ITS-12 User Manual
Operation
The voltage sensing ITS-12 is an automatic switch
designed for 12 volt vehicle electrical systems with
negative ground. The model ITS-12 is rated at 35 amps
continuous duty. Using the 10 position rotary switch,
you can select one of the following timer settings of:
2, 15 or 30 minutes and 1, 2, 3, 4, 5, 8 & 12 hours. In
addition, each setting also includes a LVD (Low Voltage
Disconnect) threshold as well. See table on right.
Two built-in LED lights show the current status. When
the engine is running, a solid GREEN LED light means the
timer is passing power through the unit (13.0~14.5V).
When the vehicles engine is shut off, a voltage drop will
occur and a slow FLASHING GREEN LED light is displayed
and turns ON the timer (below 12.8V). A red flashing
LED light will display when its output power to your
electronics reaches the users preset timer setting (2
minutes to 12 hours). No ignition connection is required.
ITS-12 includes an Over Voltage Protection System which
will automatically shut off your electronics if the voltage
reaches over 16 volts. A solid RED LED light will display
until the over voltage condition is corrected.
Hook-up & Installation
The ITS-12 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
ITS-12 in between the battery and the DC feed side of the
radio using the supplied ring terminals. When installing
the ITS-12, 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 timed out timer and/or LVD condition
and give you 15 minutes of emergency operation time.
0:
2 m
11.4 LVD
1:
15 m 11.4 LVD
2:
30 m 11.0 LVD
3:
1 hr
11.4 LVD
4:
2 hr
11.4 LVD
5:
3 hr 11.0 LVD
6:
6 hr 11.4 LVD
7:
7 hr
11.4 LVD
8:
8 hr 11.0 LVD
9:
12 hr
11.0 LVD
ITS-12 ▪ Rev 4/2015
OUTPUT
+
-
INPUT
LED
AUX SWITCH
+
-
R
G
To Electronics
To Battery
ÑITS-12=Ó
DC Timer/LVD Battery Guard
23695 Via Del Rio, Yorba Linda, CA 92887 ▪ 714-674-0073 Phone ▪ 714-674-4949 Fax
