4 | EN English
DUAL SENSING MODELS WIRING DIAGRAM
Dual Sensing Smart Start
®
SBIs or ‘D’
Series SBIs monitor both the start battery
and the auxiliary. If the unit detects that
either battery has exceeded 13.2 V the
isolator will be connected. Dual control
provides the benet of being able to
charge the main battery from a solar
panel or battery charger on the auxiliary
battery.
The SBI12D has the added feature of
allowing charge both ways.
*When using fuses make sure that
the fuse makes a good low resistance
connection. Circuit Breaker/Fuse ratings
are dependent on the type of installation
and the size of the loads.
Fuse*
Fuse*
Start
Battery
SBI12D
Solar
Panel
Circuit
Breaker*
Auxiliary
Battery
FAULT INDICATION
NOTE: The LED may stay ON for a period after the vehicle is turned OFF.
This is NOT a fault. Should a fault occur, the Smart Start
®
SBI is set to notify
the operator of the fault. The LED will ash repeatedly with the following
sequences:
CODE 1 2 Flashes Over-Voltage
CODE 2 3 Flashes Voltage Drop or Excessive Current Draw Fault
Fault Code 1:
If the batteries connected to either terminal of the Smart Start
®
SBI should
rise above 15.5 V (31 V on a 24 V system), the Smart Start
®
SBI will do the
following:
Disconnect, if connected. This is to prevent the source of over-voltage
reaching the other battery.
Flash the LED 2 times for 20 seconds, then reassess the fault condition,
continuing until the fault is cleared.
Fault Code 2:
If the Smart Start® SBI detects a voltage drop across its contacts of greater
than 1 V for more than 30 seconds then the unit will:
Immediately protect itself by disconnecting the auxiliary battery; and
Flash the LED 3 times for 20 seconds, then reassess the presence of a
fault, continuing until the fault is cleared.
CHECKING THE OPERATION
Once the Smart Start
®
SBI is installed follow the steps below to check your
operation:
1. Start the vehicle or apply a charge to the start battery.
2. Once the start battery voltage rises to the ‘ON Volts’ level the Smart Start
®
SBI will activate, you will hear the solenoid click and see the LED illuminate.
3. Now turn off the vehicle or remove the charger from the start battery. The
Smart Start
®
SBI will disconnect the auxiliary battery once the voltage on
the start battery drops to the OFF Volts level, you will hear the solenoid
click and the LED will turn off.
NOTE:
The amount of time it takes for the battery voltage to drop low enough for
the solenoid to turn off will vary due to the battery condition, age and state
of charge (for a new, fully charged battery, it may take days).
Check the specication table of your Smart Start
®
SBI to see the specic
voltage levels.
As per above, the LED may stay ON for a period of time after the vehicle
is turned OFF.
FREQUENTLY ASKED QUESTIONS
Why does the LED stay on after the vehicle is turned off?
The LED stays on (indicating the Smart Start
®
is On and the batteries are
linked) until the voltage drops to 12.7 V (25.4 V for SBI24). This can take a few
minutes to many hours, depending on size and state of charge of the batteries
as well as load on the batteries. To test this feature of the Smart Start
®
, make
sure the engine is turned off, then turn the headlights On. The Smart Start
®
LED should turn Off; this may take a couple of minutes.
Is the unit protected against voltage spikes?
Yes, the Smart Start
®
SBI incorporates a number of spike protection
components specically designed to reduce the risk of damaging the unit.
The Smart Start
®
SBI is also designed to prevent any spikes generated by the
solenoid coil from affecting any vehicle equipment.
What does the red LED indicate?
The red LED indicates the solenoid is activated and both batteries are
connected together and therefore are both being charged simultaneously. A
ashing red LED during operation indicates a fault.
We are experiencing repetitive switching of our Smart Start® SBI. What
could be causing this?
This can occur for one of two reasons. Firstly, switching a poorly charged
second battery into the system loads the voltage at the Smart Start
®
SBI to
below its lower voltage limit, which will cause the Smart Start
®
SBI to switch
back off.
Secondly, voltage drop due to cable length (Smart Start
®
SBI mounted too
far from start battery) can cause the voltage at the start terminal on the Smart
Start
®
SBI to be lower than at the start battery, which can also cause the unit
to switch off. Voltage seen by the Smart Start
®
SBI will now rise again until
the Smart Start
®
SBI switches back on. This switching will continue until the
cause of voltage drop is removed. On and Off Time delays are built into the
product to avoid the solenoid contacts chattering in this scenario.
Does the internal LED illuminate when I use the external override switch?
Yes.
Can the voltage limits and time delay settings be changed?
Yes. Both upper and lower voltage limits & on and off times can be changed.
However, this needs to be done at the time of manufacture and will incur a
relatively minor cost.
Can I use the Smart Start
®
SBI to control a load (e.g. fridge) without using
an auxiliary battery?
Yes. The voltage monitoring is done on the start battery side of the unit. If a
load is connected on the auxiliary side instead of a battery, the unit will still
operate when the start battery is charged, providing power to your load.
Can I use my Smart Start
®
SBI to winch off both batteries?
Yes. We recommend that the Smart Start
®
SBI be wired so it automatically
connects both batteries when the winch is turned on, through use of the Start
Assist feature on the override wire. We also recommend the use of our 200 A
Smart Start
®
SBI for this application.
Can I use the Smart Start
®
SBI on a positive chassis vehicle?
Yes. Please contact REDARC for further information.
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