Extruder control cabinets
- Temperature control: 4–12 zones with independent PID, thermocouple input, solid-state relay (SSR) heating output
- Speed control: dual VFDs for main drive + feeder, speed ratio interlock (prevents stall on material starvation)
- Protection: die head overpressure alarm and shutdown, per-circuit heater overcurrent protection, thermocouple open-circuit detection
- Cooling: air cooling (per-zone fans) or water cooling (solenoid valves) with outputs configured per temperature zone
- Components: Schneider / ABB / Siemens / Chint; brand can be specified, or customer-supplied components shipped to our plant
Specifications
The table below covers 80% of factory distribution room cases. Anything outside it we can still build — those are engineered items, quoted separately, with an indicative price the same day.
| Type | Floor-standing; temperature control zone and power zone in separate compartments |
|---|---|
| Standard sizes (W×D×H) | 800×800×1800 / 1000×800×2000 mm, expandable with zone count, custom build available |
| Enclosure construction | 2.0 mm cold-rolled carbon steel; dedicated air duct for SSR heat sink |
| IP rating | IP54 standard (dusty workshop environment) |
| Operator panel | Per-zone temperature display / setpoint, main drive and feeder speed display, start/stop and emergency stop |
| Cooling | Forced-air duct for SSR heat sink + cabinet filter fan, internal temperature rise ≤15 K |
| Rated operating voltage | AC 380V / 400V power; AC 220V heating; DC 24V signals |
|---|---|
| Temperature Control Core | Temperature controller array (standalone, reliable) or PLC temperature control module (for interlocking / data logging) |
| Temperature Zone Configuration | 4–12 zones, each with independent PID + SSR output, type K / J thermocouples |
| Temperature Control Accuracy | ±1 °C (standard); down to ±0.5 °C with barrel cooling and process tuning |
| Cooling Output | Air cooling (zone fan on/off control) or water cooling (proportional / on-off solenoid valves) |
| Main Drive | VFD sized to main motor power, optional braking unit (for lifting duty) |
| Feed Drive | Independent small VFD, speed interlocked proportionally with the main drive, main drive stops after a feed interruption delay |
| Protection configuration | Die head pressure transmitter overpressure shutdown, per-circuit heater overcurrent, thermocouple break detection |
| Component brands | Schneider / ABB / Siemens / Chint; customer-supplied components accepted for factory installation |
| Economy Temperature Controller Type | Independent temperature controller per zone + relay logic interlocking, for small machines and retrofit of older machines |
|---|---|
| PLC Temperature Control Interlocked Type | PLC temperature control module + automatic heat-up curve on startup + temperature logging |
| Dual VFD Ratio Control Type | Main / feed ratio adjustment via HMI interface, feed interruption interlocking |
| Control Cabinet Retrofit Type | Reuse existing heaters and thermocouples, replace control cabinet and temperature control circuits |
| Machine Tool Electrical Control Cabinet | Spindle / servo / temperature control customized per machine model assessment (machine parameters required) |
| Assembly standard | GB/T 7251.1 / IEC 61439-1 |
|---|---|
| SSR Inspection | Heatsink contact and airflow path inspection, SSR selected at 1.5x rated current derating |
| Routine tests (every unit) | Insulation resistance, power-frequency withstand voltage, and powered simulation of thermocouple signals for zone-by-zone temperature control commissioning |
| Temperature rise | Cabinet internal temperature rise ≤15 K in SSR zones with forced-air cooling duct |
| Documents with shipment | Schematic diagram, temperature zone cross-reference table, parameter setting table, BOM, test report |
Five steps to specify your run
A configuration summary is generated as you go. It travels with your inquiry, saving a round of confirmation.
Build details
Systems have been in service for decades, and the failure points are always the same few: poor busbar contact, water ingress at the door seal, high temperature rise in the correction cabinet, and mis-phased outgoing feeders. The six hard rules below are written for exactly these points — every cabinet can be traced to them.
SSR not run at full load
Solid-state relays are sized at 1.5x the heater current with forced-air heatsink cooling. The SSR is the number-one failure point in a temperature control cabinet — we do not cut corners here.
Zone numbers match barrel sections
Every temperature control loop, terminal and display in the cabinet is numbered to match the barrel section. A cross-reference table ships with the unit, so changing a heater band requires no wire tracing.
You know immediately when a sensor fails
Open-thermocouple detection on every zone: displays a break alarm and cuts output to that zone, preventing runaway dry heating.
Feeder follows the main drive
Feeder speed is interlocked to the main drive ratio; when the main drive slows down, the feeder slows automatically. A material-starvation time delay shuts down the main drive to prevent dry screw wear.
