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4.2 Relays, opto-couplers and analogue outputs
The LPU2 provides relay, opto-coupler and analogue outputs.
Function # of functions
Switch-over contact relay outputs: 4
Closing contact(s) relay outputs: 4
Opto-coupler outputs: 8
Two analogue outputs can be individually programmed to provide requested speed
information.
5 Calibration
The JLN-900 speed log has calibration functions. The speed calibration factors and
transducer alignment are entered into the speed log via the Speed Log Master Display, as
appropriate for the SOG and STW respectively.
STW range: -50.00% to +50.00% of sensed speed in 0.01% steps.
Up to 3 different draught conditions.
Up to 10 speed calibration points.
SOG range: -50.00% to +50.00% of sensed speed in 0.01% steps
SOG transducer angle range: -180.0º to +180.0º in 0.1º steps.
The STW-speed log generally needs calibration correction on all ships due to properties of
water flow around the hull. The SOG log transducer angle calibration is only needed when
correct mechanical transducer alignment is not fully obtained. The SOG log seldom needs
calibration and requires extremely accurate reference data.
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