48513 - Compact LVD Installation Instructions

48513 - Compact LVD Installation Instructions
Installation Instructions
Compact Low Voltage Disconnect Switch
Part Number: 48513, 48513-01 & 48713
Caution: Do not mount device in a location where it will
be exposed to a direct heat source, moisture or salt spray.
Mount device in a location where there is air circulation.
Under normal operating conditions this device may run
hot. Use caution when handling.
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.
3. Connect LVD “Load+” stud to accessory loads using
appropriate heavy gauge cable.
Connection Schematic
4. Optional connections:
Ignition Switch
or Alternator
Low Voltage
50 mA
alarm LED
Pin 4
Pin 3
Pin 1
Pin 2
Mom. On
SPDT Switch
Pins in Deutsch connector
General Specifications
Environmental:-40°C to 85°C. SAE J1455 & J1113
Electronics sealed to IP67
Ignition-proof to ISO 8846
Electrical: 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 in
inches (mm)
© 2016 Littelfuse Commercial Vehicle Products
(p/n 54104,
55088, 58328-53
or similar)
To use the manual feature, 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
To use the alarm feature, 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.
To use the ignition countdown timer feature,
Connect Pin 4 “IGN” to the ignition switch
(usually to the run position).
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
(not to exceed product rating).
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.
1 of 2
Form: IF-162
Rev: 112816
Installation Instructions
Compact Low Voltage Disconnect Switch
Part Number: 48513, 48513-01 & 48713
Normal Operation Summary
Additional Operating Details
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.
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.
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.
The user has the option to override the imminent
disconnect by applying battery voltage to
the manual pin.
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 48513/48713 also has an optional key off
timer disconnect feature. For this feature to work,
the ignition pin of the 48513/48713 (pin 4) must
be connected to a keyed ignition source. If it is
connected and the ignition key is switched off while
the LVD’s output is on, the 48513/48713 starts a 15
minute timer. If the battery voltage remains above
the disconnect threshold while the timer is active,
the output will remain on for 15 minutes and then
disconnect the load. If the battery voltage should drop
below the disconnect threshold for one minute before
the timer expires, the alarm will sound for one minute
and then disconnect the load. If ignition terminal is
connected and the battery voltage drops below the
disconnect threshold for one minute while the key is
on, the loads will not disconnect but the alarm will
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 continuously (no pulse)
until the user corrects the cabling. If the load energizes
immediately when Battery+ is connected and stays on no
matter the voltage or the position of the manual switch,
check the B+ and Load connections to make sure they are
connected to the correct terminals.
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 48513/48713
battery terminal or by master disconnect switch) to reset
the unit and begin operating. Investigate and eliminate
the cause of the overcurrent as repeated extreme
overcurrent may damage the unit.
Accepts DT06-4S
Deutsch Connector
4.50 [114.3]
Ø0.28 [Ø7.1]
4.27 [108.6]
2 81 [53.3]
4 [101.6]
Specifications, descriptions and illustrative material in this literature are as accurate as known at the time of publication,
but are subject to changes without notice. Visit littelfuse.com for the most up-to-date technical information.
© 2016 Littelfuse Commercial Vehicle Products
2 of 2
Form: IF-162
Rev: 112816
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