INOMAX ACS580 & ACS880 – Plastic Machinery Solutions
High-Performance Variable Frequency Drives for Extruders, Blow Molding Machines, Pelletizers & Film Lines
Overview
Plastic processing is one of the most energy‑intensive manufacturing sectors. Extruders run continuously, often 24/7. Blow molding machines cycle rapidly. Film lines operate at high speeds with precise tension control. In every case, the electric motors driving screws, rollers, winders, pumps and fans represent a significant portion of operating costs. Traditional fixed-speed motors with mechanical controls waste energy, produce excessive noise, and lack the precision needed for consistent product quality.
At Inomax Technology, we supply ACS580 (general purpose) and ACS880 (high-performance) variable frequency drives to plastic machinery OEMs, retrofitters, and processors worldwide. Our drives are engineered for demanding plastic applications: extruder screw control with constant torque over wide speed range, blow molding parison programming with fast dynamic response, film winding tension control with taper tension algorithms, multi-motor synchronization for complete production lines, and energy savings of 20-50% on pumps and fans.
We are also actively expanding our global partner network. If you are a distributor, system integrator, plastic machinery OEM, or retrofit specialist, we invite you to explore a partnership with INOMAX – factory‑direct pricing, technical support, market protection, and proven technology trusted by processors worldwide.
Why Plastic Machinery Needs High-Performance VFDs
Extruders – Continuous, Constant Torque Demands
Extruder screw drives must deliver constant torque across a wide speed range – from low speeds for gentle mixing to high speeds for maximum throughput. A VFD allows precise speed regulation (±0.5% open loop, ±0.01% closed loop), ensuring consistent melt quality and dimensional stability. Pressure sensors can close the loop to maintain constant head pressure, reducing scrap and improving product consistency.
Energy savings on extruder screw drives are limited (the screw still does the same work), but VFDs enable soft starting (eliminating inrush current), improve power factor (reducing utility penalties), and allow precise control for different material formulations.
Blow Molding – Parison Programming & Fast Cycling
Blow molding machines require precise control of extruder screw speed, accumulator head speed, and clamp movement. For continuous extrusion blow molding, parison programming adjusts the die gap during extrusion to vary wall thickness along the parison – requiring fast, repeatable control of servo‑hydraulic valves (often using analog outputs from the VFD). For reciprocating screw machines, the screw must retract and inject precisely.
Our ACS880 drives provide <5 ms torque response and full torque at zero speed, enabling smooth, precise control of parison thickness and clamp movements. Energy savings on hydraulic pumps (using VFD-controlled variable-speed pumps) typically reach 30-50%.
Film & Sheet Lines – Multi-Section Synchronization
Film extrusion lines include multiple driven sections: extruder, nip rolls, haul‑off, treater, slitter, winder. All sections must run at precisely coordinated speeds to maintain film tension and prevent wrinkling or stretching. Our drives support electronic line shaft and master‑slave synchronization via Profinet IRT or EtherCAT, with programmable draw ratios and real‑time tension feedback.
Winding & Unwinding – Tension Control
Plastic film, sheet, and tape must be wound into rolls with consistent tension to prevent telescoping, crushing, or stretching. Our drives include closed‑loop tension control (load cell or dancer feedback), taper tension algorithms (reducing tension as roll diameter increases), and diameter calculation (via line speed / roll RPM). Regenerative AFE drives on unwinds return >95% of braking energy to the grid.
Pelletizers – High-Speed, Precise Cutting
Underwater pelletizers and strand pelletizers require precise synchronization between extruder screw speed, cutter speed, and pellet length. Our drives support electronic gearing (master‑slave position synchronization) and high-speed pulse train inputs for precise cutter control.
Key Technologies – Professional Solutions for Plastic Machinery
1. Constant Torque Control for Extruder Screws
Extruder screws are constant torque loads – the torque required is independent of speed. Both ACS580 and ACS880 provide constant torque ratings (150% overload for 60s) across the entire speed range, ensuring reliable screw drive performance even at low speeds where material viscosity is highest.
Key parameters for extruder screw drives:
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Speed accuracy – ±0.5% open loop (ACS580), ±0.1% open loop (ACS880), ±0.01% closed loop (ACS880 with encoder)
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Torque limit – Programmable torque limit protects screw and gearbox from overloading
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Speed range – Full torque from 0.5 Hz (ACS580) or 0 Hz (ACS880) up to 500 Hz (or higher with options)
2. Parison Programming – Fast, Repeatable Analog Outputs
For blow molding, the die gap must be modulated during extrusion to create variable wall thickness. Our drives provide high-speed analog outputs (0-10V or 4-20mA) that can follow a programmed profile synchronized with screw position or time. The analog output can be updated every 2 ms – fast enough for precise parison programming.
