14
DCU 410 Engine Panel Installation
400 Series Installation and Configuration
Minimum capacity: 5A
Note! There are fixed low battery voltage alarm setpoints.
For the primary supply, these are at 21V and 18V. For the
Secondary supply, the setpoint is at 20V.
All these alarms are delayed.
Use a twisted pair wire to minimize the effect of noise on
the supply cables. Connect the cables straight from the
battery (and NOT the starter engine) and keep the cable
as short as possible.
Use at least 2.5mm
2
wires for the power supply.
Secondary Power Supply [3
–
4]
It is recommended that the secondary supply is connected
to a redundant power supply to ensure sufficient supply
voltage upon cranking the engine.
Without a separate secondary supply, a crank can result in
a reboot of the DCU.
Power Supplies in General [1
–
4]
Mandatory straps when not using opto-coupling
The DCU support opto-coupled inputs and outputs on
several of its terminals.
When this capability is not used, the following straps
must be inserted.
Purpose
Strap
Comment
Power the DCU
7-8 and 9-10 Disconnect jumper 7-8 to
set the DCU into System
Off mode.
Activate Switch
Inputs
25-26
Disconnect this jumper if
an external 24V supply
(not terminal 16) is used
to activate the switch
inputs.
