Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Reliance Electric |
| Part Number | 0-57170 |
| Product Type | Regulator / Control Board |
| Product Family | MinPak Plus |
| Application | DC variable-speed drive |
| Primary Function | Drive regulation and control |
| Mounting | Internal drive PCB assembly |
| Platform | MinPak Plus |
| Lifecycle | Legacy / discontinued |
| Condition | New Surplus / Tested Refurbished |
Available technical records identify 0-57170 as a Reliance Electric MinPak Plus regulator board. The same records classify it as a legacy/discontinued drive-board assembly. (axcontrol.com)
Because public information on this particular board is limited, I would not assign a specific input/output voltage, horsepower range, or firmware revision without the original MinPak Plus documentation or the drive nameplate. That is preferable to turning an unverified database value into a procurement specification.
Application Scenarios & Pain Points
With older MinPak Plus equipment, the difficult part is often not finding a board—it is proving that the board actually caused the fault. A drifting speed signal, poor tachometer feedback, or an oxidized connector can produce symptoms remarkably similar to a regulator failure.
Typical Applications
- MinPak Plus DC Drives: Used as regulator/control hardware within compatible Reliance Electric MinPak Plus drive assemblies.
- Motor Speed Control: Relevant to legacy DC motor applications where the regulator maintains the commanded operating response.
- Industrial Machine Retrofits: Useful when a plant wants to retain an existing DC drive rather than redesigning the entire motor-control cabinet.
- Maintenance Spare: A tested spare can shorten recovery time when an obsolete drive PCB fails unexpectedly.
Field Case:
A technician may see a motor hunting around its commanded speed and immediately blame the regulator. Before changing the board, measure the reference and feedback signals at the drive terminals. If the feedback is noisy, replacing a perfectly good 0-57170 will accomplish very little.
0-57170
Related Products
- Reliance Electric 0-57100 — Another MinPak Plus regulator/control board. It belongs to the same general drive family, but its complete part number and circuit configuration differ from 0-57170; direct substitution requires documentation confirmation.
- Reliance Electric 0-57100-J — Related 0-57100-family control assembly. The suffix indicates a specific hardware configuration and should not be treated as equivalent to 0-57170.
- Reliance Electric 0-56942-1-CA — GV3000 regulator board. It serves a different Reliance drive family and is relevant only when maintaining GV3000 equipment, not as a direct MinPak Plus substitute.
- Reliance Electric 0-54341-21 — Legacy DC coil-driver hardware associated with contactor control. It can be part of the surrounding drive cabinet but performs a different function from the 0-57170 regulator.
- Reliance Electric 0-52712 / 800756-21B — AutoMax/UDC-related output/control hardware. It belongs to another part of the Reliance control architecture and should not be substituted for a MinPak Plus regulator.
- Reliance Electric 0-60021-4 — AutoMax PMI processor module. It provides processing functions rather than MinPak Plus regulation.
- Reliance Electric 0-60031-5 — Resolver/Drive I/O module for AutoMax PMI systems. It handles interface and feedback functions rather than the regulator role of 0-57170.
The Engineer’s Guide: Field Pitfalls to Avoid
⚠️ Do Not Assume 0-57100 and 0-57170 Are Interchangeable
The two numbers are close enough to cause procurement mistakes, particularly in old inventory databases.
How to avoid it: Match the complete PCB number, drive model, connector arrangement, and original board markings. Do not approve a substitution based on the MinPak Plus name alone.
⚠️ Do Not Diagnose the Regulator Board From Speed Instability Alone
Speed hunting can originate from the tachometer, feedback wiring, speed reference, motor, or adjustment circuitry.
How to avoid it: Check reference and feedback signals first. Record the original adjustment-potentiometer positions before making changes.
⚠️ Inspect the PCB Before Applying Power
A board that has spent 20–30 years inside a cabinet can develop oxidized connectors, cracked solder joints, deteriorated capacitors, or heat-stressed components.
How to avoid it: Inspect both sides of the PCB, especially connector contacts and areas around heat-generating components. Use proper ESD handling; these boards contain semiconductor devices that can be damaged before the first diagnostic test.
Frequently Asked Questions (FAQ)
What is Reliance Electric 0-57170?
0-57170 is a Reliance Electric MinPak Plus regulator/control board used within compatible legacy DC variable-speed drive systems. (axcontrol.com)
Is 0-57170 a complete MinPak Plus drive?
No. It is a board-level control/regulator assembly installed inside the drive. The power section, enclosure, keypad/control interface, contactors, and other hardware are separate components.
Can 0-57100 replace 0-57170?
Do not assume so. Both are associated with MinPak Plus control hardware, but they have different part numbers and may have different circuitry, revisions, or drive applications.
Before substitution, compare:
- Complete drive model.
- Original PCB number.
- Board revision.
- Connector arrangement.
- Drive wiring diagram.
- Functional requirements.
What should I request when buying a refurbished 0-57170?
Request actual photographs showing:
- Complete 0-57170 marking
- PCB revision
- Front and rear sides
- Connector condition
- Potentiometers and adjustment hardware
- Evidence of power-up testing
- Functional regulator testing
- Inspection for heat damage
- Warranty terms
For an obsolete regulator board, “tested” should include a meaningful functional test rather than only visual inspection.
Is 0-57170 still manufactured?
Available technical records classify 0-57170 as a discontinued/legacy Reliance Electric board. (axcontrol.com)
That makes inventory condition important. New-surplus stock and refurbished units should be clearly distinguished during procurement.
What are common symptoms that may point toward a bad 0-57170?
Potential symptoms include:
- Incorrect speed regulation
- Unstable motor response
- Failure to respond correctly to a speed reference
- Intermittent drive-control behavior
- Regulation-related faults
None of these proves the PCB is defective. Feedback, reference wiring, motor condition, and adjustment settings should be checked first.
What is the biggest procurement risk?
Ordering a visually similar Reliance regulator board without matching the exact drive configuration. With legacy MinPak Plus equipment, the complete 0-57170 number should be treated as the starting point, followed by verification of the original drive model and PCB revision.
