Ottoman production site
9 month ago
100HP Fixed Speed Screw Air Compressor
At 100HP the question changes from "can it keep up" to "how many machines can it feed at once". A 75 kW industrial screw air compressor like the SA-100A sits at the centre of a plant and runs a header that reaches injection molding, machining, spray booths and assembly stations together. Sizing starts from the combined draw of everything that opens a valve at the same time, and this frame is the one most mid-size plants land on after outgrowing a 60HP unit.
The motor starts on a star-delta arrangement, and that detail matters at this power. A direct-on-line start at 75 kW pulls a current spike that dims the lights and trips weak breakers. Star-delta ramps the motor through a reduced-voltage stage first, then switches to full run, so the inrush stays manageable and the supply transformer is not hammered on every restart. It is a small switch that saves real trouble on the electrical side.
Heat is the other thing that grows with power. The SA-100A holds its operating temperature between 75 °C and 92 °C through a larger radiator and cooling fan, and the control panel watches oil temperature, pressure and running current together. If one of them drifts outside the set range, the machine flags it and shuts down before it becomes a failure, which is what keeps a 24-hour plant from losing a shift to an overheat trip.
The applications split along two lines. Injection molding wants long, flat pressure with no dips, because a dip mid-cycle leaves a short shot in the mould. A screw air compressor for injection molding feeds the clamp and the eject cycle on the same steady supply. Metal fabrication, spray coating, textile and automated lines want the same thing for different reasons: consistent air so the tool, the gun, the loom or the robot never waits on pressure.
A 100 hp three phase rotary screw compressor is usually delivered as a set, not a bare machine. The standard package puts a receiver of 1.0 m³, a refrigerated air dryer of 15 m³/min and a three-stage filter train after the unit, so the line gets dry, filtered air instead of whatever came out of the tank. Service runs on a fixed rhythm: routine parts every 2,000 hours and a full overhaul at 8,000, which turns maintenance from a guess into a schedule. On the electrical side, the unit draws a 100A air switch and 35 mm² copper cable as standard, with heavier cable for long runs.
Advantages
- Star-delta start keeps the inrush low: the motor ramps through reduced voltage first, so it does not dim the lights or trip breakers on startup
- One machine for a whole department: 75 kW feeds injection molding, machining, spray booths and assembly from a single header
- Held temperature range: runs between 75 °C and 92 °C on a larger radiator and fan, with the controller watching temperature, pressure and current
- Three published delivery figures: 12.8 / 11.2 / 10.2 m³/min at 0.8 / 1.0 / 1.2 MPa, so you size against a real number, not a headline
- Factory tested before dispatch: every unit passes air-tightness and full-load testing before it ships
- Delivered as a package: 1.0 m³ receiver, 15 m³/min dryer and three-stage filtration come quoted with the machine
- Fixed service schedule: routine parts at 2,000 hours, full overhaul at 8,000, so maintenance is planned, not reactive
Why Choose Us
- Factory direct since 2006: the SA-100A ships from the OSMAN plant in Shenzhen, and questions go to the people who assembled it
- The fixed-speed range is a core line: it runs from 7.5 kW to 250 kW, so the service procedures and consumables stay the same as your fleet grows
- Complete system from one supplier: compressor, tank, dryer and filters quoted together, keeping sizing and warranty on one document
- Installation support included: we confirm the right air switch, cable cross-section and pipe run for your site before the unit is delivered
- Sizing matched to your load: send us your machine list and working hours and we will confirm whether 100HP is the right frame or the next one up is cheaper over five years
- Export packing and terms handled: sea-freight packing as standard, with FOB, CIF or DDP quotes depending on how you clear customs
FAQ
Q1: What are the rated specifications of the SA-100A?
A：75 kW (100 HP), 380 V three-phase 50 Hz, single-stage direct drive, air cooled, star-delta start. Working pressure is 0.8 to 1.2 MPa, and free air delivery is 12.8 m³/min at 0.8 MPa, 11.2 m³/min at 1.0 MPa, and 10.2 m³/min at 1.2 MPa. Other voltages can be built to order.
Q2: What cable and air switch does the 100HP unit need?
A：A 100A air switch and 35 mm² national-standard copper cable are the recommended configuration for 75 kW. For long cable runs, use heavier cable to keep voltage drop in check, and give the unit an independent supply so it does not share a breaker with other equipment.
Q3: What does the star-delta start do for the machine?
A：It ramps the motor through a reduced-voltage stage before switching to full voltage, which keeps the startup current spike low. At 75 kW a direct-on-line start can dip the supply and trip breakers; star-delta avoids that and protects the transformer.
Q4: How many machines can the SA-100A feed at once?
A：It depends on the combined air draw of everything running at the same time. At 0.8 MPa the unit delivers 12.8 m³/min, which covers a mixed load of injection molding, machining and assembly tools in most mid-size plants. Send us your machine list and we will confirm the load against the delivery figures.
Q5: Will it trip on high temperature in a hot plant?
A：It is designed not to. The unit holds an operating temperature between 75 °C and 92 °C on a larger radiator and cooling fan, and the controller monitors oil temperature, pressure and running current. If any value leaves the set range, the machine shuts down before an overheat becomes a failure.
Q6: What is the service schedule for the SA-100A?
A：Routine parts are replaced every 2,000 operating hours, and a full overhaul comes at 8,000 hours. The schedule is based on running hours and site conditions, so we set it against your operation when the machine is delivered, and the consumables are held in factory stock.
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