Implementation:
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The machine controller sends a parison profile (position vs. gap) to the drive via fieldbus
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The drive’s built‑in PLC executes the profile, sending analog output to the servo‑valve
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Closed‑loop pressure control (via pressure transducer feedback) maintains consistent extrusion
3. Multi-Motor Synchronization for Complete Lines
Film, sheet and pipe lines have multiple driven sections that must run in precise speed ratio. Our drives support:
| Synchronization Method | Accuracy | Best for |
|---|---|---|
| Electronic gearing (master‑slave over fieldbus) | <1 μs | Film lines, multi‑extruder co‑extrusion |
| Analog speed follower (0-10V broadcast) | ±0.5% | Simpler lines, retrofits |
| Pulse train follower (encoder pulse output) | ±1 encoder count | High‑precision positioning |
| XD2D drive‑to‑drive link | <5 ms torque response | Coupled shafts (e.g., twin screw extruders) |
4. Tension Control for Winders & Unwinders
Film winders require precise tension control to produce uniform rolls. Our drives feature:
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Closed‑loop tension PID – Using load cell or dancer feedback (0-10V or 4-20mA)
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Taper tension algorithm – Automatically reduces tension as roll diameter increases (linear or parabolic taper)
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Diameter calculation – Via line speed / roll RPM or ultrasonic sensor
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Regenerative braking (ACS880 AFE) – Unwind stand returns >95% of braking energy to the grid
Typical winder setup:
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Unwind drive in torque control (regenerative) – maintains constant back tension
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Haul‑off drive in speed control – sets line speed
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Rewind drive in torque control (motoring) – winds with taper tension
5. Regenerative AFE – Energy Recovery for Unwinds & Downhill Conveyors
In film lines, the unwind stand regenerates energy as the roll pays off. Traditional systems waste this energy as heat in braking resistors. Our ACS880 AFE drives return >95% of this energy to the grid, significantly reducing plant electrical costs. For lines with frequent starts and stops, the AFE also maintains constant DC bus voltage, eliminating nuisance overvoltage trips.
6. Fieldbus Integration for Complete Line Control
Plastic processing lines are typically controlled by a central PLC or DCS. Our drives support all major protocols:
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Profinet IO / Profinet IRT – For Siemens‑based lines (most common in Europe and Asia)
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EtherNet/IP – For Rockwell‑based lines (common in North America)
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EtherCAT – For Beckhoff‑based lines (high‑performance synchronization)
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Profibus DP – For legacy lines
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CANopen – For many European plastic machinery OEMs
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Modbus RTU/TCP – For universal compatibility
We provide GSDML, ESI, and EDS files for seamless integration.
Product Series Overview
| Series | Power Range | Control Technology | Ideal Plastic Machinery Applications |
|---|---|---|---|
| ACS580 | 0.75 kW – 500 kW | Sensorless vector control | Extruder screw drives (≤500 kW), haul‑off rolls, cooling fans, pumps, blowers |
| ACS880 | 55 kW – 6,000 kW | Direct Torque Control (DTC) | Large extruders (>55 kW), film winders, multi-section lines, high‑performance applications |
| ACS880 AFE | 55 kW – 6,000 kW | DTC with active front end | Regenerative unwinds, energy recovery, ultra‑low harmonic requirements |
Selection guide:
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Choose ACS580 for standard extruder screw drives, auxiliary pumps, fans, and cost‑sensitive applications
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Choose ACS880 for large extruders, multi-motor synchronization, high‑speed winders, and applications requiring regenerative energy recovery
Technical Specifications – Professional Grade
ACS580 Series (Cost‑Effective for Standard Plastic Machinery)
| Parameter | Specification |
|---|---|
| Power range | 0.75 kW – 500 kW |
| Voltage | 3-phase 380–480 VAC |
| Control method | Sensorless vector control (SVC) + V/F |
| Torque step rise time | <20 ms |
| Starting torque | 150% at 0.5 Hz |
| Overload capacity | 150% for 60s (constant torque) |
| Speed accuracy (open loop) | ±0.5% |
| Built-in PID | Yes (2 independent) |
| Tension control | Basic (open‑loop torque or speed) |
| Communication | Modbus RTU, CANopen standard; Profibus, Profinet, EtherNet/IP optional |
| Conformal coating | Standard |
| Enclosure | IP20 standard; IP55 optional |
ACS880 Series (High‑Performance for Demanding Plastic Lines)
| Parameter | Specification |
|---|---|
| Power range | 55 kW – 6,000 kW (single); up to 50 MW multidrive |
| Voltage | 3-phase 380–690 VAC |
| Control method | Direct Torque Control (DTC) |
| Torque step rise time | <5 ms (open loop), <5 ms (closed loop) |
| Starting torque | 200% at 0 Hz (no encoder required) |
| Overload capacity | 200% for 60s, 250% for 30s |
| Speed accuracy (open loop) | ±0.1% of motor slip |
| Speed accuracy (closed loop) | ±0.01% of nominal speed |
| Electronic gearing | Yes (master‑slave position synchronization) |
| Electronic cam | Yes (for flying knives, cutters) |
| Tension control | Closed‑loop PID with dancer/load cell, taper tension |
| Regenerative AFE option | THDi <5%, unity PF, >95% energy recovery |
| Common DC bus | Yes (multidrive architecture) |
| Communication | Modbus, CANopen standard; Profinet IRT, EtherCAT, EtherNet/IP optional |
| Conformal coating | Standard |
Real Projects – Proof of Performance
Our drives are used by plastic machinery OEMs, retrofitters, and processors worldwide.
