Lifting platforms · Boosting positions · Magazine lifting · Fixture lifting · Multi-height presets · Upper/lower limit protection · Self-locking + brake dual protection · No PLC, no programming
Lifting platforms, boosting positions, magazine lifting, fixture lifting — the motion itself is easy; what matters is safety: a load stopped mid-air must not creep, power loss must not drop it, and the upper/lower limits must respond reliably.
This solution is built on the SD6 integrated drive & control closed-loop stepper driver: multiple heights are stored as multi-segment parameters, triggered by buttons or signals; trapezoidal screw self-locking + brake interlock provide dual protection against dropping; upper/lower limits and the origin connect straight to driver IO — any over-travel stops immediately. No PLC, no programming: height is just a number on the panel.
Self-locking screw handles "no drop at power loss"; brake interlock makes "stops hold steadier" — two independent layers of protection
Different stations need different platform heights? Store them as multi-segment parameters, recall and arrive (example values):
| Segment | Target Height (mm) | Speed (mm/s) | Purpose |
|---|---|---|---|
| Seg 1 | 0 (lower stop) | 30 | Home / load position |
| Seg 2 | 60 | 40 | Transfer position |
| Seg 3 | 120 | 40 | Assembly position |
| Seg 4 | 180 (upper stop) | 25 | Top position (slow profile prevents overshoot) |
Example values; the rising segment slows at the end to prevent overshoot, the falling segment slows to prevent impact — both are accel/decel parameters
Upward: load opposes motion, torque demand = gravity component + friction, motor sized at 1.5～2× margin; downward: the load assists the motor, so descent speed must be kept low and holding torque sufficient to prevent "slipping down". A self-locking trapezoidal screw (lead angle below the friction angle) locks mechanically at standstill; non-self-locking mechanisms should add a brake, whose release/close is interlocked with the driver's brake output — release to run, close at stop, timing managed automatically.
| Signal | Direction | Function |
|---|---|---|
| Up / Down buttons | DI inputs | Jog, or trigger the corresponding height segment |
| Height select | DI inputs | Multi-segment recall (combinational coding optional) |
| Origin switch | DI input | Lower-stop datum, rebuilds the height coordinate |
| ± Limits | DI inputs | Hard over-travel protection, stop on trigger |
| Brake control | DO output | Interlocked with enable/stop status |
| Done / alarm | DO outputs | Height reached feedback and anomaly alert |
Point count and terminal definitions per SD6 specification
| Item | Pneumatic + PLC | SD6 Electric Lifting |
|---|---|---|
| Height adjustability | Magnetic switch positions, coarse adjustment | Panel numeric setting, millimeter level |
| Multi-height | More cylinders = more positions | One motor, multi-segment presets |
| Anywhere stop | Difficult (two-position by nature) | Any height, positioned and held |
| Power-off state | Air pressure maintains | Self-locking screw / brake holds |
| Air supply | — | Pure electric, no air source required |
"Stop anywhere + millimeter adjustability" is precisely the structural weakness of pneumatic lifting
Two lines of defense: first, specify a self-locking trapezoidal screw (lead angle below the friction angle) — mechanically locked at power loss; second, configure a brake interlocked with the driver's brake output — closed whenever stopped. With both, power loss does not mean falling.
First verify the current limit matches the motor rating, then recheck load torque vs margin; for sustained heavy loads increase the reduction ratio or step up the motor frame — never rely on prolonged stalling to "push through".
Low-speed resonance or guide friction: increase microstepping, reduce speed in that band, and lubricate the guides. For vertical installation, always confirm screw self-locking or brake effectiveness before commissioning.
Yes. Done/alarm DO signals report to the main control; height segments can be called by signal combinations; multiple lifters also support Modbus RTU networking for centralized dispatch.
The power-off anti-drop test is a mandatory acceptance item: full load stopped mid-air, power off, observe for 10 minutes