Shilong Machinery Today’s Sharing: On-site Commissioning Checklist for Weighing Filling Machine

Weighing Filling Machine On-site Commissioning & Calibration Operation Checklist

Applicable: Bottom-weighing / Top-weighing Liquid, Paste & Slurry Filling Machines | For After-sales Commissioning and Customer Operator Training Manual

Pre-safety Reminder

For explosion-proof models, confirm the site complies with explosion-proof specifications. Perform mechanical inspections only after power cut. For sanitary models, complete equipment cleaning before commissioning

I. Pre-commissioning Inspection (Before Power-on)

1. Equipment Level: Adjust leveling feet and use a spirit level to calibrate the weighing platform to horizontal to avoid eccentric load errors.

2. Pipeline Inspection: Ensure no leakage on material hoses, valves and sealing rings. Align filling nozzles with bung openings without rubbing against bucket walls.

3. Air Supply / Power: Maintain stable air pressure (normally 0.4~0.6MPa) with no violent vibration of the air compressor; keep the conveyor running smoothly.

4. Sensor Protection: Verify weighing sensors are not subject to hard jacking or foreign object jamming, and no friction/interference exists on the weighing platform.

5. Material Preparation: Prepare filling materials and a set of standard weights covering the common filling range (e.g. 20kg filling machine matched with 20kg weights).

II. Power on, Weighing Indicator / PLC Basic Calibration (Weight Calibration, Operated by Qualified Personnel)

Purpose: Calibrate sensors and eliminate drift. This procedure is also required for annual metrological verification.

1. Empty Zero Calibration

Clear the weighing platform of buckets and materials; confirm no contact with surrounding supports.

Enter the indicator calibration menu, execute Zero Calibration and save the zero point.

2. Span Calibration

Place standard weights at the center of the weighing platform.

Input the actual weight value of weights in the menu, execute span calibration and save parameters.

Remove weights and confirm reading returns to zero. Repeat twice for verification; qualified only if reading error is minimal.

3. Tare Function Test: Place empty bucket on weighing platform, press tare key; indicator shall display net weight 0.

III. Filling Formula Parameter Setting (Touchscreen Operation, Adjustable by Operators Daily)

Enter formula page, create / recall product formula and set core parameters:

1. Target Net Weight: Finished filling weight required by customer

2. Fast & Slow Fill Switchover Weight (2-stage / 3-stage Filling)

Fast fill: Rapid feeding until reaching switchover value → auto switch to slow fill

Slow fill: Fine feeding at low flow rate to improve accuracy

Commissioning Tip: Larger switchover value means longer slow fill time, higher accuracy but lower production capacity.

3. Drop Compensation (Pre-closure for in-air material)【Critical Parameter】

After valve closure, residual material in pipeline still drips into bucket, known as in-air material.

Finished product overweight: Increase pre-closure value to close valve earlier

Finished product underweight: Reduce pre-closure value to delay valve closure

4. Stabilization Filtering

Heavy workshop vibration: Increase filtering for stable weight reading (slower response)

Stable environment: Reduce filtering for faster filling response

5. Delay Parameters: Material drop delay, valve closing delay, weighing stabilization waiting time (extend stabilization time properly for high-foam materials)

IV. Trial Filling & Fine-tuning Process

1. Place empty bucket on weighing platform, tare, start single trial filling.

2. After filling completes, take out bucket and recheck actual net weight with external reference scale.

3. Run continuous trial filling for 5~10 buckets and record weight of each bucket to observe fluctuation.

- Consistent overweight / underweight for all buckets → adjust Drop Compensation

- Large fluctuation between buckets (alternating high and low): Prioritize troubleshooting vibration, uneven bucket bottom and material foaming; secondly extend weighing stabilization time.

- Higher accuracy requirement: Lengthen slow fill segment; higher output requirement: Shorten slow fill segment.

4. Save formula with ID and name after acceptance (e.g. 20kg Lubricating Oil, 5L Coating), support one-click recall.

V. Acceptance Criteria

1. Sampling of 10 consecutive buckets, weight deviation meets customer requirements and JJG 687 prepackaged goods specification.

2. No dripping or splashing; nozzle suck-back function works normally (enable suck-back for high-viscosity / drip-prone materials).

3. Stable weighing reading without jumping values.

VI. Daily Maintenance & Periodic Calibration (Handed over to Customer Operators)

- Per shift: Clean weighing platform to remove residual materials and debris; check weighing platform for jamming and perform zero reset on startup.

- Weekly: Inspect sensor cables and connectors to prevent pulling and water ingress; recheck weight of 2~3 buckets.

- Every 3~6 months: Re-perform zero and span calibration using standard weights.

- Annual Metrological Verification: Conduct inspection in accordance with requirements of local metrology authority.

VII. Quick Troubleshooting for Common Faults

1. Unstable weight with jumping readings

Check: Weighing platform rubbing frame, ground vibration, air hose / material hose pulling sensor, air flow interference.

2. Consistent overweight for every bucket

Reduce pre-closure value / Drop Compensation

3. Consistent underweight for every bucket

Increase pre-closure value / Drop Compensation

4. Weight keeps rising after slow fill target reached → nozzle dripping; enable suck-back or clean valve sealing parts.

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Guangzhou Shilong Machinery Equipment Co., Ltd.

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