VFFS Power Consumption: Ratings, Supply Requirements and Missing Measurements

A VFFS electrical rating and a production-energy result answer different purchasing questions. The supply specification identifies the voltage, phase arrangement, frequency and current requirements for the selected equipment. Connected power describes the stated load boundary. Measured kilowatt-hours describe energy used during a timed operating interval. Keep these quantities in separate quotation fields before estimating utilities or operating cost.

The U.S. Energy Information Administration distinguishes power in watts or kilowatts from energy accumulated over time in watt-hours or kilowatt-hours. Apply that distinction to the packaging cell: copy the quoted ratings into the supply schedule, then use a meter record with the same defined equipment boundary and operating period for the energy comparison.

Start the review by listing the base bagger, dosing equipment and auxiliaries. Identify which items share the main supply and which require separate connections. The worksheet below provides fields for both quoted electrical requirements and a timed energy record, so facilities engineering and production can review the appropriate inputs together.

Classify each figure on the quotation before comparing machines. A connected real-power rating in kW describes the active load assigned to the stated equipment boundary. Ask whether the number is installed capacity, a maximum demand or a value for a particular operating state. An apparent-power rating in kVA describes a different electrical quantity. The EIA defines power factor as real power divided by apparent power for a given load and time; retain the stated units and obtain the relevant load information before relating the two.

Supply entries for voltage, phase, frequency and current identify the connection requirements to review against the site's available supply. Ask qualified facilities personnel to review the electrical drawing, nameplate, connection points and protection requirements together. A current value alone does not establish average production energy or whether separate dosing and inspection equipment is included.

Use cumulative meter readings for operating energy. Multiplying an installed kW rating by a full shift assumes that load remains constant for the entire period. Heater cycling, intermittent motion and standby periods can change actual draw during the run. If the quotation contains an option range or a supply-only entry, request the selected configuration and load condition in writing, then keep the energy measurement in its own field.

A vertical bagger can operate with an elevator, weigher or auger filler, coder, discharge conveyor and inspection equipment. List each powered assembly and its supply point before adding loads or comparing energy records. The quoted base-machine boundary may differ from the complete packaging-cell boundary required for the project.

Use one row per assembly in the electrical scope sheet. Identify any device fed through the main bagger disconnect and each device requiring its own supply. Retain the voltage, phase and frequency for each connection instead of combining unlike supply requirements into one headline number. Ask the supplier to identify the scope of any total stated on the quotation and have the site electrical team review the resulting schedule.

Record compressed air separately. Pneumatic jaws, tuckers, clamps or knife actuators use energy supplied through the plant air system. A servo option can change both the cabinet electrical load and the pneumatic demand. Compare its quoted electrical and air requirements in their own units, with their operating conditions. If plant energy cost is part of the decision, assign the compressor and distribution boundary explicitly and obtain the corresponding measured or allocated energy basis.

The bagger's electrical loads can include sealing heaters, film-pull and unwind drives, dosing equipment and control components. During a cold start, the sealing assembly must reach its operating setpoints. During production, the temperature control supplies heat as required by the film and surrounding conditions. Drives also follow the machine's motion and dosing sequence. Retain the operating state with the energy reading so a warm-up result stays distinguishable from steady production.

Film construction, sealing settings, bag geometry and output can affect the thermal and motion duty. Record those inputs when comparing runs on the same equipment. A material change may need a different sealing window or motion setting, so assess its finished-pack quality and energy result under the selected conditions. Keep any stop, refill or reel splice in the event record; energy used during a hot pause still belongs to the period even when no accepted bags leave the machine.

For an operating-cost comparison, separate cold-start warm-up, steady production and hot standby or changeover. Record start and stop readings for each interval. Then choose a combined boundary that represents the plant's expected schedule, retaining the included time and accepted-pack count. This makes a short continuous run distinguishable from a shift containing the planned interruptions.

Before signing a purchase order or scheduling a factory acceptance test, copy the blank line-boundary electrical scope sheet and trial energy log below. Download the CSV file to keep one row per powered assembly—base VFFS bagger, dosing machine, infeed elevator, date coder, discharge conveyor and inspection unit—and record whether each device feeds from the main bagger cabinet or requires its own customer-supplied drop.

In the rating columns, enter only what the supplier's quotation or electrical schematic explicitly states: voltage, phase count, frequency, full-load or maximum current (A), connected real power (kW), or apparent power (kVA). If a supplier provides kVA without kW, or prints a voltage and amperage string without a power rating, write Not stated in the missing column rather than calculating a substitute number. Cross-reference the confirmed connection points with the facility readiness owner on the site utilities checklist.

If energy per hour or energy per 1,000 accepted packs is a commercial decision criterion for your project, ask whether the supplier can log cumulative kWh with a calibrated three-phase power analyzer or cabinet energy meter during a witnessed trial on your actual film and product. Record the meter connection point, start and stop timestamps, elapsed minutes, total accepted bags, film structure, vertical and horizontal seal setpoints, and measured kWh for each run stage. Where no metered run has been performed, leave the kWh columns blank and treat operating electricity cost as an unverified variable in your quotation comparison.

Calculate average active power from a measured interval as average kW = recorded energy change in kWh ÷ elapsed hours. Calculate energy per 1,000 accepted packs as recorded kWh × 1,000 ÷ accepted-pack count. Both calculations require the meter and output count to cover the same equipment and time boundary. Keep startup rejects and paused periods identified according to the agreed counting rule.

For an illustrative run, assume the meter records 12 kWh over four hours while the defined line produces 12,000 accepted packs. Average draw is 12 ÷ 4 = 3 kW, and energy per 1,000 accepted packs is 12 × 1,000 ÷ 12,000 = 1 kWh. Multiply the included kWh by the applicable energy tariff for the energy-charge component of cost, and account for demand charges or other tariff items separately where they apply.

Retain opening and closing readings, elapsed time, accepted count, film, dose and sealing settings with the result. Compare only runs with equivalent scope and explain any changed product or pack condition. Use the selected machine's electrical drawing and nameplate for the supply review, while using the timed readings for the operating-energy calculation.

Electrical inspection and meter installation belong with qualified personnel following the site's isolation and electrical-safety procedures. In U.S. workplaces, OSHA 29 CFR 1910.333 addresses deenergizing exposed parts and restricts work on equipment that remains energized to qualified persons with suitable precautions. Apply the governing local requirements to the actual measurement task.

Four catalog pages from three manufacturers supply the nine fields in the sheet below. Keep kilowatts, kilovolt-amperes, and the voltage, phase and frequency wording in separate columns. The last column asks for a measured line-energy record for that same model and equipment boundary.

Fields 1 to 3 come from the BAOPACK CB-VG42A cell, fields 4 and 5 from the Hualian HLNV-680 cell, fields 6 to 8 from the Viking Masek M250 cell, and field 9 from the Viking Masek M500 cell. These lines are those manufacturers' catalog text for the named models. For operating cost, ask the supplier for a measured kWh record at a stated meter point, with the product, fill quantity, bag type, film and accepted-pack count on the same log. Enter that record in the trial sheet above. The measured-energy column stays a request until that record is in the file.