Signals injected and verified one at a time
At the factory, a signal generator simulates temperature on each zone, and the heat-up / temperature hold / thermocouple break / overpressure logic is run through end to end.
Independent air duct for the SSR zone
The SSRs and heat sinks sit in a separate chamber with a dedicated forced-air duct, so heat never reaches the temperature controllers or the VFD zone. Temperature rise inside the cabinet stays ≤15 K.
Photos & enclosure construction
Below are photos taken in our own shop — from the complete unit down to the internal busbars and secondary wiring. Every build detail can be checked item by item.
Image key: 01–05 are shop photos (the numbers match the shot list). The line drawing shows the front elevation of the enclosure; dimensions match the specification table above.
Where these cabinets go
These are the routine applications — we can talk scheme and configuration directly. For the industry view, see the industry pages.
Plastic extrusion and pelletizing line
Multi-zone temperature control plus two-machine ratio control, supporting the pelletizing main drive.
Pipe and profile extrusion
Vacuum sizing and haul-off interlock, with cut-to-length signals tied in.
Film and fiber line
Multi-unit coordination and tension-related control configured to process requirements.
Rubber and plastic compounding equipment
Temperature control plus main drive speed control; cooling configured for water cooling.
Control cabinet retrofit for existing machines
Reuse existing heaters and thermocouples; replace the entire control section.
Machine tool and custom equipment electrical control
Spindle / servo / temperature control evaluated and built to machine model — just provide the parameters.
Commercial terms
Specification dated September 2026; quotations follow this.
| Drawings & design | Free |
| MOQ | 1 unit (5 or more recommended for production) |
| Production lead time | 15-25 days after drawing approval |
| on-time delivery | 98% |
| Warranty | 12 months |
| Loading port | Ningbo / Shanghai, China |
| Component brands | Schneider / ABB / Siemens / Chint |
| Factory visit & dispatch confirmation | Factory visits welcome; finished-cabinet photos and video before dispatch |
| Capacity | 5,800+ units / year |
Documents for your engineering team
Selection manual, outline dimensions and RFQ checklist — for the customer's electrical engineer. All three documents are being organized by product line; download links go live once complete.
Six questions procurement and electrical engineers ask most
Temperature controllers or PLC for temperature control?
If you only control temperature with simple logic, a temperature controller array is more reliable and cheaper — swap one module if it fails, no line stoppage. If you need automatic ramp-and-soak profiles, temperature logging, and integration with the whole machine, go with PLC temperature control modules. Many customers take the middle path: controllers handle temperature, the PLC handles interlocks — both sides stay solid.
Why do SSRs need such a large heat sink?
An SSR has a voltage drop when conducting, and all that power becomes heat. Poor heat dissipation is the number one failure source in temperature control cabinets. We size at 1.5× derating and add a forced-air duct, keeping the SSR baseplate temperature in the safe range and multiplying service life several times over.
How is material starvation detected?
Install a level switch or proximity switch at the feed inlet, or detect it from the feed current. After a starvation signal, a settable delay stops the main drive and raises an alarm, preventing the screw from running dry and scoring. The interlock sequence is written into the control logic.
How are feeding and the main drive synchronized?
Dual VFDs interlocked by ratio: feed speed = main drive speed × ratio factor, with the factor set on the panel or HMI. When the main drive speeds up or down, feeding follows automatically, and the interlock ensures the ratio never drifts.
What do you need to retrofit a control cabinet on an old extruder?
Number of temperature zones and heating power per zone, thermocouple type, main drive and feed motor power, and your existing operating habits (photos of the current cabinet face). Heaters and thermocouples can be reused — we configure circuits and settings around them.
Do you also build electrical control cabinets for machine tools?
Yes — electrical control for standard and special-purpose machine tools (spindle / servo / temperature control / cooling / lubrication interlocks). For high-precision multi-axis CNC, we recommend going to the machine builder for the matched package. Saying that may cost us an order, but it saves you from finger-pointing later.
Other cabinet types in the same main circuit
Related products use color-block placeholders for now (product photos not yet complete; they will be replaced together). Internal links will be filled in once live URLs are confirmed.
How this product is applied in the industry
Operating details, cabinet combinations and customization points are covered in the industry application page — go there directly.
Send us your barrel temperature zone diagram — we build the circuits to match
Send your temperature zone diagram or photos of the existing cabinet, and we'll provide a free temperature control and drive solution · quote within 24 hours. Direct from the source factory, MOQ 1 unit, 15–25 day delivery, 1-year warranty.
ISO 9001:2015 · CE(LVD+EMC) · CQC · IP65
When you write, include: single-line diagram or primary scheme, switch room layout, load list, and component brand requirements. You do not need complete drawings — capacity and cabinet type are enough to start.