littelfuse if 162 48513 lvd instruction guide
SureStart™
Compact Low Voltage
Disconnect Switch
12V/24V DC
100A at 85˚C
125A at 60˚C
3. Connect LVD “Load+” stud to accessory loads using
appropriate heavy gauge cable.
4. Optional circuit connections:
48513
LVD
48513-01 LVD with harness
•
Connection Schematic
Load
Load
•
Master
Disconnect
Opt.
+
Battery
Battery
+
Ignition
Ignition
Switch /
Switch
Alternator
Pin 4
PinPin
1 4
Pin 1
SureStart
Compact
SureStart
Low
Compact
Low
Voltage
Voltage
Disconnect
Disconnect
12V 50mA
alarm 50mA
(LED
and/oralarm
buzzer)
LED
and/or
buzzer
Pin 3
Pin 3
Pin 2
Pin 2
•
•
Mom.
On
Mom.
On
On
On
SPDT
SPDT
On-Off-(On)
On-Off-(On)
switch,
CHswitch,
54104,
CH 54104,
55088,
58328-53
or55088,
similar58328-53
or similar
Pins in Deutsch connector
Pins in Deutsch connector
Installation
Under normal operating conditions this device may run hot.
Use caution when handling. We recommend mounting away
from direct heat sources, and where there is good air
circulation.
Note: All connections to pins 1-4 should be made using a
12804 harness connector or a Deutsch DT06-4S connector.
1. Disconnect the battery or power supply or switch it off
with the master disconnect switch before installation.
All connections to pins should be made with the
connector.
2. Connect Pin 1 to ground.
Connect Pin 2 “Manual Override” to a center common
post of a SPDT {On – Off – Mom. On} switch. Connect the
side that is active in the Mom. On position to battery
voltage. Attach the side that is active in the stable On to
ground.
Connect Pin 3 “Alarm” to a audio/visual alarm (voltage
rating appropriate for your system) or relay that draws
less than 250mA. Connect the other side of the alarm
device to Ground
Connect Pin 4 “IGN” to the ignition switch (usually to the
run position) or alternator output.
Unused locations in the connector should be filled with
plugs provided.
5. Connect LVD “Battery+” stud to the battery positive
terminal (or battery positive terminal block) using
appropriate heavy gauge cable and proper fusing.
NOTE: If a master disconnect switch is used, the LVD
should be installed “after” the master disconnect, such
that the master disconnect switch can be used to shut
off power to the LVD.
6. Reconnect the battery or power supply.
Normal Operation Summary
•
When the unit is powered up it goes into auto-detect
mode, determines if it is in a 12V or 24V system, and
sets the parameters for operation.
•
When the voltage is above 13.0V/26.0V for 10 seconds,
the LVD will automatically connect the loads to the
battery.
•
When the voltage drops below 12.1/24.2V for 60
seconds, the Alarm will signal, warning the user that
the loads are about to be disconnected.
CONTINUED
•
The user has the option to override the imminent
General Specifications
disconnect by applying battery voltage to the Manual
Environmental:
-40˚C to 85˚C. SAE J1455 & J1113
pin.
Electronics sealed to IP67
•
After 60 seconds of the alarm, the loads and the
alarm will be disconnected.
•
The alarm can be audio, visual or both.
•
Connecting the manual pin to ground will force the
unit to stay shut down as long as that pin is
connected to ground
•
The 48513 also has a factory setup timer disconnect
feature which monitors the voltage and the ignition
switch. The timer begins when the voltage falls
below the connect voltage, yet is above the
disconnect voltage, and when the ignition pin goes
from battery voltage to off. If the ignition stays off
and the battery voltage stays below connect voltage
for 15 minutes, the LVD will shut off the loads. This
feature is disabled if the ignition pin is not
connected.
Additional Operating Details
Under/Over Voltage - After the LVD initializes, if the voltage falls below
the low cut off value (7V/16V) or above the overvoltage cut off value
(18V/36V) the unit will disconnect the loads until the voltage returns to
the acceptable range. If the device is out of voltage range the Manual
feature is disabled .
Connection Check – Upon power-up, the LVD initially checks to ensure
proper cabling, specifically the Battery+ and Load+ connections. If
improper cabling is detected, the LVD will activate the alarm until the
user corrects the cabling.
Manual Override - When the user uses a switch to connect the Manual
pin (Pin 2) to battery voltage for 1 second, it forces the unit to stay
connected for 15 minutes, and then it returns to automatic mode (Alarm
snooze).
Overcurrent Shutoff - When the output current exceeds the preset
threshold of ~135A for 3 seconds, the loads are disconnected and the
alarm is activated. A reset can be accomplished by connecting the manual
pin to battery voltage (manual override). If a switch is not used, similar to
a Type II circuit breaker, power must physically be removed from the unit
(at the Battery, at the 48513 battery terminal or by master disconnect
switch) to reset the unit and begin operating.
Ignition-proof to ISO 8846
100A at 85˚C
125A at 60˚C
Operating Voltage 9-32V
1mA max quiescent current
Disconnect:
12V - Less than 12.1V for 2 minutes
24V - Less than 24.2V for 2 minutes.
Factory programmable.
Accuracy ±100mV
Connect
12V - More than 13.0V for 10 seconds
24V - More than 26.0V for 10 seconds
Factory programmable.
Accuracy ±100mV
Alarm:
Active low, 50mA
Activates 1 minute before disconnect.
Dimensions:
Overall height is 3.1” [79mm]
See drawing below. Dimensions are in inches [mm]
Submit technical questions to: [email protected]
Electrical:
Pin 4 - Ignition
Pin 1 - Ground
Pin 4 - Ignition
Override
Pin 1 - Ground
Pin 3 - LED/Alarm
(Warning)
Pin 3 - LED/Alarm
(Warning)
Pin 2 - Manual
Over Ride
CONNECTOR TO ACCEPT
DEUTSCH DT06-4S CONNECTOR
Pin 2 - Manual
Over Ride
4.50 [114]
CONNECTOR TO ACCEPT
DEUTSCH
DT06-4S
CONNECTOR
4.00
[102]
Ø0.28 [Ø7]
4.50 [114]
4.00 [102]
Ø0.28 [Ø7]
4.27 [109]
2.10 [53]
Secondary Parts
12804 Compact LVD Harness Assembly (or Deutsch DT06-4S Connector
0462-201-16141 Terminal with W4S Wedge)
58326-06 Rocker Switch
55088 Toggle Switch
Please consult the factory if you need further assistance
617. 268. 2100
8am - 4:30pm US Eastern Time
4.27 [109]
Battery
Terminal
Battery
Terminal
2.10 [53]
HEX NUT,
1/4-20, TYP
HEX NUT,
1/4-20, TYP
Load
Terminal
Load
Terminal
www.colehersee.com
IF-162
rev B
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