Operation
The voltage sensing LVD-35 is an automatic switch
designed for 12 volt vehicle electrical systems with
negative ground. The model LVD-35 is rated at 35 amps
continuous duty. Using the 10 position rotary switch,
you can select a low voltage disconnect value of 10.6V to
12.2V. The unit will automatically shut off the DC power
to the load after the low voltage level is reached. A low
battery disconnect delay of 20 seconds is built in so that
the LVD-35 will not turn off during engine starts and
momentary current dips.
Two built-in LED lights show the LVD-35 current status.
When the voltage to the input is above the LVD users
setting, a solid GREEN LED light means that power is
passing through the unit as normal. When the voltage
reaches the LVD level, a slow FLASHING GREEN LED
light is displayed but power continues to flow through
for the 20 second delay period. A red flashing LED light
will display when the low voltage battery level has been
reached and power is now disconnected to output load
terminals.
LVD-35 also includes an Over Voltage Protection System
which will automatically shut off your electronics if the
voltage reaches over 16.5 volts. A solid RED LED light will
display until the over voltage condition is corrected.
Hook-up & Installation
The LVD-35 should be installed in between the vehicle
battery and the DC load. Typically, the load is a two-way
mobile radio, mobile computer and other vehicle DC
electronics. Standard installation involves installing the
LVD-35 in between the battery and the DC feed side of
the electronics using the supplied ring terminals. When
installing the LVD-35, you need to connect (positive and
negative DC power IN & positive and negative DC power
OUT). No ignition connection is required. This model can
be installed inside of the vehicle or engine compartment
as these units are waterproof.
CAUTION: Make sure you connect the + / – leads to the
correct polarity on both input and output. Make sure
you also use the supplied star washers and do not over
tighten the ring terminal screws.
Rotary Switch Settings
Set the Rotary Selector to the
desired setting.
Use a small flat screwdriver to
change the rotary switch position.
Detailed settings are also located
on the side of your unit.
Emergency Override Switch
An extra ring terminal position
(AUX) is located next to the LED
lights. By momentary applying 12V to this terminal (with
a user supplied switch) it will automatically override and
energize the LVD output for an additional 15 minutes of
use for emergency operation.
0:
10.6 LVD
1:
10.8 LVD
2:
11.0 LVD
3:
11.2 LVD
4:
11.4 LVD
5:
11.6 LVD
6:
11.8 LVD
7:
12.0 LVD
8:
12.1 LVD
9:
12.2 LVD
LVD-35 ▪ Rev 4/2015
OUTPUT
+
-
INPUT
LED
AUX SWITCH
+
-
R
G
To Electronics
To Battery
Selectable Low Voltage Disconnect
LVD-35 User Manual
ÑLVD-353Ó
23695 Via Del Rio, Yorba Linda, CA 92887 ▪ 714-674-0073 Phone ▪ 714-674-4949 Fax