| Customer | Application | Machine Type | Drive Series |
|---|---|---|---|
| Major film line manufacturer (China) | 5-layer blown film line – extruders, nip, winder | Film extrusion | ACS880 multidrive |
| Pipe extrusion line (Turkey) | 250 kW extruder + haul‑off + saw | Pipe extrusion | ACS880 |
| Blow molding machine builder (Europe) | Parison programming + clamp hydraulics | Blow molding | ACS880 AFE |
| Recycling pelletizer (USA) | Extruder + underwater pelletizer synchronisation | Pelletizing | ACS580 + ACS880 |
| Flexible packaging converter (India) | Slitter rewinder with tension control | Film converting | ACS880 |
| Masterbatch producer (Middle East) | 500 kW twin‑screw extruder | Compounding | ACS880 AFE |
Measured results:
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Energy savings on hydraulic pumps: 30-50% (variable-speed vs. fixed-speed)
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Unwind regenerative energy recovery: 85-95% of braking energy returned to grid
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Winder roll quality: telescoping eliminated, uniform roll hardness
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Line speed increase: up to 15% with electronic line shaft synchronization
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Payback period: 6-18 months depending on duty cycle
For Distributors, System Integrators & Plastic Machinery Specialists
Why Partner with INOMAX?
| Your Concern | Our Answer |
|---|---|
| Product quality | ISO9001, CE, UL certified; conformal coating standard; <1% first-year failure rate |
| Price competitiveness | Factory-direct pricing – 20-30% lower than ABB/Siemens/Danfoss equivalents |
| Lead time | Stock for popular models (3-5 days); custom units 2-4 weeks |
| Technical support | Dedicated application engineers; pre-sales sizing; remote diagnostics; on-site commissioning (fee-based) |
| Warranty | 2 years standard; extended to 5 years available |
| Market protection | Exclusive territory or project registration available – we will not compete with you on registered projects |
| Customization | OEM branding, parameter presets for specific machine types, special enclosures |
| Training | Product training, plastic machinery application workshops, commissioning support |
| Spare parts | Global stock; priority access to critical spares |
Partnership Models
| Model | Description | Best for |
|---|---|---|
| Distributor | Stock and sell INOMAX drives in your territory | Companies with existing sales channels to plastic processors and OEMs |
| Retrofit specialist | Use INOMAX drives for energy-saving retrofits of extruders, winders, hydraulic systems | Companies that upgrade existing plastic lines |
| Machine builder (OEM) | Specify INOMAX drives in new plastic machinery | OEMs wanting a cost‑effective, high‑performance drive partner |
| System integrator | Use INOMAX drives in complete production line solutions | Panel builders, automation integrators |
Distributor Support Program
| Support | Description |
|---|---|
| Technical training | Online and in-person training on drive selection, installation, commissioning, troubleshooting |
| Application engineering | Free pre-sales support for your customers – sizing, configuration, tension control tuning |
| Marketing materials | Datasheets, brochures, application notes, energy savings calculators – ready for your use |
| Demo units | Loaner units for customer trials and trade shows |
| After-sales support | Remote diagnostics, RMA processing, spare parts priority |
| Volume discounts | Tiered pricing based on annual commitment |
Frequently Asked Questions
For End Users (Technical)
Q1: How much energy can I save by adding a VFD to my plastic extruder?
