring high-voltage DC drives.
System Upgrades and Retrofit Projects: Replaces high-voltage interface boards in older drive systems, enhancing system reliability.
