T+R LA66

1 General

Absolute linear encoder LA/LP/LMP with PROFIBUS-DP interface Hardware Settings is step by step replaced by a similar sensor using ProfiNet.

2 Hardware settings

2.1 PROFIBUS Shield

Recheck that the PROFIBUS shielding is connected proper.

If the measuring System is the last slave in the PROFIBUS segment, the bus is to be terminated withthe termination switch = ON. In this state, the subsequent PROFIBUS is decoupled.

2.2 Bus Address

Valid PROFIBUS addresses: 3 - 99
10⁰: Setting the 1st position
10¹: Setting the 10th position
The device does not start up with an invalid station address, LEDs = OFF.

2.3 LED Diagnostic

The measuring system has two LEDs in the connection hood. A red LED (Bus Fail) to display faults and a green LED (Bus Run) to display status information. When the measuring system starts up, both LEDs flash briefly. The display then depends on the operational state.

3 Bolt Lubrication

3.1 Hardware configuration

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Important: If the Properties in the Hardware Configuration are not correct, the Sensor will show Bus Fault anytime.

3.2 Communication and Calibration

3.2.1 Adjust the PVSS2 Level Sensor Parameters

Parameter Calculation Sheet

3.2.2 Calibrate the actual Position

Zero Setting of the Level Sensor:

By determination together with EMT it was decided that the red line in the gage glass equals ZERO. Zero setting of the level sensor is done when the mechanic has filled the tank up to the red line. A few millimeters more or less does not matter. But in fact there are some liters inside when the red line is reached. We use the red line for zero setting to avoid sucking air.

Before doing the calibration, check if the distance sleeve is mounted. Therefore you have to take out the Sensor from the Tank. Move the float lever to the very end of the measuring stick and press calibrate.

Attention:
If the red light is flashing at an empty tank, maybe the float lever is out of the range of the measuring stick. Check the distance sleeve position.
If the red light is permanent on, maybe the float lever is plugged in the wrong direction to the measuring stick. Turn it around.

3.2.3 Function Test

Move the sleeve to the upper position and check the reading in PVSSII and check if it matches the maximum capacity of the oil tank. Move it to the lower position and check that the reading it 0.

4 Bearing Lubrication

4.1 Mechanical Setup

Used sensor type TR Electronic GmbH LA66K with a measuring range of 139mm and max. resolution of 0.01mm.

Tank by supplier SKF has a max. capacity of 6 liters.

The sensors rod is not reaching down to the bottom of the tank - additionally there is a (necessary) distance sleeve with 40mm length (Position 51 in mechanical drawing.

This results in a "dead volume" of approx. 2.5 liters where we are not measuring.

Check together with the mechanics that the floater can pass through the tank cover without problems. Check that the distance between floater and opening hole is enough and not limited by welding or paint disturbances.

4.2 Hardware Configuration

Setting in HW config should match the actual sensor length (==139mm) otherwise we do not get the max. resolution.

Set total measuring range hi/lo and direction according to the screenshot above (decreasing, 0-13900).

4.3 WinCC Parameters

Having set the HW COnfig parameters like described above, we set following WinCC parameters.

First of all - determine the dead volume where we are not measuring.

To do this start with an empty tank and fill in known amounts of oil until the raw value begins to change.

Note the amount of oil that you have filled in.

The actual level should be displayed in liters.

We receive a max. value of 13900 from the sensor. To calculate liters from mm height we convert it to decimeter, so set:

FacDiv to 10000

To set FacMul we need the area of the tank in dm². The tank is not straight, but is slightly cone-shaped with a lower area of approx. 1,38dm*2,52dm=3,4776dm² and an upper area of approx. 1,51dm*2,65dm=4,0015dm². Additionally the pump itself is using up some of the space...(0,5027dm²).

So you should start with a original FacMul of 3,6.

Please do fill in a known oil volume and compare the changing raw value and the resulting Act-value and adjust FacMul accordingly.

You still should be somewhere in the range of 3.6 for FacMul. Note that this is an averaged value resulting from the non-linear shape of the tank.

Having set FacMul and FacDiv accordingly and having found out the point when the raw value starts to change, calibrate to zero now.

It would be nice now to display roughly 6 liters with a full tank.

Therefore the offset must be set to the previously determined amount of oil needed to overcome the dead volume of the tank.

If you set this offset to e.g. 2.5 liters, you MUST also increase Warning Minimum and Alarm Minimum setpoint by this offset.

By default Warning minimum setpoint is 1 liter > increase to 1liter + Offset (e.g. 3.5 liters). Alarm Minimum setpoint by default 0.5 liters > increase to 0.5 liters + offset (e.g. 3.o liters).

5 TDX Inlet

5.1 Hardware Configuration

File:TR LA66 1014mm Encoder Parameter.jpg

Settings for a 1014mm Encoder with 0,01mm Resolution

The Calculation is done as follows:

• Measuring Range / Resolution: 1014mm/0,01mm = 101400
• Convert to Hex: 101400(d) -> 18C18(h)
• Take the last for numbers and convert them back to decimal: 8C18(h) -> 35864(d)

5.2 Scaling in the Software

• Make sure that your piece of Software uses only 32bit values!
• Use for scaling the 1/Resolution Factor

6 Troubleshooting

6.1 Sensor wont`t go online on Profibus

• After clarifying with T&R we got following Information:
• “The LA66 sensors consists of the basic sensor part and the communication board. Both parts have been reworked recently.”
• So now there is an old and new “bus-cap” and “sensor part”
• The old bus-cap is working with both new and old sensor parts.
• The new bus-cap is only working with the new sensor part.

• How to tell the difference?
• A new sensor part has the date of manufacturing on the name plate and the date must be starting from October, 19th 2021.

File:Blt1.PNG

• Attention!
• The date of manufacturing is printed as yyyy/ww/d
• yyyy = year
• ww = calender week
• d = number of day (1=Monday, 2=Tuesday, …)

• The example above is showing Friday, calender week 26 in 2021, which means July 2nd 2021.
• If your date is higher than 2021/42/1 you have a new sensor part.

• Bus-Cap:

• The new one got the T&R logo engraved, the old one doesn’t.

File:Blt2.PNG

Definition