LIU-4

The LIU-4 provides signal conditioning for four 5 wire LVDT positioning sensors. When the LVDT sensors are being used in latency critical control systems, the conditioned signals are passed to the host ECU as four 0 to 5V analogue outputs. Where LVDT sensors are used for diagnostics or where control system speed is less critical, the signal conditioned values can be made available over the CAN bus communications link in order to reduce system harnessing.

A common primary sine wave signal is generated to supply all 4 LVDT sensors. This prevents beat notes being generated due to stray magnetic coupling when the LVDT sensors are used in close proximity using similar frequencies. The frequency and amplitude of the common primary signal are software programmable. The primary signal to each LVDT is individually buffered such that an overload on one sensor primary does not affect the other.

The four 0 to 5V LVDT signal conditioned analogue outputs are individually software programmable for gain and offset in order to provide more flexibility for the measurement span. LVDT sensor open circuit diagnostics are available through the CAN bus communications link.