TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
5
07/24/20
www.atcontrols.com
IOM08032 REVISION 01
Applications 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 TDC-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 automatically turned off if the TDC-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 TDC-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 TDC-100 will position the actuator 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 TDC-100 is configured to use a 0-5V, 0-10V, 1-
5V, 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
TDC-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
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 TDC-100. When the ▲ button is pressed, the
motor 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 POT CAL feature provides an indication of the
feedback potentiometer's setting. When the MANU-
AL/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 TDC-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 TDC-100 will retain the
setting as the defined
closed
position.
