Power Supply - Advanced Navigation Spatial FOG Dual Reference Manual

Spatial FOG Dual Reference Manual
Page 33 of 138
Version 1.0
26/06/2015
Illustration 16: Spatial FOG Dual mounting plate
9.4

Power Supply

A high level of power supply filtering has been built into Spatial FOG Dual to allow for
reliable operation in demanding environments. Spatial FOG Dual contains a fully
isolated power supply and has separate grounds for power and signal to ensure that
power supply noise does not corrupt communications or cause ground loops with other
equipment. When wiring the system, the signal ground should be routed with the
primary RS232, auxiliary RS232, GNSS RS232 and GPIO pins. The power ground should
be routed with the power supply to the power source.
A power supply should be selected that can provide at least the maximum current
calculated from the graph in Illustration 11.
Spatial FOG Dual contains an active protection circuit on the power supply input that
protects the unit from under-voltage, over-voltage and reverse polarity events. The
protection circuit shuts off power and automatically recovers the unit to full operation
once the fault is removed. Take care when running the unit close to its under-voltage
lockout of 9 V because small voltage drops can engage the under-voltage shutdown
and potentially oscillate between the on and off state. It is recommended that the unit
is always run at 10 V or more to avoid issues associated with this.