9CyScan Positioning System • Installation and Maintenance Guide r1.1
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Power Supply Unit (continued)
! IMPORTANT: 0V is not the same as GND. 0V is the power supply return whereas
GND is a digital ground connection for the communication ports. If 0V and GND
are crossed or joined, the system will not function correctly.
! IMPORTANT: When replacing the lid on the PSU, ensure that the rubber seal is
smeared with silicone grease (Dow Corning® DC4) to maintain a watertight fit.
To insert wires:
! WARNING: Ensure all power is removed from the
system before altering any wiring.
1 Push a small flatblade screwdriver into the square
vertical hole at the front of the connector block
and press down on the lever inside.
2 While pressure is applied to the screwdriver, insert
the required wire(s) into the round hole adjacent to
the square hole.
3 Remove the screwdriver. Check that the cable is
securely held in place.
DP Signal Crossover
The RS485 connection between the
CyScan PSU and the vessel’s DP
system requires a crossover in order
that transmit and receive signals are
correctly routed. Ensure that the
crossover is correctly performed as
the cable from the DP system is
wired into the PSU.
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