For the extruder screw itself, energy savings are modest (5-10%) because the screw still does the same mechanical work. However, VFDs provide other benefits: soft starting (eliminating inrush current), improved power factor (reducing utility penalties), precise speed control for consistent melt quality, and the ability to optimize speed for different materials. The biggest energy savings come from adding VFDs to auxiliary equipment: hydraulic pumps (30-50% savings), cooling fans (30-50% savings), and blowers (20-40% savings).
Q2: Can I use a VFD for parison programming on a blow molding machine?
Yes – and many blow molding machine builders do. Our drives provide high-speed analog outputs (update every 2 ms) that can follow a programmed profile synchronized with screw position. The analog output (0-10V or 4-20mA) controls a servo‑valve that modulates the die gap. This eliminates the need for a separate motion controller for parison programming.
Q3: How do I set up tension control for a film winder using ACS880?
Our drives include dedicated winder/unwinder software macros. Step-by-step:
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Select the winder macro (parameter preset)
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Connect dancer or load cell feedback to analog input
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Set core diameter and full roll diameter
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Set starting tension and ending tension (taper)
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Enable diameter calculation (line speed / roll RPM)
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Run auto‑tune for PID parameters
The drive will automatically maintain constant tension as the roll builds.
Q4: What is electronic gearing and how does it benefit film lines?
Electronic gearing allows one drive (master) to broadcast its position or speed to other drives (slaves). The slave drives follow the master with a programmable gear ratio (e.g., 1.2345:1). This eliminates mechanical line shafts and allows draw ratios to be changed on the fly via HMI. For co‑extrusion lines, each extruder can run at a different speed ratio to control layer thickness.
Q5: Can ACS880 drive a twin-screw extruder with two motors?
Yes. Twin-screw extruders often have two motors driving the two screws through gearboxes. Our master‑slave torque control ensures perfect load sharing: one drive operates in speed control, the other in torque control receiving torque reference from the master. This eliminates mechanical binding and uneven wear on the screws.
Q6: What is the expected service life of INOMAX drives in plastic processing environments?
With proper maintenance, 20+ years. Plastic plants can be dusty (pellet dust, film fines) and hot. We recommend IP54 enclosures for extrusion lines and regular cleaning of air filters. Conformal coating (standard on all our drives) protects against humidity and airborne contaminants.
For Distributors & Partners (Commercial)
Q7: What is the minimum order quantity (MOQ) for distributors?
No strict MOQ for initial orders. Volume discounts apply from 10 units per order. For OEM/private label, MOQ is negotiated.
Q8: What is the standard warranty period?
2 years from date of manufacture or 12 months from commissioning, whichever comes first. Extended warranty up to 5 years available.
Q9: What is your typical lead time?
Popular models (≤250 kW) – 3-5 working days from our China factory + shipping. Larger units (250-6,000 kW) – 2-4 weeks.
Q10: Do you offer market protection?
Yes. Exclusive territory agreements (subject to minimum commitment) and project registration. Registered projects are protected – we will not quote directly or work with other distributors on that project.
Q11: Can you customize drives for my OEM requirements?
Yes: private labeling, custom parameter presets for specific plastic machinery models, special enclosures, modified firmware, custom voltage/frequency ranges.
Q12: What technical support can I expect for my customers?
Free pre-sales support: drive sizing, harmonic analysis, configuration recommendations. Post-sales: remote diagnostics (free), on-site commissioning (fee-based). Product training for your technical staff.
Q13: How does INOMAX compare to ABB, Siemens or Danfoss for plastic machinery?
We are legitimate competitors. Our ACS880 uses the same Direct Torque Control (DTC) technology as ABB ACS880. Performance specifications match or exceed competition. Price is 20-30% lower. Lead times are shorter. Customization is more flexible. Our winder and extruder macros are specifically designed for plastic applications.
Q14: Do you offer retrofit kits for converting existing plastic lines to variable speed?
Yes. We offer pre‑engineered retrofit packages including:
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Drive sized for your motor (extruder, winder, pump, fan)
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Pressure transducer (for hydraulic retrofits) or dancer/load cell (for winder retrofits)
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Pre‑configured parameters for your machine type
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Wiring diagram and installation guide
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Commissioning checklist
Contact us with your machine specifications for a quote.
Ready to Partner with INOMAX?
Join a growing network of distributors, retrofit specialists, and plastic machinery OEMs who have discovered that INOMAX delivers premium performance at a competitive price – with real factory support.
Apply for distributorship today:
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Fill out the form below with your company information and market focus
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We will contact you within 24 hours to discuss partnership terms
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Receive distributor pricing, marketing materials, and technical documentation
