== Usage == Pressure Sensor with 2 free configurable DO points and one 4-20mA analog Output.
Is used for the pressure setpoint start/stop Chain tension Hydraulic Pump
1 Hardware Connection[edit | edit source]
2 Parameter Settings[edit | edit source]
| Parameter | Function | Setting |
| SP1 | Upper limit for system pressure at which Output switches with hysteresis setting. | |
| rSP1 | lower limit for system pressure at which Output switches with hysteresis setting. | |
| DO (Out1) | Hno=Normally open, Hnc= Normally closed | |
| I (Out2) | Analog Output . 4-20 mA =0-100 bar | 4-20mA |
| From | Min.Value | 0.0 |
| To | Max.Value | 100.0 |
Note: * = ===Get SP1 and rSP1=== Formula
rSP1 = Basic pressure [bar] x Speedfactor_min - 3 bar SP1 = Basic pressure [bar] - 5 bar
Speedfactor_min: Depending on the chain speed we have different speed factors. You can get these factors from the mechanics on site or from the software (e.g. FACSPDLOW = 0.75, FACSPDMID = 0.65, FACSPDHIG = 0.55). The factors differ from line to line because they depent on the chain characteristics. Choose the lowest value from the different speed factors.
Explanation
The chain tension depends on the chain length and the chain speed.
- Basic pressure [bar] = pressure factor [bar/m] x chainlength [m] + 35 [bar]
- Final [bar] = Basic pressure [bar] x Speedfactor
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Mechanics diagramm of hydraulic pressure over the chain lenght
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Mechanics diagramm of hydraulic pressure exactly
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Mechanics alarm settings
First, we calculate the basic pressure depending on the chain length and the chain type. For this calculation we need the pressure factor. The pressure factor is depending on the chain type and says, how much pressure is required per meter of chain. The result of this calculation can be found in the Chain Tension panel (see below).
Then we calculate the final chain tension by multiplying the basic pressure with a speed factor. The faster the chain runs, the less tension is required.
