DHC-100
PEAKTRONICS U.S. Patent 7,466,100 applies to this product 5
erations and their associated resistance. See Special Ap-
plications for details on using the Override Input for an
Auto/Manual Station.
RESISTANCE OPERATION
> 4.3K ohms OFF
3.3K ohms ±5% LATCH
2K ohms ±5% OPEN
1.2K ohms ±5% CLOSE
510 ohms ±5% STOP
The OPEN function will operate the motor in the
open direction as set by the OPEN mode, while the
CLOSE function operates the motor in the closed direction
as set by the CLOSE mode. The LATCH function will
maintain the previously selected function; this allows
momentary switches to be used for the OPEN and CLOSE
functions. The OFF and STOP functions turn the motor
off, which also unlatches the OPEN or CLOSE functions.
Note that the OPEN and CLOSE functions may
work in reverse until the open and closed positions are set
by the OPEN and CLOSE modes. The DHC-100 will au-
tomatically turn the motor off when the open or closed
positions are reached. However, if a feedback fault occurs
(see FAULT INDICATORS), the motor will be turned on
for a period of 15 minutes in the selected direction. For
this reason, limit switches should be used when using the
OVERRIDE mode, and should be set to a position ac-
ceptable for the application. The 15 minute period can
also be terminated using the OFF or STOP function.
The motor is also automatically turned off if the
DHC-100 detects a stall (see STALL DETECTION). An
OPEN or CLOSE operation can be attempted again after
switching to the OFF, LATCH, or STOP functions first.
AUTO
The AUTO function is the normal mode of opera-
tion for the DHC-100; all the other functions are used to
set up the unit. While in AUTO, the unit can be controlled
by various external signals, some of which can be selected
by the COMMAND TYPE function. When the unit is not
in the AUTO mode, all external controls described below
will be disabled.
Once the open and closed positions have been set,
the AUTO mode will control the position of the actuator
according to the command input signal. For an input sig-
nal of 0V (for 0-5V or 0-10V input), 1V (for 1-5V input),
2V (for 2-10V input), 4.0 mA (for 4-20mA input), or 0%
(for a Digital input), the DHC-100 will position the actua-
tor to the closed position as set by the user. Conversely,
an input of 10V, 5V, 20mA, or 100% will position the
actuator to the defined open position.
When the DHC-100 is configured to use a 0-5V,
0-10V, 1-5V, 2-10V, or 4-20mA command, the command
signal should be connected to the appropriate pin on J2 -
note that the unused input pin must be left unconnected.
When the DHC-100 is configured for a Digital command
type, an appropriate communications option module must
be installed. A communications module may be installed
when using one of the analog command types and can be
used to override the analog command. The AUTO indica-
tor will flash whenever the unit is being controlled by the
communications module.
MANUAL/FB POT CAL
The MANUAL/FB POT CAL function allows
manual operation of the actuator by using the adjust but-
tons (▲ and ▼) without affecting any other settings with-
in the DHC-100. When the ▲ button is pressed, the mo-
tor winding connected to J1-1 is turned on while the ▼
button turns on the J1-3 winding. Whether the actuator
moves toward the open or closed position depends on
which motor winding is connected to J1-1 and J1-3.
The FB POT CAL feature provides an indication
of the feedback potentiometer's setting. When the MAN-
UAL/FB POT CAL function is selected, the Manual/FB
Pot Cal indicator will turn on - it may flash or be on
steady, depending on the actuator position. The indicator
will be on steady whenever the DHC-100 detects that the
feedback potentiometer is at midrange of its rotation. As
the actuator 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/FB POT CAL), and the limit switches
should be set outside of the operating range (see STALL
DETECTION FEATURE). 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 function, OPEN), the DHC-100 will retain the
setting as the defined closed position.
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