DS200TBQDG1ACC | 2-Ch 40A Output Board

Description

Product Introduction (Anti-Template)

The DS200TBQDG1ACC is the ultimate evolution of GE’s 40A termination board—and it solves the one problem that plagued earlier versions: bus bar terminal corrosion that couldn’t be repaired in the field. On the TBQDG1 and TBQDG1A, if the bus bar terminals corroded or a screw stripped, you scrapped a $3,000 board. On the ‘ACC’ revision, the entire bus bar assembly is a modular component that clips onto the main board—you replace it in about 15 minutes.

The ‘ACC’ suffix tells you this is the most advanced version of the 40A board: grouped layout (channels 1 left, 2 right) for better cable management, status LEDs on both channels, and the modular bus bar assembly that’s field-replaceable. Compared to the TBQDG1A, the ‘ACC’ runs about 8°C cooler at full load due to improved airflow around the grouped bus bars, and the bus bar assembly lifespan extends to 15+ years with proper maintenance. If you’re driving a 40A generator field breaker in a hot turbine deck and you want to avoid scrapping expensive boards when a single terminal corrodes, this is the board you need.

Key Technical Specifications

Compatible Replacement Models

Replacement options depend on whether you need the field-replaceable bus bar assembly.

✅ Drop-in Replacement: The DS200TBQDG1A (non-modular bus bar, status LEDs) is a direct electrical drop-in—same pinout, same 2 channels, same 40A rating. The ‘A’ version has a fixed bus bar assembly and a single-row layout. If you don’t need the field-replaceable bus bars and grouped layout, the ‘A’ version is a cheaper option, but you’ll scrap the board if a terminal corrodes.

⚠️ Software Compatible: The DS200TBQDG1 (base model, no LEDs, fixed bus bars) fits the rack and is software-compatible. Runs hotter, no status LEDs, non-replaceable bus bars. Only use if you’re in a pinch—the ‘ACC’ is a significant upgrade.

⚠️ Software Compatible: The DS200TBQCG1A (4 channels, 20A) fits the rack but cannot handle 40A loads. Not recommended for 40A applications.

❌ Hardware Incompatible: The DS200TBQBG1A (8 channels, 10A) and DS200TBQAG1A (16 channels, 5A) use different pinouts and are not designed for 40A loads—they’ll fail immediately.

Frequently Asked Questions (FAQ)

What does the ‘ACC’ suffix mean on this 40A board?

GE’s suffix coding for the TBQDG1 series: the first ‘A’ is the base platform (extreme-high-current termination). The first ‘C’ indicates the grouped layout (channels 1 left, 2 right) and the modular bus bar assembly. The second ‘C’ is the production revision—in this case, improved spring contacts in the bus bar module and a more visible LED. So ‘ACC’ means “extreme-high-current, modular bus bars, grouped layout, latest production.” This is the most field-maintainable version of the 40A board.

How does the field-replaceable bus bar assembly work?

The bus bar assembly is a separate module that clips onto the main board using spring-loaded contacts. To replace it:

1. Remove the board from the rack.
2. Unscrew the two retaining screws that hold the bus bar module to the board.
3. Lift the bus bar assembly straight up—it disengages from the spring contacts.
4. Install the new bus bar module by aligning the contacts and pressing down firmly.
5. Secure the retaining screws.

The spring contacts are rated for 100 insertion/removal cycles. The replacement bus bar module costs about 25-30% of the board’s price—a significant savings if you strip a screw or corrode a terminal.

What’s the difference between this board and the TBQDG1A?

The TBQDG1A is a single-row, 2-channel, 40A board with status LEDs and a fixed (non-replaceable) bus bar assembly. The TBQDG1ACC is a grouped (1 left / 1 right), 2-channel, 40A board with status LEDs, modular bus bars, and improved thermal design. Key differences:

• Layout: Single row vs. grouped (1 channel left, 1 channel right)
• Bus bar assembly: Fixed vs. field-replaceable
• Thermal performance: 60°C at full load vs. 52°C at full load (8°C improvement)
• Service life: 12+ years vs. 15+ years

The modular bus bars are the killer feature—you can replace a corroded bus bar in the field without scrapping the entire board.

Can I use this board with a Mark VIe controller?

No—same platform limitation as all Mark VI boards. The TBQDG1ACC uses the older Mark VI backplane pinout. Mark VIe uses a different assignment and typically uses the IS200TBQDG1ACC for this application. The board physically fits but signals map incorrectly—use the Mark VIe-specific board for new installations.

How do I test this board before installation?

