Milacron Elektron 400/500/600 Full Electric Injection Molding Machine On site Maintenance and Troubleshooting Complete Guide

Milacron Elektron 400/500/600 Full Electric Injection Molding Machine On site Maintenance and Troubleshooting Complete Guide

Since Milacron introduced all electric injection molding technology in 1985, the Elektron series has become a benchmark for high-precision injection molding in the medical, automotive, consumer goods, and construction industries. Compared to traditional hydraulic presses, the Elektron series can save 60% energy and 90% water, and has no risk of hydraulic oil leakage, making it suitable for clean room operation. This series offers three models: 400, 500, and 600, with locking forces ranging from 970 kN to 4550 kN. The modular design of the injection unit allows for flexible matching of different product requirements.

However, any high-precision equipment will face problems such as mechanical wear, electrical aging, and parameter drift during long-term operation. When Elektron experiences unstable injection, abnormal locking force, touch screen crashes, or alarms that cannot be cleared, on-site engineers need to quickly locate the root cause and restore production. This article is based on official technical information from Milacron, combined with years of on-site service experience, to provide a detailed breakdown of the maintenance points, troubleshooting process, and replacement solutions for discontinued spare parts for Elektron 400/500/600.

Chapter 1 Overview of Core Technology Architecture

1.1 Advantages of fully electric vehicles

The Elektron series completely abandons hydraulic oil and all actions are driven by high-precision servo motors:

Energy saving: Compared to hydraulic presses, energy consumption is reduced by 60%; No need for hydraulic oil cooling, reducing water consumption by 90%.

Dynamic: All axes (locking, injection, ejection, plasticization) can achieve fully parallel motion, with no additional options required for standard configuration.

Precision: The injection pressure can reach up to 33350 psi (2300 bar), and the load sensor directly monitors the melt pressure, with repeatability far exceeding that of hydraulic systems.

Cleanliness: There is no risk of oil leakage, oil mist, or slipping due to oil stains, and it can be directly installed in an ISO 7 cleanroom.

1.2 Model and Framework

Model Frame Options Locking Force Range Typical Injection Unit

400 970/1540/2290 kN 970-2290 kN Maximum injection volume 22.8 oz (646 g)

500 1540/2290/3470 kN, injection volume of 1540-3470 kN, maximum 76.9 oz (2179 g)

600 2290/3470/4550 kN 2290-4550 kN Maximum injection volume 105 oz (3142 g)

Each injection unit model offers three screw diameter options: A/B/C (e.g. 400 type: 45/50/60 mm), with an L/D ratio of 20-28 and a maximum screw speed of 350 rpm.

Chapter 2: In Depth Analysis of Endura Touch Control System

2.1 Hardware and Interface

Elektron comes standard with a B&R high-performance controller and a 15 inch color touchscreen. 32 physical function keys with LED backlighting are arranged around the screen, supporting quick access to commonly used pages. The design concept is' no more than two clicks on any page '.

External interface:

3 USB ports (supporting exporting mold data, screenshots, and alarm records from USB drives)

RS232 (connect to printer or barcode scanner)

Ethernet (for remote monitoring or MES connection)

2.2 Key monitoring functions

Process monitoring: Display the minimum/maximum/average values of 33 parameters (injection peak pressure, plasticizing time, locking force, etc.) from the last 150 cycles in graphical form.

Alarm History: Stores the last 3000 alarms with dates and timestamps.

Change log: Record the last 3000 set value modifications for easy traceability of process adjustment responsibilities.

Internal storage: up to 80 sets of mold parameters.

Access permission: Level 4 security level, supporting up to 100 operators.

I/O expansion: 3 freely configurable inputs+3 freely configurable outputs (expandable).

2.3 Common HMI Malfunctions and Troubleshooting

Phenomenon 1: Touch screen has no response or slow response

Possible reasons: Oil stains/static electricity accumulation on the surface of the capacitive screen; System memory overload (long-term uncleaned cache).

Solution: Wipe the screen with a soft damp cloth (non corrosive cleaner); Execute 'memory optimization' through the Service menu. If it still doesn't work, check if the wiring of the touch control board on the back is loose.

Phenomenon 2: Alarm history shows a large amount of "servo following error"

Reason: Powerlink real-time communication interruption or servo drive overload.

Troubleshooting: Check the axis corresponding to the alarm (such as the injection axis) and measure the temperature of the servo motor; Check if the shielding of the motor power line and encoder feedback line is good; Observe whether the current waveform is smooth through the "Driver Diagnosis" page of Endura Touch.

Phenomenon 3: The USB drive cannot recognize or fails to save

Reason: Insufficient power supply to the USB interface or incompatible file system (Elektron only supports FAT32 format).

Processing: Use a FAT32 formatted USB flash drive with a capacity of ≤ 32GB; Avoid using USB extension cords; Try the rear USB port (more stable than the front port).

