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Will FourJaw Energy Monitoring work on all my machines?
The short answer is yes.
Current Range
The current clamps we use work on any machine where each phase has a current draw from 50mA-100A. However, we do have 200A clamps available, please get in touch at support@fourjaw.com if this is required.
3-phase or 1-Phase
If your machine uses 3-phase electricity, simply clamp around one phase of the main incoming supply and make sure the machine has 3-phase chosen in Energy Settings. If 1-phase, clamp around the one cable and choose 1-phase in settings.
Age, Make and Model
The age, make or model of the machine doesn’t impact the efficacy of the FourJaw platform.
Exceptions
For energy monitoring to be accurate, there needs to be one clamp around a phase of the main incoming cable. If this isn't the case, total machine energy consumption might not be recorded. To discuss in more detail, contact support@fourjaw.com
How accurate is FourJaw Energy Monitoring?
Energy Monitoring is indicative rather than a precise measurement.
The accuracy of the energy use values will depend on the accuracy of the power factor of your machines and the accuracy of the current clamp measurement.
We have had our current clamps independently tested and in the range of 1 - 100 Amps, the accuracy is +/- 5.5%.
Energy monitoring in this way, however, is accurate enough to show you trends and anomalies.
For applications requiring more accurate data on energy monitoring, you can scale the energy use stated by FourJaw to that given by an accurately calibrated ammeter by changing the power factor of the machine.
What calculations are used in FourJaw Energy Monitoring?
FourJaw's energy monitoring feature is useful to enable you to identify trends, and problem areas and see if interventions are having an effect.
How do you calculate power usage?
Single Phase
P = pf × I × V / 1000
In this formula, the amount of power - P (in kW) is equal to the power factor of the load (pf) multiplied by the phase current measured in Amps (A), multiplied by the voltage between the phase and neutral (V), and divided by 1000.
3 Phase
P (kW)= √3 × pf × I × V /1000
The power - P (in kW) equals the square root of three (√3) multiplied by the power factor (pf) multiplied by the current in Amps (A), multiplied by the Phase voltage (V) divided by 1000.
How do you calculate the cost?
We multiply the power used by the cost per kWh given on the settings page.
How do you calculate the carbon footprint?
We multiply the power used by the kilograms of carbon equivalent per kWh given on the settings page. This is defaulted to the UK government-approved value.
How do you calculate the Energy Efficiency Metric?
We divide the number of uptime hours by the energy consumed. This gives a value that indicates how much energy was used to manufacture product rather than on downtime, with higher values being more efficient.