400 Series Installation and Configuration
DCU 410 Engine Panel Installation
13
Electrical Connections
General
To protect against EMC noise, we recommend that all
cables are shielded.
Note! The screen of all cables shall be connected to
ground/hull, NOT to 0V!
Some cables shall be kept as separate from other signals
as possible
–
for instance the pickup signal. Others can be
in a shielded multi-cable.
Note! Connect shield at one end only.
Grounding
Note! Please keep ground and 0V separated!
In marine installations, ground and 0V volt should not be
connected together. In a ship installation, the hull is the
“ground” whilst the battery minus
is the 0V.
In the DCU system, +24V and 0V are filtered to ground
using special filter components. This is done to reduce
electrical noise entering the system. If ground and 0V are
connected together, these filters do not work properly.
Note! Make a ground connection to terminal 100. Keep
this wire as short as possible, and at least 1.5mm2.
Terminals 46, 49, 53, 57, 60 and 100 are all ground
connections, internally connected to ground, and should
not
be connected to 0V.
Primary Power Supply [1
–
2]
The DCU is designed to run on 24VDC supply voltage.
Note! Make sure the primary supply power is sourced
directly from the battery, NOT from the starter of the
engine, as the voltage drop over the latter is significantly
higher.
Power Supply Requirements
Valid full functionality range: 18-32VDC.