Chapter 3 Maintenance and Troubleshooting of Locking Mechanism

3.1 Structural Features

Elektron adopts a double toggle locking mechanism, which is driven by a high-precision servo motor to open and close the mold using ball screws and synchronous belts. The mobile template is equipped with high-precision linear guides, which can maintain the parallelism of the template even under heavy load and high-speed operation. The locking force is automatically set through software (the tonnage is inputted on the screen, and the system automatically adjusts the clamping position).

3.2 Common faults and their solutions

Fault A: The actual locking force is much lower than the set value, causing the product to flash

Possible reasons:

The thickness of the mold changes or the parallelism of the template exceeds the tolerance.

The wear of ball screws leads to a decrease in transmission efficiency.

The synchronous belt is not tensioned enough.

Troubleshooting steps:

Use the 'Lock Force Calibration' function of Endura Touch to automatically execute the semi closed mold calibration program.

Use a dial gauge to check if the elongation of the four pull rods is consistent (a difference of>0.1mm indicates template tilt).

Check the synchronous belt: Open the rear cover, press the center of the synchronous belt, and the deflection should be 10-15mm (apply a force of about 50N using a spring scale). If it is too loose, adjust the tensioner.

Listen for any abnormal noise from the ball screw - if so, disassemble and inspect the screw raceway and nut.

Fault B: The stop position of the mold opening and closing is unstable (with a difference of>0.5mm each time)

Reason: Interference from servo motor encoder or loss of pulse counting; The mechanical clearance is too large.

handle:

Check if the encoder cable is routed separately from the power line (with a minimum spacing of 200mm).

Execute the 'zero reference point recalibration' procedure: manually move the template to the mechanical hard limit and reset the origin point according to the on-screen instructions.

If it still drifts, measure the clearance between the sliding guide rails: move the template to the middle position, use a pry bar to pry the end face of the template, and if the displacement sensor reading exceeds 0.2mm, replace the guide rail slider.

Fault C: Frequent false triggering of mold protection (low voltage and low speed section alarm)

Reason: The mold protection pressure threshold is set too low; Abnormal resistance caused by foreign objects or poor lubrication in the guide rail.

Adjustment:

On the "mold clamping settings" page, enter "two-stage mold protection" and increase the low-pressure protection pressure limit appropriately (usually 5-8% of the locking force).

Enable the 'try again function' - if the protection is triggered for the first time, the system will automatically reverse and attempt to close the mold again to avoid unnecessary downtime.

3.3 Maintenance of Automatic Lubrication System

The Elektron locking mechanism adopts an automatic central grease system, which automatically injects grease every 1000 cycles or every 2 hours. Maintenance points:

Check the oil level of the grease tank monthly (using Kl ü ber Isoflex NBU 15 or equivalent).

Clean the distribution block filter every 6 months.

If there is no grease discharge from a certain lubrication point (such as the moving template guide rail), it may be due to a blocked distribution valve, which needs to be cleared with a fine wire and manually greased.

Chapter 4 Precise Adjustment and Fault Diagnosis of Injection Unit

4.1 Composition of Injection System

The injection shaft is driven by a servo motor to push the ball screw forward; The plasticizing shaft is driven by an independent motor to rotate the screw. Both can operate in parallel in the same loop, reducing cycle time. The injection pressure is directly measured by a high-precision load cell at the rear of the screw, which measures the melt pressure and feeds it back to the closed-loop control system.

4.2 Common Injection Malfunctions

Problem 1: The actual injection pressure deviates significantly from the set value (exceeding ± 5%)

Reason: Zero drift of load sensor or poor contact of signal line.

handle:

Execute 'Zero Pressure Calibration' in the 'Injection Calibration' menu (separate the nozzle from the mold to ensure no back pressure).

Check if the load sensor cable plug is loose (usually located at the rear of the injection unit). If the calibration is still inaccurate, the sensor (usually HBM or Kistler model) needs to be replaced.

Attention: After replacing the sensor, it must be recalibrated and old parameters cannot be directly used.

Problem 2: Unstable injection speed, especially during short shots

Possible reasons:

Synchronous belt wear or insufficient tension (injection shaft drive belt).

Wear of the screw check ring (causing melt reflux).

The servo drive parameters (speed loop PID) need to be optimized.

Troubleshooting process:

Perform a 'semi-automatic injection' test and observe the injection speed curve. If there are periodic fluctuations on the curve, it may be damage to the screw raceway.

Air injection test: Turn off the heater, manually retract the screw to the bottom, and then quickly inject. Measure the injection length and compare it with the set stroke; If the actual injection volume is less than 90% of the set value, it indicates that the check ring is leaking. Replace the check ring (remove the screw).

Check the tension of the synchronous belt: Same as the method in Chapter 3, but the tension of the injection shaft synchronous belt should be higher (deflection 6-10mm).

