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Plixus power calculator
1. Introduction
This application note explains how to use the Plixus power calculator
The Plixus power calculator is an important tool to determine :
- how much units can be connected per branch , depending on type of units , section of cables , length of cables
- what total max power of the installation will be
- Detect were potential problems of overcurrent or power loss may occur
2. Calculator overview no F/MM
In example below a screenshot of the calculator tool
The calculator tool allows calculation up to 8 NE/NEXT in one branch/loop to the Plixus AE/MME
If more branches of NE/NEXT are used , the calculation must be done for all the Plixus AE/MME branches
3. Calculator tool parameters
3.1. Legend
Each parameter has a specific color , which indicates its function
3.2. Amount of NE/NEXT
Enter the total amount of NE/NEXT in the branch/loop for which you want to enable the calculation
If all devices are connected directly to Plixus AE/MME, without NE/NEXT, then choose 1, then the 4 NE ports represent the 4 Plixus AE/MME ports
3.3. Cable section of 48V power supply to NE/NEXT
Select the cable section (drop down menu) and cable length from power cable to first NE/NEXT in the branch. And select each cable length to the following NE/NEXT (daisy chain connection)In below example , running power cable is 20 meters and connection from NE 1 to NE 2 is 1 m. power cable has a section of 1.5mm²
3.4. Branch name (optional)
Each branch name can be edited to enter cabling diagram reference for example
3.5. Start voltage
The calculated voltage at Port 1/2/3/4 of NE/NEXT
3.6. Device type selection
Via drop down menu device type selection can be made ; this will automatically result in another max power indication
Set the amount of units on this branch
If a mix of unit types is used , select the one with highest max power
3.7. Running datacable length and section
Enter the length of the running datacable (cable from NE/NEXT or AE/MME port to first unit in the branch). Select also the used cable section (AWG value) via the drop down menu .
The Ohm/m value will be automatically adapted depending on selected AWG value
3.8. Datacable length and section between units
Enter the average length of the datacable between devices in that branch . Select also the used cable section (AWG value) via the drop down menu .
The Ohm/m value will be automatically adapted depending on selected AWG value
3.9. Calculation
Press the calculate button to check the results
3.9.1. Result can not be calculated
If a result can not be calculated due to some settings that are very far out of accepatable limits , an “invalid” message appears for all branches
3.9.2. Result out can be calculated but result is out of specs
Non allowed end results are marked in red : check what parameters can be changed to obtain a better result (other cable section , less units per branch…)
Max current may not exceed 2A
Voltage at end of line may not be less the 36V
3.9.3. Results all within allowed limits
No red markings , so results acceptable
3.10. Total power use for all no F/MM devices
If total power is less then 400 W , internal power supply of Plixsu AE/MME is sufficient
If total power exceeds 400 W , external or additional power supply is needed
If total power exceeds 1000W or max current exceeds 16A , result is marked in red
16 A is max current limit that is allowed on the NE/NEXT power connectors
4. Calculator tool F/MM
4.1. Amount of used power branches
Set amount of power branches and optionally enter branch name
4.2. Device type and amount
Set type of F/MM and amount
4.3. Running power cable length and section
Enter length and wiresection of the power cable from power supply to first unit
4.4. Power cable between units
Enter length and wiresection of the power cable between F/MMs (power connection between F/MMs is done via daisy change
4.5. Calculate result
4.5.1. Result can not be calculated
If a result can not be calculated due to some settings that are very far out of accepatable limits , an “invalid” message appears for all branches
4.5.2. Result out can be calculated but result is out of specs
Non allowed end results are marked in red : check what parameters can be changed to obtain a better
result (other cable section , less units per branch…)
Max current may not exceed 16A
Voltage at end of line may not be less the 36V
4.5.3. Results all within allowed limits
No red markings , so results acceptable
4.6. Total power use for all F/MM devices
Total power indication will be marked red if max power exceeds 1000W or max current exceeds 21A
5. Total power use for all units
For total power requirement , calculate sum of result in 4.6 and 3.10
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