Stop Screw Conveyor Jams Before They Stop Your Cotton Gin – Install a Bolec SS501 Speed Switch
In every cotton gin, a few machines cause the majority of unplanned shutdowns.
After speaking with operators and reviewing maintenance data, here are the most failure-prone machines in a typical gin:
- Screw Conveyors — clogging, torque overload, sudden speed drops
- Belt Conveyors — belt slippage, misalignment, stalled pulleys
- Blowers & Fans — belt breakage, impeller fouling, speed loss
- Lint Cleaners — fibre packing and roller choking
- Gin Stands — foreign object ingestion causing blade lock
Why Screw Conveyors Fail More Than Anything Else
Screw conveyors move seed cotton and lint between multiple stages in the gin.
Moisture, trash, leaves, stems and fibre lumps frequently build up inside the trough.
Before operators notice anything, the auger begins to slow down — and then suddenly stalls.
A single blocked auger can:
- Shut down the entire line
- Overload motors and gearboxes
- Cause backup all the way to the extractor feeder
- Waste hours of production during peak season
And all of that can be prevented with one small device.
The SS501 Speed Switch – Proven Protection for Screw Conveyors
If you want to prevent jams and dramatically reduce downtime, the Bolec SS501 Dual Channel Speed Switch is the simplest and most cost-effective solution.
Price: Just A$275
Compare that to the cost of:
- A full plant shutdown (thousands of dollars per hour)
- Burned-out motors
- Gearbox failures
- Labour required to dig out packed cotton
A$275 is a tiny investment for preventing huge losses.
How SS501 Protects Your Screw Conveyors
The SS501 continuously monitors shaft rotation using a magnetic pickup.
It instantly detects:
- Underspeed caused by fibre build-up
- Zero speed when the shaft stalls
- Belt slippage (motor spinning but auger isn’t)
Once the speed drops below the preset threshold, the SS501 can:
- Trigger a loud alarm or beacon
- Stop the upstream feeder
- Shut down the conveyor motor to prevent mechanical damage
It works completely independent of PLC or CANbus systems, making it a reliable secondary safety layer.
How to Install an SS501 on a Screw Conveyor
1. Select the Sensing Point
Install the magnetic pickup facing:
- The screw conveyor shaft (most accurate)
- The drive pulley or sprocket
- A metal target—such as a bolt or gear tooth—mounted on a rotating part
2. Set the Air Gap
Keep the pickup approximately 1–2 mm from the rotating target.
3. Wiring
- Power: 12–24 VDC
- Input: Magnetic pickup sensor
- Output: Relay to alarm or motor stop circuit
4. Configure Trip Speed
Most gins set the trip point at 60–80% of normal RPM.
Example: A 1000 RPM auger might trip at 650–700 RPM.
5. Test the System
- Run empty → verify stable RPM
- Run under cotton load → verify reading
- Simulate a slowdown → confirm SS501 triggers
A Small Device That Saves Thousands
Every cotton gin knows the cost of downtime.
One jammed screw conveyor can cost more than an entire season’s worth of SS501 units.
For only A$275, you can stop jams before they damage motors, gearboxes, or your production schedule.
The SS501 is affordable, rugged, and easy for any licensed electrician to install.
Ask your local sparky to fit one during your next maintenance window.
Order Your SS501 Today
➡ Order here: Bolec SS501 Dual Channel Speed Switch
Or contact us for installation advice:
Email: sales@bolec.com.au