Notes for RVDTs

The following must be observed when commissioning RVDTs:

• An RVDT should be parameterized like a corresponding LVDT sensor.
• The following information is to be converted and entered specific to the RVDT:
• RVDT sensitivity (0x80n1:16 "Sensitivity")
• RVDT maximum travel path (0x80n1:18 "Overall sensor range")

RVDT sensitivity specification ("Sensitivity", index 0x80n1:16)

The sensitivity of an RVDT sensor indicates the ratio of the measurement output voltage as a function of the core displacement and the excitation voltage and is often referred to as the scale factor

Scale factor [V_output/V_supply/°_{measuring path}]

Conversion formula:

Sensitivity [mV/V/mm] = 1 / (Scale Factor [V/V/deg])

RVDT specification of maximum travel path ("Overall sensor range", index 0x80n1:18)

For RVDTs the maximum travel path or maximum angle of rotation is not specified in mm but in degrees [°]. This information should be entered directly in index 0x80n1:18 "Overall sensor range", symmetrically with "+/-".

If the maximum angle of rotation is not specified, it can be calculated using the following information. This information is required to set internal gain factors so that a valid value is still measured at the maximum angle of rotation. If the value entered is too low, amplitude errors may occur in the limit range. These are displayed via the process data 0x60n0:04 "Input error".

Maximum angle of rotation = Maximum signal voltage Usig / ScaleFactor / Excitation voltage Uexc