A-T Controls TRIAC TDC-100 Series User manual


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Operation Manual
1 07/24/20
www.atcontrols.com IOM08032 REVISION 01
The Triac TDC-100 is a high performance digital
positioner intended to control AC actuators, providing 450
points of resolution with quarter turn actuators ranging
from 2 sec to 120 sec and rated for 25% duty or more.
The TDC-100 has many automatic advanced features
that will enhance any actuator while making it easy to
install and set up.
The simple three button control is used to configure all
parameters the unit needs for a wide variety of
applications, and allows the open and closed positions to
be easily set for direct or reversing acting without any
rewiring. The unit can be configured for various
command types (4-20mA, 1-5V, 0-5V, 0-10V, or a digital
command) and its default operation upon loss of
command.
Various option modules are easily plugged into the unit,
providing other features such as a position feedback
signal (current or voltage), auxiliary switches, fault relay
contact, or digital communications. A wide range of data
is accessible through a digital communications module,
providing additional control or information.
TDC-100
AC Digital High-Resolution Controller
FEATURES
 Positions to ±0.1 with quarter-turn actuators ranging from 2 sec to 120 sec (with or without a brake).
 Adaptive Control feature continuously adjusts for load and actuator conditions and eliminates calibration procedures
and auto-cal operations.
 Three button control provides easy setup and eliminates the need for instrumentation.
 Polarity Detection feature allows direct or reverse acting operation without re-wiring.
 Electronic Brake feature can eliminate need for a mechanical brake in many applications, and extends mechanical
brake life when used.
 Stall Detection feature protects actuator motor from a stall condition.
 Automatic Duty Cycle Control feature prevents shutdown of a process due to a thermal overload of the actuator
motor, and allows actuators rated for 25% duty or more to be safely used.
 Operating temperature range of 0 to 60C


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
2 07/24/20
www.a-tcontrols.com IOM08032 REVISION 01
OUTLINE
TDC-100 117VAC TDC-100A 234VAC TDC-100B 24VAC


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
3 07/24/20
www.a-tcontrols.com IOM08032 REVISION 01
BLOCK DIAGRAM
DESCRIPTION
The TDC-100 is rated for motors with up to 5A running
currents and comes in three versions to accommodate
different voltage applications. The TDC-100 is rated for
117 VAC 10%; the TDC-100A is rated for 234 VAC
10%, and the TDC-100B is rated for 24 VAC 10%. The
unit is easily mounted with 2 screws and is equipped with
removable screw terminals that provide for easy field
wiring. The unit's size, mounting, and screw terminals are
compatible with the AMC-100, AMC-101 and LRC-101
series controllers - the TDC-100 can be used as a direct
replacement for those units in nearly any application.
The simple three button control (MODE, ▲, and ▼)
allows the user to perform a complete set-up from the
unit itself without the need for any instrumentation. The
adaptive control feature of the TDC-100 eliminates the
need for any calibration steps. In the simplest
application, only the closed and open positions need to
be set and the unit automatically and continuously sets
all other parameters when placed in the AUTO mode.
CAUTION ! These units are intended to be mounted in
an appropriate enclosure to avoid electrical shocks and
exposure to electrostatic charges. High voltages are
present on the outside of the unit when power is applied.
AC power should be disconnected and antistatic
measures should be taken prior to any wiring of
these units. A heater and thermostat should be
used where condensation may occur.


