Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Reliance Electric |
| Part Number | 0-56942-1-CA |
| Product Family | GV3000 |
| Product Type | Regulator Board / Drive Control PCB |
| Application | Adjustable-frequency AC drive |
| Control Platform | GV3000 |
| Control Functions | Drive regulation and control |
| Option Architecture | Internal option slot / expandable I/O and communications |
| Associated Hardware | Super RMI and network option modules |
| User Interface | GV3000 keypad/display architecture |
| Mounting | Internal drive assembly |
| Lifecycle | Legacy / obsolete platform |
| Condition | New Surplus / Tested Refurbished |
The available documentation and parts listings consistently associate 0-56942-1-CA with the Reliance Electric GV3000 platform. One technical listing describes it as a GV3000 regulator board, while another identifies it as part of the GV3000 regulator-board family.
The platform supports V/Hz, Sensorless Vector Control (SVC), and Flux Vector Control (FVC) operating modes, depending on drive configuration. It also supports optional I/O and communications hardware through its expansion architecture.
Application Scenarios & Pain Points
A can look deceptively healthy during a bench inspection. The keypad may illuminate and the drive may accept commands while regulation becomes unstable once the motor is loaded. That is where a regulator-board diagnosis needs more than a simple power-up test.
Typical Applications
- Used as the regulator/control PCB within compatible Reliance Electric adjustable-frequency drives.
- Motor Speed Regulation: Relevant to drive applications where accurate speed, torque, acceleration, and deceleration control are required.
- Industrial Machinery: Suitable for legacy motor-control systems involving pumps, fans, conveyors, process machinery, and other variable-speed loads.
- Legacy Drive Repair: A tested 0-56942-1-CA can be valuable when the surrounding power section remains serviceable but the control/regulation electronics have failed.
Field Case:
A common mistake is replacing the regulator board after seeing an unstable speed condition without checking the feedback circuit. On a vector-controlled , encoder/feedback problems can imitate a regulator fault. Verify the feedback device, wiring, drive parameters, and control mode before condemning the PCB.
0-56942-1-CA
Related Products
- Reliance Electric 0-56942-1 — Closely related base designation for the regulator-board family. The complete -CA suffix should be matched against the installed board before substitution.
- Reliance Electric 0-56940-601 — Related Reliance regulator-board hardware. It appears in legacy /drive spare-parts inventories, but it should not be treated as a direct replacement without drive-specific confirmation.
- Reliance Electric 0-57100 — Related /drive control hardware. It serves a different functional role and should not be substituted for the regulator board.
- Reliance Electric 0-57170 — Another regulator-module designation found in the Reliance Electric legacy product family. The exact drive model and board function must be checked before substitution.
- Reliance Electric 0-54341-21 — Supporting Reliance drive-control hardware associated with the broader Reliance automation ecosystem. It is not automatically interchangeable with 0-56942-1-CA.
- Reliance Electric 0-52712 / 800756-21B — AutoMax-related output/control hardware. Useful in larger Reliance control architectures but functionally different from the regulator board.
- Reliance Electric 57C404C — AutoMax analog-input module. It can be relevant to a Reliance control system surrounding a drive, but it is an I/O module rather than a regulator PCB.
- Reliance Electric 57C413B — Related AutoMax-era control hardware. It belongs to the broader Reliance automation ecosystem rather than serving as a direct regulator-board replacement.
The Engineer’s Guide: Field Pitfalls to Avoid
⚠️ Do Not Assume Every Board With a Similar Number Is Interchangeable
Reliance used several regulator, logic, interface, and option-board assemblies across its legacy drive products.
How to avoid it: Photograph the installed PCB and record the complete 0-56942-1-CA marking, revision, drive catalog number, horsepower, input voltage, and installed option cards.
⚠️ Check the Control Mode and Feedback Hardware
installations can use V/Hz, SVC, or FVC control. Vector applications may also depend heavily on feedback configuration.
How to avoid it: Before replacing the PCB, record motor parameters, control mode, encoder/feedback settings, and drive parameter values. A board swap can restore hardware operation while leaving an incorrect parameter set.
⚠️ Do Not Ignore Option Cards
The architecture supports additional I/O and communication options. A replacement board must physically and electrically accommodate the configuration installed in the original drive.
How to avoid it: Photograph every option card and connector before removing the original regulator board. Check connector condition carefully—darkened pins or loose contacts can produce intermittent faults that look like PCB failure.
Frequently Asked Questions (FAQ)
What is Reliance Electric 0-56942-1-CA?
It is a regulator/control board used within compatible Reliance Electric adjustable-frequency drives. Available parts information identifies the part specifically with the family.
Is 0-56942-1-CA a complete drive?
No. It is an internal control/regulator PCB, not a complete drive. The drive’s power section, keypad, option cards, cooling system, and other assemblies remain separate.
What control modes are associated with the platform?
drives can support V/Hz, Sensorless Vector Control, and Flux Vector Control, depending on the specific drive and configuration.
That matters during troubleshooting because a feedback or parameter problem can sometimes resemble a regulator-board failure.
Can I replace 0-56942-1-CA with another Reliance regulator board?
Not without verification. Similar-looking Reliance boards can have different drive applications, firmware/configuration requirements, connector arrangements, or functions.
Before ordering:
- Record the complete drive model.
- Photograph the original PCB.
- Record the board revision.
- Identify all option cards.
- Save the drive parameter set.
- Confirm the replacement board against the exact drive configuration.
What should I request when buying a refurbished 0-56942-1-CA?
Request:
- Actual board photographs
- Complete 0-56942-1-CA marking
- PCB revision/date code
- Connector photographs
- Option-card compatibility confirmation
- Inspection for capacitor leakage and heat damage
- Functional test information
- Parameter/configuration retention information, where applicable
- ESD-safe packaging
- Warranty terms
A supplier saying “tested” without explaining what was tested is not enough for this type of board.
Is 0-56942-1-CA still a current product?
No. The is a legacy Reliance Electric drive platform, so procurement today generally involves existing inventory, surplus units, repaired assemblies, or refurbished boards. Current parts listings still identify 0-56942-1-CA within Reliance Electric inventories.
What is the biggest replacement risk?
Configuration mismatch. The PCB may physically fit while the drive’s control mode, feedback setup, option hardware, or firmware/configuration does not match the replacement.
For a production-critical , preserve the original parameter data and photograph the complete assembly before removing the board. That small amount of documentation can save hours of commissioning work later.