Problem 3: Unstable plasticization and large fluctuations in the material cushion (>2mm)

Reason: Poor back pressure control; Plasticized servo motor speed fluctuation; Differences in raw material batches.

handle:

Check if the back pressure setting value is too small (recommended ≥ 5 bar).

Check if the "actual screw speed" in Endura Touch matches the set speed. If the difference is greater than 10 rpm, it may be due to interference from the motor encoder signal.

Clean the feed inlet to prevent bridging.

4.3 Cleaning and maintenance of injection unit

The Elektron injection unit adopts frictionless linear bearing guidance, which does not require grease lubrication and avoids contaminating the product. However, it should be noted that:

Check the material dropping area for debris every month;

Remove the screw and check the wear of the surface coating every 2000 hours of operation;

When replacing the heating belt, it is necessary to use the original specifications (voltage, power, aperture), wrap it with insulation cotton and tie it tightly after installation.

Chapter 5: Driver System and Powerlink Network

5.1 Driver Architecture

All motion axes (locking, injection, plasticization, ejection) use high-precision servo motors, which communicate with PLC through Powerlink real-time Ethernet protocol, with a cycle period of ≤ 1ms. The closed-loop control includes three loops: position, speed, and pressure (through load sensors).

5.2 Common Driver Alarm and Handling

Steps for troubleshooting the meaning of alarm codes

E-5001 injection shaft overload check for mechanical jamming (whether the manual rotation of the screw is smooth); Measure the resistance of the three-phase winding of the motor; Reduce the injection speed setting value

Check if the synchronous belt is broken due to excessive tracking error of the E-5002 locking axis; Is the encoder feedback line damaged; Restart the controller and recalibrate the zero position

E-5003 Powerlink communication timeout check for network cables and switches (if there are multiple machines); Restart all drive power sources; Check if the terminal resistance matches

E-5004 ejection shaft position exceeds the limit, manual reset ejection; Check the limit switch signal; Re calibrate the zero point of the ejection stroke

5.3 Precautions for Replacing Servo Motors (Similar to Woodward Module Replacement)

When the servo motor is damaged and the original model (such as the B&R ACOPOS series) has been discontinued, follow the steps below to find a replacement:

Record the original motor nameplate parameters: rated torque, rated speed, encoder type (Resolver or EnDat), and brake voltage.

Confirm compatibility with alternative models with Milacron's original factory, or contact a third-party servo repair provider for refurbishment.

After replacing the motor, the "Motor Automatic Recognition" program must be executed: enter "Motor Parameter Automatic Setting" in the "Drive Settings" of Endura Touch, run for about 2 minutes, and the system will automatically match the current loop parameters.

Perform zero calibration and gain optimization for all relevant axes again (speed loop, position loop).

Chapter 6 Temperature Control System and Heating Fault Handling

6.1 Temperature Control Characteristics

Elektron comes standard with 4-stage drum heating and 1-stage nozzle heating (4/1 for 400/500/600 models). Equipped with automatic detection of heating strip failure and thermocouple open circuit, and a heat standby mode - set to automatically reduce the temperature of each section after several cycles of no production, saving energy consumption; Cool start protection (Soak Timer) - Injection is prohibited before the barrel temperature reaches the set value.

6.2 Common Heating Malfunctions

Fault 1: A certain temperature cannot rise to the set value, displaying "Heater and Failure"

Possible reasons:

The heating belt has an internal open circuit.

Solid state relay (SSR) is damaged or the triggering signal is lost.

Poor installation of thermocouple position.

diagnosis:

Measure the current of the heating strip in this section using a clamp ammeter (normally similar to other sections). If there is no current, check the power contactor and SSR.

Measure the resistance of the heating strip (disconnect the power supply): for example, the resistance of a 400W/230V heating strip is about 132 Ω. If it is infinite, replace the heating belt.

Thermocouple measurement: Use a multimeter in mV range to measure the two ends of the thermocouple and compare it with the calibration table. If there should be 0mV at room temperature but a significant deviation is displayed, replace the thermocouple.

Fault 2: Severe temperature fluctuations (above ± 10 ℃)

Reason: Improper PID parameters; The power of the heating belt is too high; The thermocouple insertion depth is insufficient.

handle:

Enter the advanced temperature control menu, execute "PID adaptive", and let the system automatically tune.

Check if the thermocouple tip is in contact with the metal casing of the heating strip (which may cause ground circuit interference).

Ensure that the heating belt fastening strap is not loose and that the heat conduction is good.

6.3 Heating Belt Replacement Guide

When the original heating belt is discontinued, it is necessary to choose a substitute with the same or slightly smaller size, voltage, and power (the power cannot exceed 15% of the original value, otherwise it may burn out the SSR). During installation:

Clean the surface of the material cylinder and apply thermal conductive silicone grease.