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
4 07/24/20
www.atcontrols.com IOM08032 REVISION 01
POWER / SIGNAL (J2)
Power is connected to pins 1, 2, and 3 as shown in the
block diagram. The fuse installed on the unit is rated for
maximum output current that can be safely delivered by
the AC outputs. Replacement fuses must not exceed the
maximum rating to prevent damage to the unit. Smaller
fuse sizes can be used with smaller motors - consult the
actuator manufacturer for appropriate fuse size and type.
An appropriate command signal, either 0-5V, 0-10V, 1-
5V, 2-10V, or 4-20mA, should be connected to pin 5 or 6
(as shown in the Block Diagram) while using pin 4 as the
return signal ground. The TDC-100 must be configured
for the type of command signal that is to be used (see
COMMAND TYPE).
Pin 7 of J2 provides an auxiliary +5V output which can be
used to connect a command potentiometer. By
connecting one end of a potentiometer to pin 7, the other
end to pin 4, and the wiper to pin 6, a local control knob
can be implemented. Pin 8 provides an auxiliary +15VDC
output which can be used to power an input or output 4-
20mA transmitter.
ACTUATOR (J1)
The actuator motor and feedback potentiometer are
connected to J1 as shown in the Block Diagram. The
Motor Neutral wire must be connected to pin 2, while one
motor winding is connected to pin 1 and the other winding
to pin 3. The feedback potentiometer wiper must be
connected to pin 5, while one end is connected to pin 4
and the other end to pin 6. The Polarity Detection
feature of the TDC-100 automatically determines which
motor winding to control based on where the open and
closed positions are set; this feature also eliminates the
need to rewire the unit for direct or reverse acting
applications.
When the ▲ and ▼ buttons are used to control the
actuator, the ▲ button will turn on the motor winding
connected to pin 1, while the ▼ button will turn on the
motor winding connected to pin 3. See MANUAL/FB POT
CAL for more details.
OVERRIDE (J7)
J7 provides a simple 2-wire connection that can override
the TDC-100 to perform a variety of external control
functions. Using an appropriate interface module,
commonly used auto/manual station switches are easily
implemented with low voltage/low current switches. See
Special Applications for more details. The factory
installed jumper between pins 1 and 2 enables normal
operation of the TDC-100 and must be installed if the
external override functions are not used.
MODE
The MODE button is used to select the desired function
of operation. When the MODE button is pressed, the unit
will switch to the next function and the appropriate LED
indicator will turn on to let the user know which function is
selected. Except for the MANUAL/FB POT CAL mode,
the associated mode indicator will be steady on; for some
of the modes other indicators will flash to indicate specific
settings associated with the mode. Each of the modes
are described in more detail in the following sections.
If a 0-5V or 0-10V command signal is used, the LOSS OF
COMMAND function cannot be used. The MODE button
will skip over the LOSS OF COMMAND mode when the
unit is configured for a 0-5V or 0-10V command signal
(see COMMAND TYPE). When the OVERRIDE mode is
enabled (see OVERRIDE MODE), the MODE button is
disabled and the Manual/Pot Cal indicator will turn on
steady.
ADJUST UP (▲) and ADJUST DOWN (▼)
The adjust up (▲) and adjust down (▼) buttons are used
to adjust the setting of any given function. When a
function is selected by the MODE button, the adjust
buttons will affect that function only. Note, that the AUTO
mode does not have any adjustable settings, and
therefore, the adjust up (▲) and adjust down (▼) buttons
have no effect. Also, the adjust buttons are disabled in
the OVERRIDE mode.
OVERRIDE MODE
The OVERRIDE mode is not selected by the MODE
button and can be enabled at anytime by connecting a
resistance greater than 250 ohms to the Override Input
(J7 pin 1 and pin 2). While the OVERRIDE mode is
enabled, the MODE button and adjust buttons are
disabled, and the Manual/Pot Cal indicator will turn on
steady to indicate that the unit is being controlled by the
Override Input. Shorting J7 pin 1 to pin 2 returns the unit
to normal operation and the previously selected mode.
Note that earlier models may not have connector J7, and
therefore do not have the OVERRIDE mode feature.
Controlling the TDC-100 from the Override Input is
accomplished by connecting a specific resistance to
select a specific operation. The table below defines the
operations and their associated resistance. See Special


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.


