MAN# 650266
of current to the load. Pin 87a is usually not used when sup12V to a load, and
the terminal is left open, or unconnected.
The relay coil is what is activated to perform the “switching” action. The coil is
located between pins 85 and 86. When the relay coil is energized, pins 87 and 30 will be
connected. When the coil is off there will be a connection between pins 87a and 30.
There are two ways to energize the coil, switching power to the coil or switching ground
to the coil.
Most of Dakota Digitals products that require an external relay are ground
switching, meaning that the relay control goes to ground when activated. So for these
types of outputs one side of the relay coil needs to be connected to +12V power, and the
other side to the grounding output of the controller. Figure 2 shows how to connect a
single relay pack in this fashion. The relays in Figures 2-7 will supply +12V power to
the solenoid, or load, as long as the control output is grounded. This would be a good
application for fans, fuel pumps, and other motors.
The green fused +12V power wire should connect direct to the battery to provide
a good power source for the desired load. An appropriate gauge wire should also be used
for the +12V supply. The black “switched power” wire should also use an appropriate
sized wire to supply power to the load. The red and white coil connection of the relay
can be smaller gauge wires, around 22 AWG, since there is relatively low current draw.
BLACK
BLUE
86
87
85
30
GREEN
FUSED +12V
DO NOT CONNECT
RED
WHITE
To grounding output
12V power
TO LOAD
FIGURE 2
Single relay wiring (ground switching relay)
LATCH ACTUATOR
GROUND
CHASSIS
DAKOTA DIGITAL PDR-1 ACTUATOR
SHOWN. ANY 12 VOLT MOTOR
OR SOLENOID MAY BE USED
BLUE
GREEN
BLACK
BLUE
86
87
85
30
GREEN
FUSED +12V
DO NOT CONNECT
RED
WHITE
To grounding output
12V power
FIGURE 3
Latch wiring (ground switching relay)
