ASAHI/AMERICA, INC 655 ANDOVER STREET LAWRENCE, MA. 01843 TELEPHONE 800-343-3618
Location: assembly/manuals Series 92 A/C Modulating Svc Manual Gen II Rev. A 11/15/19
Page 15 of 26
to override the analog command. The AUTO indicator 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 buttons ( and ) without affecting any other settings within the
DHC-100. Whether the actuator moves toward the open or closed position dep-
ends on which motor wire is connected to J1-1 and J1-3.
The FB POT CAL feature provides an indication of the feedback potentiometer's
setting. When the MANUAL/POT CAL function is selected, the Manual/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 actuator 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 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-400 will
retain the setting as the defined closed position.
Upon selecting the CLOSE function, the DHC-100 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% automatically 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
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