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
6 07/24/20
www.atcontrols.com IOM08032 REVISION 01
Upon selecting the CLOSE function, the TDC-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, 4mA, or 0% automatical-
ly 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 TDC-100 will automatically
correspond a command signal input of 10V, 5V, 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 actuator
position falls between the defined closed position and the
Aux Close position, the Aux Close Output indicator will
flash. Additionally, the TDC-100 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.
Upon selecting the AUX CLOSE OUTPUT function, the
TDC-100 will begin moving the actuator to the previously
set position. It is not necessary to make an adjustment if
the unit has been previously set to the desired position.
AUX OPEN OUTPUT
The AUX OPEN OUTPUT function is used to set 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
position falls between the defined open position and the
Aux Open position, the Aux Open Output indicator will
flash. Additionally, the TDC-100 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.
Upon selecting the AUX OPEN OUTPUT function, the
TDC-100 will begin moving the actuator to the previously
set position. It is not necessary to make an adjustment if
the unit has been previously set to the desired position.
COMAND TYPE
The COMMAND TYPE function is used to configure 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 COMMAND 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
When using 1-5V, 2-10V, 4-20mA, or a Digital input type
for the command signal, the TDC-100 will detect 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
connected backwards. An out of range condition is
detected whenever the input becomes greater than 5.25V
(for 1-5V input), 10.5V (for 2-10V input) or 21mA. If the
TDC-100 detects a loss of the command signal, a fault will
be indicated (see FAULT INDICATORS), and the actuator
will be moved to one of three preset positions: the open
position, the closed position, or the position last attained
prior to losing the command signal. The LOSS OF
COMMAND function is used to set the desired default
position.
When the LOSS OF COMMAND function is selected, the
adjust buttons are used to set the default position. The
TDC-100 indicates the selected default setting by flashing
the Open function indicator for the open default position,
or it will flash the Close function indicator for the closed
default position. When neither indicator is on, then the
"last position" default is selected.
When a 0-5V or 0-10V command signal is used, a loss of
command signal cannot be detected. Therefore, if the
unit is configured for a 0-5V or 0-10V command signal
(see COMMAND INPUT), the MODE button will not select
the LOSS OF COMMAND function. However, the TDC-
100 can detect when a 0-5V or 0-10V command signal is
out of range (i.e., greater than 5.25V or greater than
10.5V) or connected backwards. When an out of range
condition is detected for a 0-5V or 0-10V input, the motor
is turned off (leaving the actuator in its “last position”) and
a fault will be indicated (see FAULT INDICATORS).


