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 14 of 26
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 automatically turn the motor off when the open or closed positions are
reached. However, if a feedback fault occurs (see FAULT INDICATOR), 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 acceptable for the application. The 15 minute period
can also be terminated using the OFF or STOP function.
The motor is also 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 operation 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 INPUT 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
signal 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 actuator to the closed position as set by the user. Conversely, an input of 5V,
10V, 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. 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
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