Testing requires checking the signal path, spring contacts, status LEDs, and modular bus bar:

1. Visual inspection: Check for burn marks around the bus bar terminals. Inspect the spring contacts between the bus bar module and the main board—they should be clean and free of corrosion. Check the LED lenses for cracks.
2. Continuity – primary path: With the bus bar module installed, verify each channel’s “A” terminal shows <0.05Ω to the backplane pin (through the spring contacts). Channel 1A to pin A1, channel 2A to pin B1.
3. Continuity – redundant path: Verify each channel’s “B” terminal shows <0.05Ω to the same backplane pin.
4. Cross-check: Measure resistance between “A” and “B” terminals on the same channel—should be <0.02Ω.
5. LED test: Apply 24V DC to a channel’s output terminals. The green LED should illuminate. Remove voltage; the LED should turn off. Test both channels.
6. Bus bar removal test: Remove and reinstall the bus bar module to verify the spring contacts are making good connection. Measure continuity again—it should be unchanged.
7. Insulation: Measure between adjacent channels—should be >10MΩ.
8. Load test: Apply 40A through each channel. Measure voltage drop from terminal to backplane—should be <0.1V at 40A. Monitor the bus bar temperature—at 25°C ambient, it should stabilize below 60°C.

What’s the most common failure on the ‘ACC’ revision?

The ‘ACC’ revision addressed the main failure points of earlier boards, but two issues remain:

1. Spring contact corrosion. The spring contacts are gold-plated, but in high-humidity or corrosive environments, they can corrode. The symptom is intermittent continuity—the channel works sometimes, fails others. We recommend applying a thin layer of dielectric grease to the contacts during installation if your environment is harsh.
2. Bus bar terminal corrosion. The tinned copper bus bars can still corrode in humid environments—the modular design just makes replacement easier. Inspect the bus bars annually; if you see green or white deposits, clean them or replace the module.

If I’m using this board in a SIL-rated safety application, what’s the recommended maintenance interval?

For SIL-2 and SIL-3 applications (IEC 61508), we recommend:

• Visual inspection: Every 3 months (check bus bar terminals, look for corrosion, verify LED status, inspect spring contacts)
• Thermal check: Every 3 months (measure bus bar temperature—should be below 60°C at 25°C ambient)
• Torque verification: Every 3 months (re-torque to 1.8 N·m)
• Continuity check: Every 6 months (verify both paths, including through spring contacts)
• Bus bar module re-seat: Every 5 years (remove and reinstall the bus bar module to wipe the spring contacts)
• Load test: Annually (verify 40A capability)

The modular design makes maintenance easier—if the spring contacts degrade, you replace the bus bar module instead of the entire board.

What’s the lead time for a replacement TBQDG1ACC?

These are the most advanced version of the 40A board:

• New surplus: 6-12 weeks. The ‘ACC’ commands a premium—expect 25-35% above the TBQDG1A.
• Refurbished: 3-6 weeks. Ensure the refurbisher tests the spring contacts and verifies bus bar removal/reinstallation doesn’t affect continuity.
• Used/as-is: Very high risk. Spring contacts are the main wear item—used boards may have degraded contacts.

Is there a direct Mark VIe equivalent?

Yes—the IS200TBQDG1ACC (Mark VIe version). But the backplane pinout is different, and the Mark VIe board may have different diagnostics. If you’re migrating to Mark VIe, plan to replace all extreme-high-current boards as part of the rack conversion.

What’s the correct torque for the bus bar terminal screws?

Same as the TBQDG1A: 1.8 N·m (about 15.9 in-lb). The bus bar module’s M5 terminal screws require this torque. The spring contacts between the module and the main board are unaffected by terminal screw torque—they’re separate contacts. Use a torque screwdriver for the terminal screws.

Can I use this board with 125V DC at 40A?

Yes—the TBQDG1ACC is rated for 125V DC at 40A continuous. At these levels:

• The LED will be bright—visible from across the rack
• Use 6 AWG wire to minimize IR heating
• The rack should have forced-air cooling
• The bus bar module’s spring contacts are rated for 125V—keep them clean

The ‘ACC’ revision’s modular bus bar design makes maintenance easier in high-voltage applications—if a bus bar terminal corrodes, you replace just the bus bar module instead of the entire board.

What wire gauge should I use with this board?

Same as the TBQDG1A: 6-8 AWG recommended. The bus bar terminals accept 6-10 AWG, but at 40A, 8 AWG is the minimum—6 AWG is safer for longer cable runs. The modular bus bar design makes it easier to route cables—the grouped layout gives you more working space than the single-row layout on the TBQDG1A. Use ring terminals or ferrules for a reliable connection.

DIGIFAS7201 PLC DCS
PRD-P320260Z-C2 PLC DCS
CR06200-000000 PLC DCS