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
7 07/24/20
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POSITION OUT CAL
The POSITION OUT CAL function is used to calibrate an
optional feedback transmitter output. An appropriate
transmitter option module is required to use this feature.
When the POSITION OUT CAL function is first selected
(by pressing the MODE button while in the LOSS OF
COMMAND function), the CLOSE indicator will flash, and
the voltage or current associated with the closed position
will appear at the option module output. If desired, the
output can be adjusted (using the adjust buttons) to any
value from 0 to 10V (for a voltage output) or 4 to 20mA
(for a current output). The new setting is saved when the
MODE button is pressed.
Pressing the MODE button again will leave the unit in the
POSITION OUT CAL function except that the OPEN
indicator will flash, and the output voltage or current
associated with the open position will appear at the option
module output. Like the closed setting, the output can be
adjusted to any voltage (from 0 to 10V) or current (from 4
to 20mA), and the new setting is then associated with the
open position.
FAULT INDICATORS
The TDC-100 detects various fault conditions that
prohibit the unit from controlling the actuator. A
combination of the three Fault indicators (red, yellow, and
green) will turn on or flash to indicate a specific detected
fault. If an appropriate relay option module is installed, the
Fault relay output on the option module will also turn off
(indicating a fault) when any of the Fault indicators turn on
or flash. A communications option module can read the
specific condition(s) causing the fault. Note that a fault
condition DOES NOT disable the motor outputs when
manually controlling the actuator with the adjust buttons;
while useful for troubleshooting, care should be exercised
when operating the motor under a fault condition. The
OVERRIDE mode can also operate the motor when a
fault condition exists - see OVERRIDE MODE for details.
Note that the indicators may not indicate all the fault
conditions that may exist. This means that when the
indicated fault is corrected, the unit may display another
fault that has not been corrected. The following table
provides a summary of the Fault indicators which is
followed by a description of each fault.
RED
YEL
GRN
FAULT
Flash Flash OFF Motor 1 No Motion (Stall)
Flash OFF Flash Motor 2 No Motion (Stall)
Flash Flash Flash Double No Motion (Stall)
OFF OFF Flash Feedback Alarm
OFF Flash OFF Loss of Command
OFF ON OFF Command Out of Range
OFF Flash Flash Feedback Alarm and
Loss of Command
OFF ON Flash Feedback Alarm and
Command Out of Range
Motor 1 No Motion (Stall) - A fault condition is detected
when no actuator motion is detected while the Motor 1
output is turned on. The fault condition will disable the
Motor 1 output only, and the fault is cleared when the
TDC-100 detects a motion greater than 1.5 in either
direction. The fault can be cleared if 1) the command
signal commands a Motor 2 operation, 2) manual
operation with the adjust buttons results in a motion
greater than 1.5, or 3) a mechanical manual override
forces the 1.5 motion, provided the mechanical motion is
monitored by the feedback pot.
Motor 2 No Motion (Stall) - A fault is detected when no
actuator motion is detected while the Motor 2 output is
turned on. The fault can be cleared in the same manner
as a Motor 1 Stall (see above).
Double No Motion (Stall) - If the TDC-100 detects no
actuator motion in either direction, both motor outputs will
be disabled. The command signal cannot clear this
condition; only manual operation or a mechanical override
can clear the fault. Alternatively, the TDC-100 can be
powered off and then on to temporarily clear the fault;
however, this practice should be avoided without
permanently correcting the cause of such a fault.
Feedback Alarm - A fault condition is detected whenever
the feedback signal is out of range (that is, less than 5%
of the potentiometer value or more than 95% of the
potentiometer value), or when any of the potentiometer
connections are broken. Normal operation resumes when
the potentiometer is reconnected or back in range.
Loss of Command - If the command signal is
disconnected, the fault indicator will remain on until the
signal is reconnected. See LOSS OF COMMAND for
details.
Command Out of Range – If the command signal goes
out of range, the fault indication will remain on until the
signal is back in range. See LOSS OF COMMAND for
details.


