Connecting dual channel inclinometer to SIRIUSiwe

HI,

Are you able to assist with connecting a SIRIUSiwe-6xSTGM-2xSTGM+ to a dual channel inclinometer, powering the inclinometer from the Sirius? Inclinometer is a DAS-30A (Input supply 7-30V 20mA)

As the sensor is dual output, we will be connecting to 2 Sirius channels, I have come up with the below 2 wiring diagrams (matching the OEM wiring colours, with the exception of White being shown as grey).

I'm unsure if one method is preferred (or if neither are suitable). The 2 options being:

1. Provide power to the sensor between the Exc+ and Gnd with the excitation voltage set to 15, providing the sensor nominally 7.5V (approx. 20mA required by the sensor)
2. This seems to be a more simple option, however Im unsure if this will be getting close to the channel excitation current limit given it would only be using one half of the supply.
3. Power the sensor between the Exc+ and Exc- (Excitation voltage 10-15V) and calibrate out the scaling offset from not referencing Gnd.
4. I'm unsure of the correct method to connect the second axis WRT connecting EXC+ and SNS+ and GND to IN-.

Option 1

Can you please confirm the below wiring diagram is correct?

Option 2

Can you please confirm the below wiring diagram is correct?

For the X-Axis (I believe the X- Axis is correct)

1. Power being provided from the X-Axis between Exc+ and Exc-.
2. Scaling of the sensor will need to be corrected since the reference will not be GND but EXC-.
3. A short circuit between pin7 & pin4 will be needed, this manually connect the input as a 3-wire single ended mode with the power sensor.

For the Y Axis I'm uncertain if the diagram below is correct

1. Do I need to connect Exc+ to Sns+?
2. Does GND and IN- need to be connected in this case?
3. Is connecting a common sensor ground from the X-Axis and into the Sns- and Exc- the correct method?

Thanks

Dear Tristan,

Both options are correct, it is just the scaling that would need to be adjusted.

The OPTION 1 is correct, just put the excitation on first channel to 15V, this will provide +7,5V on EXC+ pin. Keep the jumper to SNS+.

The second channel can be set to single-ended. The IN- Pin 7, will be automatically connected to GND4 internally:

OPTION 2:

There is no need to connect the EXC- and SNS- lines between the channels. Since the second channel is in single-ended mode there is also no need to short the PIN6 nad Pin1.

You will still need the connection between PIN7 and GND on the first channel.

Regarding the scalling in the second option, it needs to be adjusted to the EXC- value.

For example, by Scaling ‘by two point’, we tell the system that 0 real Volt equals 0 psi, and 1 real Volt equals 100 m/s2. If you look at the graph on the bottom corner of the dialog, you can see that the real input signal has a min of 0.01466 V at this moment, which is being scaled to 1.466 m/s2, which is exactly what was expected.

In this case, the 0 is not at 0V, but the whatever value that is on the EXC-.

It would be best if you can ''experiment'' with the scalling. If they could set a known value on the sensor and then observe what are you getting on the scope in the cahnnel setting menu. Just to be sure if the scaling is set correctly.

Best Regards.

Rok