1 Get Information of the sensor[edit | edit source]
The DMA2 is a strain gauge amplifier processes sensor signals in the analog mode. The parameter values, however, are digitally adjusted. LEDs indicate the operating status. The digital display shows the parameter value respectively the output signal.
2 Connection[edit | edit source]
3 Operations[edit | edit source]
- Preparation
- Apply power to the amplifier with connected sensors. Wait 15 minutes to warm up.
- Ensure that the completely mounted sensors are loaded with the normal pre-load acting in the regular operating mode without any additional extraneous loads. In the case of Web tension sensors this is the roll weight without any web (foil, paper, ...)
- Adjustment mode
- First press and hold the SET key to switch from the operating mode into the adjustment mode, afterwards press the menu key (⇒) briefly and release the SET key.
- The display indicates the 1. menu step which can now be changed.
- For the second, third and any additional menu step do not press the SET key instead use the menu key (⇒) to select the desired menu point, for instance, to make changes.
- Storing of changes
- Press the SET key until the LED goes OFF. This activates the adjustment procedure and the LED lights up until the procedure is completed. The amplifier switches now automatically into the operating mode.
- Leaving the adjustment mode without storage
- When exceeding the waiting time of 20 seconds the amplifier switches without changes automatically into the operating mode. An alternative is pressing the menu key beyond the 8. menu step.
4 Setup Amplifier[edit | edit source]
The most settings are presetted by manufacturer.
- Gain
Example: Sensor data: nominal Rating 0,75 m V/V bridge supply voltage: 10 V (the output signal is therefore 7,5 mV = 0.0075 V at nominal force)
Amplifier output: 10 V at nominal web tension
0 V at zero web Tension
Gain=10V/0,0075V=1333,33
- Zero point adjustment
- Ensure that the completely mounted sensors are loaded with the normal pre-load
- Press and hold the SET key until the device is switching into the operating mode.
5 Calculate the PVSS factor[edit | edit source]
- Ensure how many weight cells are mounted on your application
Example:
Number of weight cells = 2 Nominal force = 25k*2 = 50000N
Maximum weight = 50000/9,81 = 5096,8 kg <- set this value in PVSS