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
8 07/24/20
www.atcontrols.com IOM08032 REVISION 01
STALL DETECTION FEATURE
The Stall Detection feature of the TDC-100 (see FAULT
INDICATORS) essentially performs a similar function as
commonly used torque switches; however, the
differences should be considered before eliminating the
torque switches. The TDC-100 feature does not measure
torque, but rather motion; if the load is sensitive to
excessive torque, the torque switches may be desirable.
Since common torque switches are mechanical devices,
they can provide a fail safe feature in the event of
electrical failures (such as shorted wires or damage to the
TDC-100).
The Stall Detection feature is useful for detecting when
any of the motor wires become disconnected. However,
limit switches employed in actuators essentially
disconnect one of the motor windings. The TDC-100 will
detect this as a motor stall. To avoid this condition, the
limit switches must be set outside of the operating range
set by the CLOSE and OPEN functions.
ELECTRONIC BRAKE FEATURE
The Electronic Brake feature of the TDC-100 provides
highly reliable and accurate braking of the motor, and it is
a key element in achieving high resolution. A mechanical
brake can still be implemented without interfering with the
TDC-100 operation. Mechanical brakes can be useful for
providing a holding brake in the event power to the
actuator is lost.
Since the Electronic Brake feature provides the primary
braking of the motor, the life of a mechanical brake is
dramatically extended. Additonally, the Adaptive
Control feature of the TDC-100 automatically
compensates for changes in a mechanical brake's
performance due to temperature or age.
Note that the actuator's limit switches should be set
outside of the operating range set by the CLOSE and
OPEN functions. The Electronic Brake feature degrades
in performance if a limit switch is engaged. Limit switches
exhibit wide variations, and the TDC-100 can position the
actuator more precisely at closed and open than the limit
switches. A limit switch serves better as a fail safe device
to protect against electrical failures in the actuator.
DUTY CYCLE CONTROL FEATURE
The Duty Cycle Control feature of the TDC-100 allows
actuators rated at 25% duty or more to be safely used in
automated valve applications. The TDC-100 accurately
monitors the relative heating of the motor and
automatically duty cycles the unit at a safe level when a
process becomes unstable, or if a control loop is not
properly set. While the thermal switch in the motor
protects the motor from overheating, thermal switches
can shutdown the actuator for ten minutes or more.
Further, typical thermal switches do not activate until
temperatures inside the actuator become too high for
other components in the actuator.
The Duty Cycle Control feature allows continuous
operation of the motor until it detects an excess heat
buildup in the motor (usually well below the limit of the
thermal switch). At that time, duty cycle operation is
automatically enabled and continues until the motor cools
enough to resume continuous operation. The duty cycle
period is approximately 2 seconds with an on time that
automatically various depending on the heating of the
motor. While this operation slows down the actuator's
operation, it does not impact the resolution performance
of the TDC-100, and it prevents disruption of a process
due to a thermal switch shutdown.


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
9 07/24/20
www.atcontrols.com IOM08032 REVISION 01
OPTION MODULES
Various option modules can be plugged into the TDC-100 option module connector, J3. Option modules provide
additional features such as position feedback signals, auxiliary switch outputs, or digital communications. Contact the
factory for the latest available modules. Refer to the diagram below for instructions on installing an option module


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
10 07/24/20
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SPECIFICATIONS
POWER REQUIREMENTS
TDC-100: 117VAC 10%, 50/60 Hz
TDC-100A: 234VAC 10%, 50/60 Hz
TDC-100B: 24VAC 10%, 50/60 Hz
12 VA typical (not including output load)
Fuse Type: 6.3A TR5 Time Delay (replaceable)
COMMAND SIGNAL INPUT
Input Impedance
20K ohms (VOLTAGE CMD (+) Input)
251 ohms 1% (4-20 mA CMD (+) Input)
Loss of Command threshold
< 0.75V (1-5 VDC input)
< 1.5V (2-10 VDC input)
< 3mA (4-20mA input)
Command Out of Range threshold
> 5.25V (0-5 VDC, 1-5 VDC input)
> 10.5V (0-10 VDC, 2-10 VDC input)
> 21mA (4-20mA input)
FEEDBACK SIGNAL INPUT
Input Voltage: 0 to 2.5 VDC
External Feedback Potentiometer: 1K ohm
POWER SUPPLY OUTPUTS
+15V OUT (J2-8): 100mA maximum (not including option module)
+5V OUT (J2-7): 20mA maximum
NOTE: Do not connect these outputs to other power supplies.
AC MOTOR OUTPUTS
Off-state Leakage Current: <15mA
Maximum Load Current @ 60C: 5A
ENVIRONMENTAL
Operating Temperature Range: 0 C to 60 C
Storage Temperature Range: -40 C to 85 C
Relative Humidity Range: 0 to 90 % (noncondensing)


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
11 07/24/20
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WIRING DIAGRAMS
Input Signal Configurations


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
12 07/24/20
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WIRING DIAGRAMS
Special Applications


TDC-100 Series
AC Digital High-Resolution Controller
Installation & Maintenance Manual
13 07/24/20
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WIRING DIAGRAMS
Special Applications (continued)