The heating belt joint should face downwards or sideways to avoid liquid dripping in.

After re tightening, use an infrared thermal imaging device to check the surface temperature uniformity.

Chapter 7: Top out System and Automation Interface

7.1 Top out design

Elektron adopts central ejection (SPI ejection hole standard), driven by servo motors for ball screws and synchronous belts. The ejection speed, force, and ejection times can all be set on the screen. The maximum ejection stroke is 150 mm (depending on the model).

7.2 Common Problems

Squeezing or crawling:

Check the tension of the synchronous belt (as before).

Apply special lubricating grease (Kl ü berplex GE 11-462) to the ejector screw.

If the guide copper sleeve of the ejector plate is worn, it needs to be replaced (can be ordered from Milacron).

Improper ejection or excessive travel:

Re calibrate the ejection zero point: manually retract the ejection plate to the mechanical stop position and press the "zero point setting".

Check the encoder connection.

Attention: Exceeding the stroke may damage the mold ejector pin plate, so be careful.

Chapter 8 Preventive Maintenance Plan

Based on the design characteristics of Elektron, the following maintenance cycle is recommended:

Periodic maintenance project notes

Clean the feeding area daily, check the heating strip indicator light, observe the oil level in the grease tank, and use a non-metallic scraper

Clean the fan filter (electrical control cabinet) weekly, check for visible cracks on the synchronous belt, and maintain positive pressure in the electrical control cabinet

Check the tightening marks of each axis bolt (injection seat, locking rod nut) and torque according to the instruction manual every month

Clean the servo motor cooling fan quarterly and measure the insulation resistance (≥ 10M Ω) with a 500V megohmmeter to ground

Replace the lubricating grease distributor filter element every six months, check the Powerlink network cable crystal head, and use original spare parts

Annual recalibration of locking force and zero point calibration of injection load sensors require specialized weights or pressure sensors

Check the wear of the screw and check ring every 2000 hours, and replace the synchronous belt according to the actual situation, which can be extended to 4000 hours

Chapter 9: Replacement Strategy for Discontinued Spare Parts

Some early models of spare parts in the Elektron series, such as B&R PLC modules, specific model servo drives, and older touch screens, may have been discontinued. The following are practical and feasible replacement options:

9.1 Control system spare parts

Touch screen: The original 15 inch B&R Power Panel PP420 or PP450 has been EOL and can be upgraded to the PP700 or PP800 series, but the operating system image and HMI project files need to be updated. Suggest contacting Milacron to obtain the migration toolkit.

I/O modules: X20 series modules are still in mass production and have good compatibility. If the original 16 input module is damaged, it can be replaced with X20DI9371 (with slight wiring changes required).

Powerlink network card: It is recommended to replace it with the latest POWERLINK V2.0 compatible card and match it with the drive firmware.

9.2 Servo motors and drivers

If the original motor model (such as B&R 8LSA or 8LVA) is discontinued, the B&R 8LSE series can be used as a replacement, but it should be noted that:

Flange size and inertia matching.

The encoder type must be consistent (e.g. both are EnDat 2.1).

After replacement, the motor automatic recognition program and gain optimization must be executed.

9.3 Mechanical spare parts

Ball screw: supplied by Rexroth, THK or NSK. Users can measure the diameter, lead, and end machining dimensions of the original screw and place orders with professional screw manufacturers without relying on Milacron's original factory.

Synchronous belt: The brands are mostly ContiTech or Optibelt. You can purchase them separately by reading the surface model of the belt (such as AT10-810-25).

Linear guide rail: usually HIWIN or THK, purchase standard parts after measuring the slider size.

Key reminder: After installing all replacement mechanical parts, it is necessary to perform mechanical zero calibration and software limit settings for each axis again, otherwise collisions may occur.

Chapter 10 Cycle Time Optimization Techniques

The parallel motion ability of Elektron is the core of improving production. The following are practical optimization methods on site:

Overlapping plasticization and mold opening: Start plasticization (screw rotation) at the same time as the mold is opened. Set the "advance plasticization" time to start at 70% of the mold opening stroke.

Parallel ejection and retrieval: The ejection and retraction can overlap with the entry of the robotic arm. Set the "ejection delay" parameter to 0 and trigger the robotic arm using auxiliary output.

Optimization of injection pressure switching point: By observing the "injection pressure curve" of Endura Touch, setting the V/P switching point at a position just after the pressure exceeds the peak can reduce flash and shorten filling time.

Mold protection speed segmentation: Low speed and low pressure are used for the last 20mm of mold closing, and the previous medium and high speeds can be appropriately increased (as long as the mold does not collide).

Quick mold change: Elektron's automatic locking force setting can be completed with just one click by calling the mold data. Combined with 5-minute rapid mold change card (SMED), it can significantly improve the efficiency of small-scale production.