LIND DC Power Adapters Operating Instructions Manual page 112

Timer start
The timer contacts will close when the engine is started and the alternator is charging the battery
(battery voltage exceeds 13.5 volts). SDT timing will start when the engine is turned OFF and the
battery voltage decreases to below 13 volts.
Optional connection of the IGN terminal will result in the timer starting when the ignition switch
is opened. If the IGN terminal is connected to the accessories position of the ignition switch, the
loads will be energized with the key in the accessories position.
*Special Note: If the vehicle electrical system does not exceed 13.5 VDC with the vehicle running,
the "IGN" terminal connection must be used or incorrect Shut Down Timer operation will occur.
Timer Setting
The SDT ON time after engine shut OFF is set with the potentiometer on the top of the SDT
unit. A small screwdriver or key can be used to set the potentiometer.
Operation
The Shut Down Timer is intended to shut down electrical equipment at a preset delay time after
the automobile engine is turned OFF. This protects the battery and the equipment from damage due
to over discharge or low input voltage.
• Mount the SDT in a cool, dry place using #10 bolts, nuts, washers and lock washers. The SDT is
connected between the +12 volt of the vehicle electrical system and the loads to be controlled. The
loads may be radios and computers or other electrical loads (lights and flashers).
• The INPUT wire must be connected to the system +12 volts through a fuse with a value of 30 amps
or less. This connection can be made to a fuse panel or directly to the battery. If the SDT is connected
directly to the battery the fuse must be located within 5 inches of the battery's positive terminal. Use
the table below to select the appropriate wire gauge.
• Loads are connected to either or both of the +OUT terminals. Additional protection can be
provided by inserting manufacture recommended fuses for each load connected to the +OUT ter-
minals.
• Connect the GND terminal to a good, clean chassis ground. The SDT is powered from the +BAT
terminal and this ground.
• Activation of the SDT timing period may be automatic by sensing the battery voltage drop when
the engine is turned OFF or by the optional IGN connection to the ignition switch.
• For the ignition switch activation option, connect the IGN terminal of the SDT to the ignition
switch terminal that goes to zero volts when the engine is turned OFF.
• The GND and IGN connections carry very little current (< 0.1 amp). Wire gauge is determined
by mechanical suitability. Strip back wires .25" prior to installation.
Note - When using the ignition switch option, the SDT timing period will not start if the engine
dies.
Set up
The shut down delay time is set with the Time Delay Potentiometer on the face of the SDT.
Point the arrow on the potentiometer to the desired delay.
INSTALLATION
Amps
10
20
30
LENGTH (ft)
5 10 15 20
16 14 12 10
14 10 8 8
10 8 6 6
MINIMUM
WIRE GAUGE
(AWG)