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AC Digital High-Resolution Controller
Installation & Maintenance Manual
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TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSES
REMEDIES
No response from unit
(All lights are off)
No power.
Excessive voltage applied to unit.
Blown or missing fuse.
Check power source.
Replace unit.
Replace with appropriate fuse; see
“Specifications in manual.
No response from unit, and no response from
adjust (▲ and ▼) or MODE buttons.
(MANUAL/FB POT CAL light is lit solid)
Jumper wire on J7 terminal block is missing.
Auto/Manual station is improperly wired.
Install jumper wire on J7 terminal block.
Check wiring on Auto/Manual station; see
“Override Mode” in manual.
Actuator rotates valve backwards
Actuator or valve is mounted incorrectly on
coupling.
Actuator needs to be reverse acting.
Remount actuator as necessary.
Refer to “Close” and “Open” modes in manual.
Actuator does not respond to input signal (all
FAULT indicators off).
Closed and open positions are set to the same
position.
Set close and open settings; refer to “Close”
and “Open” modes in manual.
Motor 1 or 2 No Motion (Stall) FAULT indicators
flash after actuator reaches fully closed or open
position.
Closed or open limit switches set inside the
operating range.
Torque switches trip due to mechanical end
stops set inside the operating range.
Adjust limit switch cams; refer to “Close” and
“Open” modes in manual.
Adjust mechanical end stops; refer to “Close”
and “Open” modes in manual.
AUX CLOSE OUTPUT or AUX OPEN OUTPUT
indicators flash.
If an OTR-100 or OTR-101 option module is not
installed, no remedy is r
equired.
Actuator position is near close or open.
If and OTR-100 or OTR-101 option module is
installed, set Aux Close and Aux Open
positions; refer to “Aux Close Output” and “Aux
Open Output” modes in manual.
Actuator hunts for position.
Sloppy gear tooth engagement.
No motor brake or brake slipping.
Unstable command input signal from PID
control loop.
Adjust feedback potentiometer gears for tight
engagement.
Install or repair motor brake.
Adjust PID parameters for stable command
signal.
Triac output failure
(Motor buzzes and overheats).
Perform appropriate remedy, then replace the
unit.
Exposure to water from conduit entrance.
Exposure to water from unsealed actuator
housing.
Exposure to moisture from condensate.
Corrosion from exposure to salts or acids.
External power applied to motor connections as
J1-1 or J1-3.
Motor capacitor is defective or has incorrect
voltage rating.
Lightning or power surge.
Install drip loop at conduit entrance.
Inspect and/or replace actuator housing gasket;
use actuator with proper sealing.
Use heater and thermostat and/or desicant
packets.
Use corrosion inhibitors and desicant packets.
Remove connector J1 prior to applying external
power.
Replace motor capacitor.
Replace unit.
A-T Controls product, when properly selected, is designed to perform its intended function safely during its useful life. However, the purchaser or user of A-T Controls products
should be aware that A-T Controls products might be used in numerous applications under a wide variety of industrial service conditions. Although A-T Controls can provide
general guidelines, it cannot provide specific data and warnings for all possible applications. The purchaser / user must therefore assume the ultimate responsibility for the
proper sizing and selection, installation, operation, and maintenance of A-T Controls products. The user should read and understand the installation operation maintenance
(IOM) instructions included with the product and train its employees and contractors in the safe use of A-T Controls products in connection with the specific application.
While the information and specifications contained in this literature are believed to be accurate, they are supplied for informative purposes only. Because A-T Controls is
continually improving and upgrading its product design, the specifications, dimensions and information contained in this literature are subject to change without notice. Should
any question arise concerning these specifications, the purchaser/user should contact A-T Controls.
For product specifications go to http://download.a-tcontrols.com/
A-T Controls, Inc. • 9955 International Boulevard, Cincinnati, OH 45246 • Phone: [phone] • Fax: [phone] • www.atcontrols.com