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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Axes | 1 |
| Drive type | 2-phase stepper motor |
| Microstep resolution | 1/2048 full step |
| Operating voltage | 24–48 V DC |
| Max. output power | 60 W |
| Average output power | 48 W |
| Current limit per phase | 2.5 A |
| Servo cycle time | 50 µs |
| Controller type | PID (parameters changeable during operation) |
| Encoder input | A/B quadrature, TTL / RS-422, up to 60 MHz |
| Limit switches | 2 × TTL, programmable |
| Reference switch | 1 × TTL, programmable |
| Communication | USB, RS-232 |
| Network capability | Up to 16 units via daisy chain |
| I/O | 4 analog/digital inputs, 4 digital outputs |
| Command set | PI General Command Set (GCS) |
| Ambient temperature | 0 °C to +50 °C (typical) |
4. Product Introduction
The PI C-663.12 is a compact single-axis Mercury Step controller designed for precise open-loop and closed-loop operation of 2-phase stepper motors.
It delivers up to 1/2048 microstep resolution for smooth, high-resolution motion and supports encoder feedback for true closed-loop control. With a supply voltage up to 48 V and 2.5 A per phase, it provides enough power for fast positioning while remaining networkable—up to 16 units can share one USB or RS-232 interface. The unit uses the standard PI GCS command set and is fully supported by PIMikroMove software, making it a direct replacement for existing Mercury Step installations in laboratory and industrial micropositioning systems.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Motor does not move | Enable or current limit | ✅ High | Check enable input and current settings | Verify wiring and parameter values |
| Position error / stall | Encoder feedback missing | ✅ High | Scope A/B encoder signals | Confirm sensor connection and scaling |
| No communication | USB/RS-232 cable or baud rate | ✅ Medium | Test with PIMikroMove, check COM port | Use correct cable and settings |
| Overtemperature / current trip | Motor overload or wrong current | ✅ High | Measure motor current and heatsink temp | Reduce current limit or improve cooling |
| Limit switch not recognized | Wiring or polarity | ✅ Medium | Check limit switch logic levels | Reverse or reconfigure switch polarity |
| Daisy-chain fails | Network termination or address | ❌ Low | Verify unique addresses and termination | Set unique IDs before connecting |
If the fault persists, photograph the type plate, LED status and connector wiring, then contact technical support with the diagnostic data.
C-663
C-663
6. Frequently Asked Questions (FAQ)
Q: Can the C-663.12 run in both open-loop and closed-loop mode?
A: Yes. Open-loop microstepping is standard. Closed-loop operation requires an incremental encoder connected to the sensor input; the controller then uses PID feedback to eliminate step loss.
Q: How many controllers can I network together?
A: Up to 16 units can be daisy-chained on a single USB or RS-232 interface. Each unit must have a unique address.
Q: Is the C-663.12 a direct replacement for older C-663 versions?
A: The C-663.12 is the current production model with higher microstep resolution (1/2048) and 48 V capability. Parameter and connector compatibility is high, but always verify the exact firmware and pin-out against the original unit.
Q: Does the application stay when I replace the controller?
A: Macros and parameters can be stored in non-volatile memory or on the host PC. Transfer the parameter file with PIMikroMove or reload the startup macro after installation.
Q: Why is a surplus unit priced lower than a new factory unit?
A: The C-663 series has been in production for many years. New-surplus stock is unused original material that still meets the full electrical and motion specification. Every unit is functionally tested before shipment.
Q: Any common installation traps?
A: Confirm motor phase wiring polarity, set the correct current limit before enabling, and use shielded encoder cables grounded at one end only. A clear photo of the original connectors before removal prevents most commissioning delays.
