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DHC-400
pending on the actuator position. The indicator will be on
steady whenever the DHC-400 detects that the feedback
potentiometer is at midrange of its rotation. As the actua-
tor moves, causing the feedback potentiometer to move
away from midrange, the indicator will begin to flash, and
the indicator will flash at a decreasingly slower rate as the
actuator moves further away from midrange.
By using the adjust buttons to position the actua-
tor to midstroke (half way point between the desired open
and closed positions), the feedback potentiometer can then
be adjusted until a steady light occurs. This insures that
the feedback potentiometer has maximum range to reach
the open and closed positions.
CLOSE
The CLOSE function is used to set the desired
closed position; however, prior to doing this, the feedback
potentiometer should be checked for optimum position
(see MANUAL/POT CAL), and the limit switches should
be set outside of the operating range (see LIMIT
SWITCHES). In the CLOSE function, the adjust buttons
are used to set the actuator to any desired position, and
upon pressing the MODE button (to select the next func-
tion, OPEN), the DHC-400 will retain the setting as the
defined closed position.
Upon selecting the CLOSE function, the DHC-
400 will begin moving the actuator to the previously set
closed position; it is not necessary to make an adjustment
if the unit has been previously set to the desired position.
A command signal input of 0V, 1V, 2V, 4mA, or 0% au-
tomatically corresponds to the defined closed position.
OPEN
The OPEN function works the same way as the
CLOSE function with the exception that the adjust buttons
are used to set the desired open position. As with the
CLOSE function, upon selecting the OPEN function, the
actuator will move to the previously set open position.
Once the desired position is set, the DHC-400 will auto-
matically associate a command signal input of 5V, 10V,
20mA, or 100% to the open position.
AUX CLOSE OUTPUT
The AUX CLOSE OUTPUT function is used to
set an optional output setting that is associated with the
closed position - an appropriate relay option module is
required to use this output. The adjust buttons are used to
set the actuator to a desired position. Whenever the actua-
6
tor position falls between the defined closed position and
the Aux Close position, the Aux Close Output indicator
will flash. Additionally, the DHC-400 will turn on a relay
output on the optional relay module - the output can be
used to drive an alarm or merely act as an auxiliary limit
switch.
tion, the DHC-400 will begin moving the actuator to the
previously set position. It is not necessary to make an ad-
justment if the unit has been previously set to the desired
position.
AUX OPEN OUTPUT
an optional output setting that is associated with the open
position - an appropriate relay option module is required
to use this output. The adjust buttons are used to set the
actuator to a desired position. Whenever the actuator po-
sition falls between the defined open position and the Aux
Open position, the Aux Open Output indicator will flash.
Additionally, the DHC-400 will turn on a relay output on
the optional relay module - the output can be used to drive
an alarm or merely act as an auxiliary limit switch.
tion, the DHC-400 will begin moving the actuator to the
previously set position. It is not necessary to make an ad-
justment if the unit has been previously set to the desired
position.
COMMAND TYPE
figure the command signal input for either 4-20mA, 1-5V,
0-5V, 0-10V, 2-10V, or digital so as to match the type of
command signal being used. Upon selecting the COM-
MAND TYPE function, the Command Input indicator will
turn on steady, while the indicator for the selected type
will flash. Use the adjust buttons (▲ or ▼) to select the
desired input type. The selection will be saved when the
MODE button is pressed, which will also advance the unit
to the LOSS OF COMMAND function.
LOSS OF COMMAND
input type for the command signal, the DHC-400 will de-
tect when the command signal is lost or out of range. A
loss of command condition is detected whenever the input
is disconnected, the input becomes less than 0.75V (for 1-
5V input), 1.5V (for 2-10V input) or 3mA, or the input is
U.S. Patent 7,466,100 applies to this product
Upon selecting the AUX CLOSE OUTPUT func-
The AUX OPEN OUTPUT function is used to set
Upon selecting the AUX OPEN OUTPUT func-
The COMMAND TYPE function is used to con-
When using 1-5V, 2-10V, 4-20mA, or a Digital
PEAKTRONICS
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