GE 336A4940CTP1 SYS000156 | Mark VIe CPCI Control Rack

Description

• Brand: GE / General Electric
• Full Model Number: 336A4940CTP1 / SYS000156
• System/Series Family: GE Mark VIe Control System
• Core Function: Four-slot CompactPCI rack for Mark VIe controllers, I/O packs, and associated CPCI hardware
• Rack Type: CPCI
• Slots: 4
• Power Configuration: 1 × CPCI power supply provision
• Cooling: Integrated fan
• Dimensions: Approx. 23.42 × 34.45 × 13.11 cm
• Environmental Operating Range: 0°C to +65°C
• Humidity: 5–95% non-condensing
• Airflow: Approx. 300 linear ft/min
• Protection: NEMA 1 / IP20
• Primary Application: Mark VIe turbine control
• Stock Status: New Surplus / Fully Tested — verify rack revision, power-supply configuration, and SYS000156 identification before shipment

GE Mark VIe documentation identifies 336A4940CTP1 as the CPCI rack with one power supply, while the corresponding CTP2 version provides two power supplies. The P1 rack includes a front-panel on/off switch and integrated fan cooling.

Module 3: Commercial-Technical Deep Dive

A Mark VIe controller can be fully functional while the CPCI chassis becomes the actual point of failure through a damaged backplane, failed fan, or defective power-distribution assembly. The GE 336A4940CTP1 provides the physical and electrical infrastructure for a four-slot CompactPCI Mark VIe control rack. GE documentation specifies the P1 configuration as a single-power-supply rack with an integral fan, while the rack distributes the generated ±12 VDC, 5 VDC, and 3.3 VDC rails through the backplane to controllers and fans.

The hard ROI is preserving the existing Mark VIe CPCI architecture without replacing healthy controller cards simply because the rack hardware has failed. The published enclosure is approximately 23.42 × 34.45 × 13.11 cm, with a 0°C to +65°C operating range, 5–95% non-condensing humidity, and approximately 300 linear ft/min airflow. One important distinction: CTP1 and CTP2 are not interchangeable rack configurations; CTP2 provides two power-supply positions and does not use the same front-panel power-switch arrangement as P1.

GE 336A4940CTP1 SYS000156

Module 4: Compatibility & Installation Traps

Migration/Compatibility

For an existing Mark VIe installation specified for 336A4940CTP1, the correct strategy is a like-for-like four-slot CPCI rack replacement. No firmware or PLC logic rewrite is associated with the rack itself.

The important compatibility checks are the number of CPCI slots, power-supply configuration, backplane arrangement, fan assembly, front-panel switching, mechanical mounting, and the specific Mark VIe controller cards installed in the rack.

⚠️ Field Traps (Watch Out)

• CTP1 versus CTP2: GE identifies 336A4940CTP1 as the one-power-supply rack, while 336A4940CTP2 provides two power supplies. Do not substitute the CTP2 assembly merely because the mechanical envelope appears similar.
• Backplane compatibility: The rack distributes ±12 VDC, 5 VDC, and 3.3 VDC to the CPCI modules. A damaged or contaminated backplane connector can produce multiple controller faults that initially look like independent module failures.
• Fan failure: The P1 rack incorporates an integrated fan. Verify fan rotation, airflow, and abnormal bearing noise before returning the rack to continuous service.
• Power-switch configuration: The P1 version has a front-panel on/off switch connected to the power-supply disable function. This differs from the P2 arrangement and must be checked during wiring and commissioning.
• SYS000156 identification: Treat SYS000156 as a secondary identification/reference and verify the physical GE catalog marking 336A4940CTP1 against the installed cabinet documentation before shipment.

Module 5: Quality Assurance SOP

1. OEM anti-counterfeit visual inspection — verify GE markings, 336A4940CTP1 identification, SYS000156 reference, CPCI slot arrangement, front-panel labeling, and evidence of unauthorized modification.
2. Part-number reconciliation — photograph the complete rack identification, serial information, labels, power-supply markings, and secondary references.
3. Mechanical inspection — inspect the chassis, CPCI backplane connectors, slot guides, mounting points, fan housing, front panel, and power-switch assembly for damage or deformation.
4. Power-supply verification — confirm the rack is configured for the single-power-supply P1 arrangement and that the mating supply is the correct GE component.
5. Power-on self-test (POST) — energize the rack in a controlled test environment and verify correct startup, fan operation, and power-distribution behavior.
6. Backplane voltage verification — measure the appropriate ±12 VDC, 5 VDC, and 3.3 VDC rails at approved test points or with representative CPCI loads.
7. CPCI slot verification — install representative Mark VIe-compatible CPCI modules and verify recognition, mechanical seating, and stable backplane operation.
8. Fan and airflow verification — confirm fan startup, airflow direction, and stable operation under representative rack load.
9. Power-switch test — verify the P1 front-panel switch correctly controls the power-supply disable path.
10. Thermal stability observation — operate the rack under representative controller load and monitor internal temperature, fan performance, power-rail stability, and intermittent resets.
11. Final QC release — retain rack photographs, power-rail measurements, fan-test results, installed test-card information, and packaging inspection records.

For a CPCI rack, powering the chassis with no cards installed is only a preliminary check. The meaningful QA result is stable backplane power and mechanical/electrical operation with representative Mark VIe modules installed.

Module 6: CRO-Driven Buyer FAQ

1. What is GE 336A4940CTP1?

It is a GE Mark VIe CPCI rack designed to house CompactPCI controller hardware. GE documentation identifies the P1 version as a four-slot rack with one power supply and an integrated fan.

2. Is 336A4940CTP1 the same as 336A4940CTP2?

No. CTP1 provides one power-supply position, while CTP2 provides two. The CTP1 also uses a front-panel on/off switch arrangement that differs from the P2 rack.

3. Is 336A4940CTP1 a controller or power supply?

Neither. It is the CPCI rack/chassis assembly that houses Mark VIe CompactPCI modules and distributes the required DC rails through the backplane.

4. Can the 336A4940CTP1 be hot-swapped?

Do not assume hot-swap capability for the complete rack. The assembly contains active power-distribution hardware and a backplane connected to multiple control modules. Follow the applicable GE Mark VIe shutdown and electrical-isolation procedure before rack replacement.

5. What power does the rack distribute?

GE documentation states that the CPCI power supply converts bulk incoming power into ±12 VDC, 5 VDC, and 3.3 VDC, which are distributed through the backplane to controllers and fans.

6. What warranty and technical support should I expect?

The quotation should clearly state whether the rack is new surplus, unused, or tested refurbished and specify the warranty duration. Technical support should cover exact rack identification, CTP1 versus verification, power-supply compatibility, backplane inspection, fan testing, and documented QC results. Mark VIe controller configuration, turbine application recovery, and field commissioning should remain separate engineering activities.